Sea weather in Derry (Londonderry) in Northern Ireland All the beach weather in Derry (Londonderry)
All the essential weather information for enjoying the beach in Derry (Londonderry) in Northern Ireland, for swimming, tanning or water sports! Our sea weather data is reliable, easy to read and updated every day.
Weather: When should you go to the beach in Derry (Londonderry) over the next 7 days?
Discover the best moment to go to the beach in Derry (Londonderry) in Northern Ireland this week to enjoy the best weather and calmest sea possible. Our opinion is based on reliable sea weather forecasts in Derry (Londonderry). You can see full forecasts by clicking on the day you want to see in the table below.
| Date | Outside temp. | Max wind | Our opinion | Details |
|---|---|---|---|---|
| Monday 15 December 2025 | 40°F to 45°F | 6.8mph | discouraged | all the sea weather |
| Tuesday 16 December 2025 | 36°F to 41°F | 11.2mph | discouraged | all the sea weather |
| Wednesday 17 December 2025 | 41°F to 49°F | 14.3mph | discouraged | all the sea weather |
| Thursday 18 December 2025 | 43°F to 47°F | 31.7mph | not recommended | all the sea weather |
| Friday 19 December 2025 | 41°F to 45°F | 22.4mph | discouraged | all the sea weather |
| Saturday 20 December 2025 | 41°F to 50°F | 22.4mph | discouraged | all the sea weather |
| Sunday 21 December 2025 | 43°F to 45°F | 5.6mph | discouraged | all the sea weather |
Sea Weather: Your daily and hourly sea weather in Derry (Londonderry)
Sea weather on Monday 15 December 2025
On Monday 15 December 2025, the sun will rise at 08:48 and will set at 16:01 on the beach(es) of Derry (Londonderry). The outside temperature will be a high of 45°F t and a low of 40°F. There will be little to no precipitation today, so unless you go swimming, you can enjoy the beach and stay dry! The sea will be generally calm, with a wind speed of up to 10.6mph km/h (with gusts up to 17.4mph). Wave height will be up to 4.3ft today.
| 0:00 | 3:00 | 6:00 | 9:00 | 12:00 | 15:00 | 18:00 | 21:00 | |
| Weather | ||||||||
| Sky condition |  |  | |  | | | | |
| Outside temperature | 7°C (45°F) | 7°C (45°F) | 6°C (44°F) | 6°C (43°F) | 6°C (43°F) | 6°C (42°F) | 5°C (40°F) | 5°C (42°F) |
| Perceived temperature | 4°C (40°F) | 4°C (40°F) | 3°C (38°F) | 3°C (38°F) | 4°C (39°F) | 4°C (38°F) | 2°C (36°F) | 3°C (37°F) |
| Precipitation | 0in | 0in | 0in | 0in | 0in | 0in | 0in | 0in |
| Humidity | 83% | 78% | 80% | 78% | 78% | 81% | 86% | 87% |
| Barometric pressure | 999 hPa | 1000 hPa | 1000 hPa | 1001 hPa | 1002 hPa | 1002 hPa | 1003 hPa | 1004 hPa |
| Cloud cover | 56% | 100% | 5% | 14% | 8% | 9% | 11% | 9% |
| Heat index | 7°C (45°F) | 7°C (45°F) | 6°C (44°F) | 6°C (43°F) | 6°C (43°F) | 6°C (42°F) | 5°C (40°F) | 5°C (42°F) |
| Dew point | 5°C (40°F) | 3°C (38°F) | 3°C (38°F) | 3°C (37°F) | 3°C (37°F) | 3°C (37°F) | 3°C (37°F) | 3°C (38°F) |
| Wind | ||||||||
| Speed | 17km/h (11mph) | 14km/h (9mph) | 17km/h (11mph) | 17km/h (10mph) | 13km/h (8mph) | 10km/h (6mph) | 10km/h (6mph) | 11km/h (7mph) |
| Gusts | 25km/h (16mph) | 23km/h (14mph) | 28km/h (18mph) | 28km/h (18mph) | 21km/h (13mph) | 19km/h (12mph) | 19km/h (12mph) | 19km/h (12mph) |
| Direction | 244° WSW | 228° SW | 195° SSW | 196° SSW | 199° SSW | 211° SSW | 205° SSW | 215° SW |
| Wind chill | 4°C (40°F) | 4°C (40°F) | 3°C (38°F) | 3°C (38°F) | 4°C (39°F) | 4°C (38°F) | 2°C (36°F) | 3°C (37°F) |
| Waves | ||||||||
| Height | 1.0m (3.4ft) | 1.0m (3.3ft) | 1.0m (3.2ft) | 1.0m (3.4ft) | 1.1m (3.7ft) | 1.2m (4.0ft) | 1.3m (4.3ft) | 1.3m (4.3ft) |
| Direction | 300° WNW | 300° WNW | 308° NW | 307° NW | 309° NW | 307° NW | 308° NW | 309° NW |
| Period | 7.6 sec. | 13.7 sec. | 15.4 sec. | 15.5 sec. | 17.0 sec. | 16.4 sec. | 16.3 sec. | 15.8 sec. |
| Significant height | 1.0m (3.3ft) | 0.8m (2.6ft) | 0.9m (3ft) | 1.3m (4.3ft) | 1.4m (4.6ft) | 0.3m (1ft) | 0.3m (1ft) | 0.3m (1ft) |
| Sea water temperature | ||||||||
| Water temperature | 11°C (51°F) | 11°C (51°F) | 11°C (51°F) | 11°C (51°F) | 11°C (51°F) | 11°C (51°F) | 11°C (51°F) | 11°C (51°F) |
Sea weather on Tuesday 16 December 2025
On Tuesday 16 December 2025, the sun will rise at 08:49 and will set at 16:01 on the beach(es) of Derry (Londonderry). The outside temperature will be a high of 41°F t and a low of 36°F. There will be little to no precipitation today, so unless you go swimming, you can enjoy the beach and stay dry! The sea will be generally calm, with a wind speed of up to 11.2mph km/h (with gusts up to 21.1mph). Wave height will be up to 3.9ft today.
| 0:00 | 3:00 | 6:00 | 9:00 | 12:00 | 15:00 | 18:00 | 21:00 | |
| Weather | ||||||||
| Sky condition | | | | |  | | | |
| Outside temperature | 5°C (42°F) | 5°C (41°F) | 4°C (40°F) | 4°C (40°F) | 3°C (38°F) | 5°C (40°F) | 3°C (38°F) | 4°C (40°F) |
| Perceived temperature | 3°C (37°F) | 2°C (36°F) | 1°C (34°F) | 1°C (33°F) | -0°C (31°F) | 1°C (34°F) | -1°C (30°F) | 1°C (33°F) |
| Precipitation | 0in | 0in | 0in | 0in | 0in | 0in | 0in | 0in |
| Humidity | 85% | 86% | 88% | 86% | 83% | 80% | 84% | 83% |
| Barometric pressure | 1005 hPa | 1006 hPa | 1008 hPa | 1010 hPa | 1011 hPa | 1012 hPa | 1013 hPa | 1013 hPa |
| Cloud cover | 30% | 6% | 7% | 9% | 0% | 5% | 4% | 4% |
| Heat index | 5°C (42°F) | 5°C (41°F) | 4°C (40°F) | 4°C (40°F) | 3°C (38°F) | 5°C (40°F) | 3°C (38°F) | 4°C (40°F) |
| Dew point | 3°C (37°F) | 3°C (37°F) | 3°C (37°F) | 2°C (36°F) | 1°C (33°F) | 1°C (34°F) | 1°C (33°F) | 2°C (35°F) |
| Wind | ||||||||
| Speed | 12km/h (7mph) | 13km/h (8mph) | 15km/h (9mph) | 15km/h (9mph) | 15km/h (10mph) | 17km/h (10mph) | 17km/h (11mph) | 18km/h (11mph) |
| Gusts | 20km/h (12mph) | 23km/h (14mph) | 27km/h (17mph) | 28km/h (17mph) | 32km/h (20mph) | 32km/h (20mph) | 20km/h (12mph) | 34km/h (21mph) |
| Direction | 223° SW | 221° SW | 225° SW | 218° SW | 212° SSW | 218° SW | 201° SSW | 186° S |
| Wind chill | 3°C (37°F) | 2°C (36°F) | 1°C (34°F) | 1°C (33°F) | -0°C (31°F) | 1°C (34°F) | -1°C (30°F) | 1°C (33°F) |
| Waves | ||||||||
| Height | 1.2m (4.1ft) | 1.2m (3.8ft) | 1.1m (3.5ft) | 1.0m (3.3ft) | 1.0m (3.2ft) | 1.1m (3.5ft) | 1.0m (3.4ft) | 1.0m (3.2ft) |
| Direction | 306° NW | 305° NW | 303° WNW | 302° WNW | 303° WNW | 305° NW | 304° NW | 303° WNW |
| Period | 14.9 sec. | 14.8 sec. | 15.1 sec. | 15.0 sec. | 14.7 sec. | 14.5 sec. | 14.4 sec. | 14.4 sec. |
| Significant height | 0.3m (1ft) | 0.3m (1ft) | 0.4m (1.3ft) | 1.4m (4.6ft) | 1.3m (4.3ft) | 1.4m (4.6ft) | 1.4m (4.6ft) | 1.3m (4.3ft) |
| Sea water temperature | ||||||||
| Water temperature | 11°C (51°F) | 11°C (51°F) | 11°C (51°F) | 11°C (51°F) | 11°C (51°F) | 11°C (51°F) | 11°C (51°F) | 11°C (51°F) |
Sea weather on Wednesday 17 December 2025
On Wednesday 17 December 2025, the sun will rise at 08:50 and will set at 16:01 on the beach(es) of Derry (Londonderry). The outside temperature will be a high of 49°F t and a low of 41°F. There will be little to no precipitation today, so unless you go swimming, you can enjoy the beach and stay dry! The sea will be generally calm, with a wind speed of up to 24.2mph km/h (with gusts up to 34.2mph). Wave height will be up to 4.3ft today.
| 0:00 | 3:00 | 6:00 | 9:00 | 12:00 | 15:00 | 18:00 | 21:00 | |
| Weather | ||||||||
| Sky condition | | |  |  | | | | |
| Outside temperature | 5°C (41°F) | 6°C (43°F) | 7°C (44°F) | 8°C (46°F) | 9°C (47°F) | 9°C (48°F) | 8°C (46°F) | 8°C (46°F) |
| Perceived temperature | 0°C (33°F) | 1°C (35°F) | 2°C (35°F) | 3°C (38°F) | 4°C (40°F) | 6°C (43°F) | 6°C (43°F) | 4°C (40°F) |
| Precipitation | 0in | 0in | 0in | 0in | 0in | 0in | 0in | 0in |
| Humidity | 80% | 76% | 85% | 87% | 90% | 91% | 90% | 86% |
| Barometric pressure | 1012 hPa | 1009 hPa | 1006 hPa | 1005 hPa | 1005 hPa | 1004 hPa | 1004 hPa | 1005 hPa |
| Cloud cover | 89% | 100% | 100% | 100% | 100% | 97% | 100% | 100% |
| Heat index | 5°C (41°F) | 6°C (43°F) | 7°C (44°F) | 8°C (46°F) | 9°C (47°F) | 9°C (48°F) | 8°C (46°F) | 8°C (46°F) |
| Dew point | 2°C (35°F) | 2°C (36°F) | 4°C (40°F) | 6°C (42°F) | 7°C (44°F) | 7°C (45°F) | 7°C (44°F) | 6°C (42°F) |
| Wind | ||||||||
| Speed | 26km/h (16mph) | 31km/h (19mph) | 37km/h (23mph) | 39km/h (24mph) | 33km/h (21mph) | 16km/h (10mph) | 9km/h (6mph) | 23km/h (14mph) |
| Gusts | 41km/h (26mph) | 45km/h (28mph) | 54km/h (33mph) | 55km/h (34mph) | 50km/h (31mph) | 26km/h (16mph) | 16km/h (10mph) | 34km/h (21mph) |
| Direction | 186° S | 183° S | 186° S | 190° S | 193° SSW | 202° SSW | 196° SSW | 253° WSW |
| Wind chill | 0°C (33°F) | 1°C (35°F) | 2°C (35°F) | 3°C (38°F) | 4°C (40°F) | 6°C (43°F) | 6°C (43°F) | 4°C (40°F) |
| Waves | ||||||||
| Height | 0.9m (3.1ft) | 0.9m (2.9ft) | 1.1m (3.5ft) | 1.3m (4.3ft) | 1.2m (3.8ft) | 0.8m (2.6ft) | 0.6m (2.1ft) | 0.7m (2.3ft) |
| Direction | 303° WNW | 301° WNW | 302° WNW | 301° WNW | 298° WNW | 297° WNW | 298° WNW | 298° WNW |
| Period | 14.2 sec. | 13.9 sec. | 13.3 sec. | 13.0 sec. | 13.1 sec. | 13.1 sec. | 12.9 sec. | 12.7 sec. |
| Significant height | 1.2m (3.9ft) | 1.2m (3.9ft) | 1.8m (5.9ft) | 1.9m (6.2ft) | 1.3m (4.3ft) | 0.7m (2.3ft) | 0.8m (2.6ft) | 0.8m (2.6ft) |
| Sea water temperature | ||||||||
| Water temperature | 11°C (51°F) | 11°C (51°F) | 11°C (51°F) | 11°C (51°F) | 11°C (51°F) | 11°C (51°F) | 11°C (51°F) | 11°C (51°F) |
Sea weather on Thursday 18 December 2025
On Thursday 18 December 2025, the sun will rise at 08:51 and will set at 16:01 on the beach(es) of Derry (Londonderry). The outside temperature will be a high of 47°F t and a low of 43°F. Precipitation is in the forecast (0.2in throughout the day): choose the right time to go to the beach and dodge the raindrops. Be careful, the sea will be generally rough with a wind speed of up to 31.7mph km/h (with gusts up to 42.9mph). Wave height will be up to 8.2ft today.
| 0:00 | 3:00 | 6:00 | 9:00 | 12:00 | 15:00 | 18:00 | 21:00 | |
| Weather | ||||||||
| Sky condition | | | |  |  | | | |
| Outside temperature | 7°C (45°F) | 6°C (43°F) | 6°C (43°F) | 7°C (44°F) | 8°C (46°F) | 7°C (45°F) | 7°C (44°F) | 6°C (43°F) |
| Perceived temperature | 4°C (39°F) | 3°C (38°F) | 3°C (38°F) | 4°C (38°F) | 4°C (40°F) | 4°C (39°F) | 4°C (38°F) | 0°C (32°F) |
| Precipitation | 0in | 0in | 0in | 0in | 0.1in | 0.1in | 0in | 0in |
| Humidity | 81% | 89% | 91% | 88% | 95% | 95% | 93% | 90% |
| Barometric pressure | 1006 hPa | 1006 hPa | 1004 hPa | 1001 hPa | 995 hPa | 989 hPa | 988 hPa | 992 hPa |
| Cloud cover | 21% | 20% | 25% | 78% | 100% | 100% | 100% | 100% |
| Heat index | 7°C (45°F) | 6°C (43°F) | 6°C (43°F) | 7°C (44°F) | 8°C (46°F) | 7°C (45°F) | 7°C (44°F) | 6°C (43°F) |
| Dew point | 4°C (39°F) | 5°C (40°F) | 5°C (40°F) | 5°C (40°F) | 7°C (44°F) | 7°C (44°F) | 6°C (42°F) | 5°C (40°F) |
| Wind | ||||||||
| Speed | 21km/h (13mph) | 15km/h (9mph) | 14km/h (9mph) | 15km/h (10mph) | 18km/h (11mph) | 19km/h (12mph) | 18km/h (11mph) | 51km/h (32mph) |
| Gusts | 33km/h (20mph) | 25km/h (16mph) | 24km/h (15mph) | 25km/h (15mph) | 28km/h (17mph) | 29km/h (18mph) | 28km/h (17mph) | 69km/h (43mph) |
| Direction | 222° SW | 180° S | 153° SSE | 144° SE | 101° E | 345° NNW | 281° W | 306° NW |
| Wind chill | 4°C (39°F) | 3°C (38°F) | 3°C (38°F) | 4°C (38°F) | 4°C (40°F) | 4°C (39°F) | 4°C (38°F) | 0°C (32°F) |
| Waves | ||||||||
| Height | 1.2m (4.1ft) | 2.3m (7.4ft) | 2.5m (8.2ft) | 2.4m (8.0ft) | 2.3m (7.7ft) | 2.3m (7.7ft) | 2.1m (7.0ft) | 2.0m (6.5ft) |
| Direction | 311° NW | 308° NW | 308° NW | 307° NW | 307° NW | 308° NW | 308° NW | 307° NW |
| Period | 15.8 sec. | 20.1 sec. | 20.1 sec. | 20.2 sec. | 19.4 sec. | 19.2 sec. | 18.9 sec. | 18.1 sec. |
| Significant height | 1.1m (3.6ft) | 0.7m (2.3ft) | 0.3m (1ft) | 0.5m (1.6ft) | 0.9m (3ft) | 0.6m (2ft) | 0.6m (2ft) | 1.0m (3.3ft) |
| Sea water temperature | ||||||||
| Water temperature | 11°C (51°F) | 11°C (51°F) | 11°C (51°F) | 11°C (51°F) | 11°C (51°F) | 11°C (51°F) | 11°C (51°F) | 11°C (51°F) |
Sea weather on Friday 19 December 2025
On Friday 19 December 2025, the sun will rise at 08:51 and will set at 16:02 on the beach(es) of Derry (Londonderry). The outside temperature will be a high of 45°F t and a low of 41°F. There will be little to no precipitation today, so unless you go swimming, you can enjoy the beach and stay dry! The sea will be generally calm, with a wind speed of up to 22.4mph km/h (with gusts up to 33.6mph). Wave height will be up to 6.2ft today.
| 0:00 | 3:00 | 6:00 | 9:00 | 12:00 | 15:00 | 18:00 | 21:00 | |
| Weather | ||||||||
| Sky condition | | | | | | | | |
| Outside temperature | 7°C (44°F) | 6°C (42°F) | 5°C (41°F) | 6°C (43°F) | 6°C (43°F) | 6°C (43°F) | 6°C (43°F) | 7°C (45°F) |
| Perceived temperature | 2°C (35°F) | 1°C (34°F) | 1°C (33°F) | 1°C (35°F) | 1°C (34°F) | 1°C (34°F) | 1°C (34°F) | 2°C (36°F) |
| Precipitation | 0in | 0in | 0in | 0in | 0in | 0in | 0in | 0in |
| Humidity | 72% | 68% | 76% | 80% | 77% | 78% | 81% | 83% |
| Barometric pressure | 996 hPa | 999 hPa | 1002 hPa | 1004 hPa | 1006 hPa | 1006 hPa | 1006 hPa | 1004 hPa |
| Cloud cover | 100% | 75% | 56% | 49% | 27% | 70% | 65% | 100% |
| Heat index | 7°C (44°F) | 6°C (42°F) | 5°C (41°F) | 6°C (43°F) | 6°C (43°F) | 6°C (43°F) | 6°C (43°F) | 7°C (45°F) |
| Dew point | 2°C (35°F) | 0°C (33°F) | 1°C (34°F) | 3°C (37°F) | 2°C (36°F) | 3°C (37°F) | 3°C (38°F) | 4°C (40°F) |
| Wind | ||||||||
| Speed | 31km/h (19mph) | 28km/h (17mph) | 22km/h (14mph) | 28km/h (17mph) | 30km/h (18mph) | 33km/h (21mph) | 36km/h (23mph) | 36km/h (23mph) |
| Gusts | 46km/h (29mph) | 44km/h (27mph) | 36km/h (22mph) | 42km/h (26mph) | 45km/h (28mph) | 51km/h (32mph) | 42km/h (26mph) | 54km/h (33mph) |
| Direction | 277° W | 252° WSW | 228° SW | 225° SW | 221° SW | 210° SSW | 198° SSW | 190° S |
| Wind chill | 2°C (35°F) | 1°C (34°F) | 1°C (33°F) | 1°C (35°F) | 1°C (34°F) | 1°C (34°F) | 1°C (34°F) | 2°C (36°F) |
| Waves | ||||||||
| Height | 1.9m (6.2ft) | 1.7m (5.7ft) | 1.9m (6.2ft) | 1.8m (5.8ft) | 1.5m (5.1ft) | 1.4m (4.5ft) | 1.2m (4.1ft) | 1.2m (3.9ft) |
| Direction | 308° NW | 309° NW | 308° NW | 309° NW | 310° NW | 308° NW | 308° NW | 309° NW |
| Period | 17.7 sec. | 17.4 sec. | 16.2 sec. | 16.0 sec. | 15.7 sec. | 14.9 sec. | 14.6 sec. | 14.4 sec. |
| Significant height | 1.0m (3.3ft) | 0.8m (2.6ft) | 1.5m (4.9ft) | 0.8m (2.6ft) | 0.7m (2.3ft) | 0.7m (2.3ft) | 0.7m (2.3ft) | 1.5m (4.9ft) |
| Sea water temperature | ||||||||
| Water temperature | 11°C (51°F) | 11°C (51°F) | 11°C (51°F) | 11°C (51°F) | 11°C (51°F) | 11°C (51°F) | 11°C (51°F) | 11°C (51°F) |
Sea weather on Saturday 20 December 2025
On Saturday 20 December 2025, the sun will rise at 08:52 and will set at 16:02 on the beach(es) of Derry (Londonderry). The outside temperature will be a high of 50°F t and a low of 41°F. Precipitation is in the forecast (0.1in throughout the day): choose the right time to go to the beach and dodge the raindrops. The sea will be generally calm, with a wind speed of up to 24.2mph km/h (with gusts up to 33.6mph). Wave height will be up to 4.3ft today.
| 0:00 | 3:00 | 6:00 | 9:00 | 12:00 | 15:00 | 18:00 | 21:00 | |
| Weather | ||||||||
| Sky condition | | | |  | | | | |
| Outside temperature | 8°C (47°F) | 10°C (49°F) | 10°C (49°F) | 5°C (41°F) | 5°C (41°F) | 6°C (42°F) | 5°C (41°F) | 6°C (42°F) |
| Perceived temperature | 4°C (39°F) | 6°C (42°F) | 5°C (42°F) | 1°C (33°F) | 1°C (34°F) | 1°C (33°F) | -1°C (31°F) | 1°C (33°F) |
| Precipitation | 0in | 0in | 0in | 0.1in | 0in | 0in | 0in | 0in |
| Humidity | 85% | 82% | 79% | 94% | 85% | 79% | 82% | 83% |
| Barometric pressure | 1001 hPa | 998 hPa | 995 hPa | 995 hPa | 996 hPa | 995 hPa | 995 hPa | 995 hPa |
| Cloud cover | 100% | 100% | 100% | 100% | 100% | 47% | 51% | 90% |
| Heat index | 8°C (47°F) | 10°C (49°F) | 10°C (49°F) | 5°C (41°F) | 5°C (41°F) | 6°C (42°F) | 5°C (41°F) | 6°C (42°F) |
| Dew point | 6°C (42°F) | 7°C (44°F) | 6°C (43°F) | 4°C (40°F) | 3°C (37°F) | 2°C (36°F) | 2°C (36°F) | 3°C (38°F) |
| Wind | ||||||||
| Speed | 34km/h (21mph) | 35km/h (21mph) | 37km/h (23mph) | 24km/h (15mph) | 20km/h (12mph) | 35km/h (22mph) | 39km/h (24mph) | 36km/h (23mph) |
| Gusts | 49km/h (30mph) | 52km/h (32mph) | 54km/h (34mph) | 31km/h (19mph) | 29km/h (18mph) | 40km/h (25mph) | 42km/h (26mph) | 52km/h (33mph) |
| Direction | 186° S | 187° S | 182° S | 267° W | 206° SSW | 202° SSW | 199° SSW | 199° SSW |
| Wind chill | 4°C (39°F) | 6°C (42°F) | 5°C (42°F) | 1°C (33°F) | 1°C (34°F) | 1°C (33°F) | -1°C (31°F) | 1°C (33°F) |
| Waves | ||||||||
| Height | 1.1m (3.7ft) | 1.1m (3.5ft) | 1.0m (3.3ft) | 1.0m (3.3ft) | 1.0m (3.3ft) | 1.1m (3.6ft) | 1.3m (4.2ft) | 1.2m (3.8ft) |
| Direction | 307° NW | 304° NW | 306° NW | 306° NW | 304° NW | 304° NW | 310° NW | 309° NW |
| Period | 14.2 sec. | 13.8 sec. | 13.3 sec. | 12.9 sec. | 12.4 sec. | 12.6 sec. | 13.3 sec. | 12.3 sec. |
| Significant height | 1.4m (4.6ft) | 1.4m (4.6ft) | 1.4m (4.6ft) | 1.5m (4.9ft) | 1.5m (4.9ft) | 0.7m (2.3ft) | 0.6m (2ft) | 0.6m (2ft) |
| Sea water temperature | ||||||||
| Water temperature | 11°C (51°F) | 11°C (51°F) | 11°C (51°F) | 11°C (51°F) | 11°C (51°F) | 11°C (51°F) | 11°C (51°F) | 11°C (51°F) |
Sea weather on Sunday 21 December 2025
On Sunday 21 December 2025, the sun will rise at 08:52 and will set at 16:02 on the beach(es) of Derry (Londonderry). The outside temperature will be a high of 45°F t and a low of 43°F. There will be little to no precipitation today, so unless you go swimming, you can enjoy the beach and stay dry! The sea will be generally calm, with a wind speed of up to 18mph km/h (with gusts up to 24.9mph). Wave height will be up to 9.2ft today.
| 0:00 | 3:00 | 6:00 | 9:00 | 12:00 | 15:00 | 18:00 | 21:00 | |
| Weather | ||||||||
| Sky condition | |  | | | | | | |
| Outside temperature | 6°C (43°F) | 6°C (44°F) | 6°C (43°F) | 6°C (43°F) | 6°C (43°F) | 7°C (45°F) | 6°C (42°F) | 7°C (44°F) |
| Perceived temperature | 1°C (34°F) | 2°C (36°F) | 3°C (38°F) | 4°C (40°F) | 4°C (39°F) | 4°C (39°F) | 5°C (41°F) | 5°C (41°F) |
| Precipitation | 0in | 0.1in | 0in | 0in | 0in | 0in | 0in | 0in |
| Humidity | 88% | 89% | 84% | 88% | 88% | 80% | 85% | 84% |
| Barometric pressure | 994 hPa | 994 hPa | 994 hPa | 997 hPa | 998 hPa | 999 hPa | 1001 hPa | 1004 hPa |
| Cloud cover | 99% | 100% | 100% | 33% | 89% | 58% | 100% | 100% |
| Heat index | 6°C (43°F) | 6°C (44°F) | 6°C (43°F) | 6°C (43°F) | 6°C (43°F) | 7°C (45°F) | 6°C (42°F) | 7°C (44°F) |
| Dew point | 4°C (39°F) | 5°C (40°F) | 4°C (39°F) | 4°C (40°F) | 5°C (40°F) | 4°C (39°F) | 3°C (38°F) | 4°C (39°F) |
| Wind | ||||||||
| Speed | 29km/h (18mph) | 26km/h (16mph) | 15km/h (9mph) | 8km/h (5mph) | 11km/h (7mph) | 19km/h (12mph) | 4km/h (3mph) | 9km/h (5mph) |
| Gusts | 40km/h (25mph) | 36km/h (23mph) | 23km/h (14mph) | 12km/h (8mph) | 17km/h (11mph) | 30km/h (19mph) | 8km/h (5mph) | 14km/h (9mph) |
| Direction | 189° S | 196° SSW | 168° SSE | 274° W | 228° SW | 291° WNW | 169° S | 46° NE |
| Wind chill | 1°C (34°F) | 2°C (36°F) | 3°C (38°F) | 4°C (40°F) | 4°C (39°F) | 4°C (39°F) | 5°C (41°F) | 5°C (41°F) |
| Waves | ||||||||
| Height | 1.3m (4.2ft) | 2.5m (8.1ft) | 2.7m (8.9ft) | 2.8m (9.1ft) | 2.5m (8.1ft) | 2.2m (7.2ft) | 2.0m (6.6ft) | 1.9m (6.1ft) |
| Direction | 305° NW | 314° NW | 327° NNW | 334° NNW | 345° NNW | 345° NNW | 346° NNW | 352° N |
| Period | 11.9 sec. | 11.9 sec. | 11.8 sec. | 11.4 sec. | 10.9 sec. | 11.9 sec. | 11.8 sec. | 11.5 sec. |
| Significant height | 1.0m (3.3ft) | 2.1m (6.9ft) | 2.0m (6.6ft) | 1.9m (6.2ft) | 1.8m (5.9ft) | 1.2m (3.9ft) | 1.1m (3.6ft) | 1.0m (3.3ft) |
| Sea water temperature | ||||||||
| Water temperature | 11°C (51°F) | 11°C (51°F) | 11°C (51°F) | 11°C (51°F) | 11°C (51°F) | 11°C (51°F) | 11°C (51°F) | 11°C (51°F) |