Sea weather in San Sebastian in Puerto Rico All the beach weather in San Sebastian
All the essential weather information for enjoying the beach in San Sebastian in Puerto Rico, 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 San Sebastian over the next 7 days?
Discover the best moment to go to the beach in San Sebastian in Puerto Rico this week to enjoy the best weather and calmest sea possible. Our opinion is based on reliable sea weather forecasts in San Sebastian. 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 | 72°F to 79°F | 3.7mph | recommended | all the sea weather |
| Tuesday 16 December 2025 | 74°F to 81°F | 5.6mph | recommended | all the sea weather |
| Wednesday 17 December 2025 | 74°F to 81°F | 11.8mph | discouraged | all the sea weather |
| Thursday 18 December 2025 | 74°F to 81°F | 14.3mph | discouraged | all the sea weather |
| Friday 19 December 2025 | 74°F to 79°F | 16.2mph | discouraged | all the sea weather |
| Saturday 20 December 2025 | 74°F to 77°F | 18mph | discouraged | all the sea weather |
| Sunday 21 December 2025 | 77°F to 81°F | 19.9mph | discouraged | all the sea weather |
Sea Weather: Your daily and hourly sea weather in San Sebastian
Sea weather on Monday 15 December 2025
On Monday 15 December 2025, the sun will rise at 06:53 and will set at 17:55 on the beach(es) of San Sebastian. The outside temperature will be a high of 79°F t and a low of 72°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 5.6mph km/h (with gusts up to 9.9mph). Wave height will be up to 3ft today.
| 0:00 | 3:00 | 6:00 | 9:00 | 12:00 | 15:00 | 18:00 | 21:00 | |
| Weather | ||||||||
| Sky condition |  | | |  |  | |  |  |
| Outside temperature | 25°C (78°F) | 25°C (76°F) | 24°C (75°F) | 25°C (77°F) | 23°C (73°F) | 24°C (76°F) | 25°C (76°F) | 25°C (78°F) |
| Perceived temperature | 27°C (81°F) | 26°C (79°F) | 26°C (79°F) | 27°C (80°F) | 25°C (77°F) | 26°C (78°F) | 26°C (79°F) | 27°C (81°F) |
| Precipitation | 0in | 0in | 0in | 0in | 0in | 0in | 0in | 0in |
| Humidity | 77% | 77% | 77% | 72% | 62% | 62% | 69% | 72% |
| Barometric pressure | 1015 hPa | 1014 hPa | 1015 hPa | 1017 hPa | 1016 hPa | 1013 hPa | 1014 hPa | 1015 hPa |
| Cloud cover | 0% | 0% | 0% | 0% | 3% | 2% | 87% | 9% |
| Heat index | 27°C (81°F) | 26°C (79°F) | 26°C (79°F) | 27°C (80°F) | 25°C (77°F) | 26°C (78°F) | 26°C (79°F) | 27°C (81°F) |
| Dew point | 21°C (70°F) | 20°C (68°F) | 20°C (68°F) | 19°C (67°F) | 15°C (59°F) | 17°C (62°F) | 19°C (65°F) | 20°C (68°F) |
| Wind | ||||||||
| Speed | 9km/h (6mph) | 5km/h (3mph) | 7km/h (4mph) | 8km/h (5mph) | 6km/h (4mph) | 6km/h (4mph) | 9km/h (6mph) | 6km/h (4mph) |
| Gusts | 15km/h (9mph) | 8km/h (5mph) | 11km/h (7mph) | 11km/h (7mph) | 12km/h (8mph) | 11km/h (7mph) | 16km/h (10mph) | 9km/h (6mph) |
| Direction | 86° E | 131° SE | 111° ESE | 107° ESE | 320° NW | 304° NW | 347° NNW | 20° NNE |
| Wind chill | 25°C (78°F) | 25°C (76°F) | 24°C (75°F) | 25°C (77°F) | 23°C (73°F) | 24°C (76°F) | 25°C (76°F) | 25°C (78°F) |
| Waves | ||||||||
| Height | 0.9m (3.1ft) | 0.9m (3.0ft) | 0.9m (3.0ft) | 0.9m (2.9ft) | 0.9m (2.9ft) | 0.9m (2.9ft) | 0.8m (2.8ft) | 0.8m (2.7ft) |
| Direction | 35° NE | 39° NE | 27° NNE | 26° NNE | 34° NNE | 34° NE | 36° NE | 36° NE |
| Period | 7.7 sec. | 8.8 sec. | 8.9 sec. | 9.1 sec. | 9.3 sec. | 9.2 sec. | 9.1 sec. | 9.1 sec. |
| Significant height | 0.9m (3ft) | 0.8m (2.6ft) | 0.8m (2.6ft) | 0.7m (2.3ft) | 0.8m (2.6ft) | 0.7m (2.3ft) | 0.7m (2.3ft) | 0.8m (2.6ft) |
| Sea water temperature | ||||||||
| Water temperature | 28°C (83°F) | 28°C (83°F) | 28°C (83°F) | 28°C (83°F) | 28°C (83°F) | 28°C (83°F) | 28°C (83°F) | 28°C (83°F) |
Sea weather on Tuesday 16 December 2025
On Tuesday 16 December 2025, the sun will rise at 06:53 and will set at 17:55 on the beach(es) of San Sebastian. The outside temperature will be a high of 81°F t and a low of 74°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 6.8mph km/h (with gusts up to 9.9mph). Wave height will be up to 2.6ft today.
| 0:00 | 3:00 | 6:00 | 9:00 | 12:00 | 15:00 | 18:00 | 21:00 | |
| Weather | ||||||||
| Sky condition | | | | | |  | | |
| Outside temperature | 25°C (78°F) | 25°C (77°F) | 25°C (76°F) | 26°C (78°F) | 23°C (74°F) | 27°C (80°F) | 26°C (79°F) | 26°C (78°F) |
| Perceived temperature | 27°C (81°F) | 27°C (80°F) | 26°C (80°F) | 28°C (82°F) | 25°C (77°F) | 29°C (84°F) | 29°C (83°F) | 28°C (83°F) |
| Precipitation | 0in | 0in | 0in | 0in | 0in | 0in | 0in | 0in |
| Humidity | 76% | 78% | 78% | 74% | 68% | 73% | 76% | 78% |
| Barometric pressure | 1014 hPa | 1013 hPa | 1014 hPa | 1016 hPa | 1015 hPa | 1013 hPa | 1014 hPa | 1015 hPa |
| Cloud cover | 72% | 20% | 7% | 4% | 4% | 86% | 74% | 79% |
| Heat index | 27°C (81°F) | 27°C (80°F) | 26°C (80°F) | 28°C (82°F) | 25°C (77°F) | 29°C (84°F) | 29°C (83°F) | 28°C (83°F) |
| Dew point | 21°C (69°F) | 21°C (69°F) | 20°C (69°F) | 21°C (69°F) | 17°C (63°F) | 21°C (70°F) | 22°C (71°F) | 22°C (71°F) |
| Wind | ||||||||
| Speed | 8km/h (5mph) | 9km/h (5mph) | 8km/h (5mph) | 11km/h (7mph) | 8km/h (5mph) | 5km/h (3mph) | 8km/h (5mph) | 9km/h (5mph) |
| Gusts | 11km/h (7mph) | 13km/h (8mph) | 12km/h (7mph) | 14km/h (9mph) | 16km/h (10mph) | 7km/h (4mph) | 12km/h (7mph) | 13km/h (8mph) |
| Direction | 104° ESE | 151° SSE | 119° ESE | 69° ENE | 38° NE | 34° NNE | 72° ENE | 68° ENE |
| Wind chill | 25°C (78°F) | 25°C (77°F) | 25°C (76°F) | 26°C (78°F) | 23°C (74°F) | 27°C (80°F) | 26°C (79°F) | 26°C (78°F) |
| Waves | ||||||||
| Height | 0.8m (2.6ft) | 0.8m (2.5ft) | 0.7m (2.4ft) | 0.7m (2.3ft) | 0.7m (2.3ft) | 0.7m (2.2ft) | 0.7m (2.2ft) | 0.8m (2.8ft) |
| Direction | 36° NE | 26° NNE | 27° NNE | 27° NNE | 28° NNE | 27° NNE | 25° NNE | 19° NNE |
| Period | 9.1 sec. | 9.1 sec. | 9.1 sec. | 9.1 sec. | 9.1 sec. | 9.1 sec. | 9.1 sec. | 9.1 sec. |
| Significant height | 0.8m (2.6ft) | 0.7m (2.3ft) | 0.6m (2ft) | 0.6m (2ft) | 0.6m (2ft) | 0.6m (2ft) | 0.6m (2ft) | 0.7m (2.3ft) |
| Sea water temperature | ||||||||
| Water temperature | 28°C (83°F) | 28°C (83°F) | 28°C (83°F) | 28°C (83°F) | 28°C (83°F) | 28°C (83°F) | 28°C (83°F) | 28°C (83°F) |
Sea weather on Wednesday 17 December 2025
On Wednesday 17 December 2025, the sun will rise at 06:54 and will set at 17:56 on the beach(es) of San Sebastian. The outside temperature will be a high of 81°F t and a low of 74°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 13.1mph km/h (with gusts up to 21.1mph). Wave height will be up to 5.9ft today.
| 0:00 | 3:00 | 6:00 | 9:00 | 12:00 | 15:00 | 18:00 | 21:00 | |
| Weather | ||||||||
| Sky condition | | | | | | | | |
| Outside temperature | 25°C (77°F) | 24°C (76°F) | 24°C (75°F) | 25°C (77°F) | 24°C (74°F) | 27°C (80°F) | 26°C (79°F) | 25°C (78°F) |
| Perceived temperature | 27°C (81°F) | 26°C (79°F) | 26°C (79°F) | 27°C (81°F) | 25°C (78°F) | 29°C (84°F) | 28°C (83°F) | 28°C (82°F) |
| Precipitation | 0in | 0in | 0in | 0in | 0in | 0in | 0in | 0in |
| Humidity | 81% | 82% | 80% | 78% | 69% | 72% | 78% | 81% |
| Barometric pressure | 1015 hPa | 1014 hPa | 1015 hPa | 1017 hPa | 1015 hPa | 1013 hPa | 1013 hPa | 1015 hPa |
| Cloud cover | 12% | 5% | 3% | 4% | 9% | 81% | 83% | 87% |
| Heat index | 27°C (81°F) | 26°C (79°F) | 26°C (79°F) | 27°C (81°F) | 25°C (78°F) | 29°C (84°F) | 28°C (83°F) | 28°C (82°F) |
| Dew point | 22°C (71°F) | 21°C (70°F) | 20°C (69°F) | 21°C (70°F) | 18°C (64°F) | 21°C (70°F) | 22°C (71°F) | 22°C (71°F) |
| Wind | ||||||||
| Speed | 12km/h (8mph) | 15km/h (9mph) | 15km/h (10mph) | 17km/h (11mph) | 16km/h (10mph) | 15km/h (9mph) | 21km/h (13mph) | 19km/h (12mph) |
| Gusts | 19km/h (12mph) | 24km/h (15mph) | 24km/h (15mph) | 23km/h (15mph) | 34km/h (21mph) | 22km/h (14mph) | 30km/h (19mph) | 29km/h (18mph) |
| Direction | 107° ESE | 87° E | 88° E | 82° E | 72° ENE | 70° ENE | 65° ENE | 97° E |
| Wind chill | 25°C (77°F) | 24°C (76°F) | 24°C (75°F) | 25°C (77°F) | 24°C (74°F) | 27°C (80°F) | 26°C (79°F) | 25°C (78°F) |
| Waves | ||||||||
| Height | 1.1m (3.7ft) | 1.5m (5.0ft) | 1.7m (5.7ft) | 1.8m (5.8ft) | 1.8m (5.8ft) | 1.8m (5.9ft) | 1.6m (5.4ft) | 1.6m (5.2ft) |
| Direction | 358° N | 351° N | 351° N | 348° NNW | 347° NNW | 348° NNW | 349° N | 351° N |
| Period | 11.5 sec. | 12.7 sec. | 12.3 sec. | 11.7 sec. | 11.3 sec. | 11.1 sec. | 11.0 sec. | 10.9 sec. |
| Significant height | 0.9m (3ft) | 0.7m (2.3ft) | 0.8m (2.6ft) | 0.8m (2.6ft) | 0.9m (3ft) | 1.1m (3.6ft) | 1.0m (3.3ft) | 0.8m (2.6ft) |
| Sea water temperature | ||||||||
| Water temperature | 28°C (83°F) | 28°C (83°F) | 28°C (83°F) | 28°C (83°F) | 28°C (83°F) | 28°C (83°F) | 28°C (83°F) | 28°C (83°F) |
Sea weather on Thursday 18 December 2025
On Thursday 18 December 2025, the sun will rise at 06:55 and will set at 17:56 on the beach(es) of San Sebastian. The outside temperature will be a high of 81°F t and a low of 74°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 16.2mph km/h (with gusts up to 26.7mph). Wave height will be up to 4.9ft today.
| 0:00 | 3:00 | 6:00 | 9:00 | 12:00 | 15:00 | 18:00 | 21:00 | |
| Weather | ||||||||
| Sky condition | | | | | | | | |
| Outside temperature | 25°C (76°F) | 24°C (75°F) | 24°C (74°F) | 26°C (78°F) | 27°C (80°F) | 26°C (79°F) | 25°C (77°F) | 25°C (77°F) |
| Perceived temperature | 27°C (80°F) | 26°C (78°F) | 26°C (78°F) | 28°C (82°F) | 29°C (84°F) | 28°C (83°F) | 27°C (80°F) | 27°C (80°F) |
| Precipitation | 0in | 0in | 0in | 0in | 0in | 0in | 0in | 0in |
| Humidity | 81% | 79% | 81% | 76% | 68% | 71% | 73% | 76% |
| Barometric pressure | 1015 hPa | 1014 hPa | 1014 hPa | 1016 hPa | 1015 hPa | 1014 hPa | 1014 hPa | 1016 hPa |
| Cloud cover | 7% | 2% | 3% | 70% | 81% | 77% | 0% | 0% |
| Heat index | 27°C (80°F) | 26°C (78°F) | 26°C (78°F) | 28°C (82°F) | 29°C (84°F) | 28°C (83°F) | 27°C (80°F) | 27°C (80°F) |
| Dew point | 21°C (70°F) | 20°C (68°F) | 20°C (68°F) | 21°C (70°F) | 21°C (69°F) | 21°C (69°F) | 20°C (68°F) | 20°C (69°F) |
| Wind | ||||||||
| Speed | 18km/h (11mph) | 15km/h (10mph) | 19km/h (12mph) | 21km/h (13mph) | 22km/h (14mph) | 18km/h (11mph) | 26km/h (16mph) | 23km/h (15mph) |
| Gusts | 26km/h (16mph) | 24km/h (15mph) | 31km/h (19mph) | 28km/h (18mph) | 34km/h (21mph) | 27km/h (17mph) | 43km/h (27mph) | 36km/h (22mph) |
| Direction | 82° E | 91° E | 81° E | 83° E | 65° ENE | 62° ENE | 67° ENE | 83° E |
| Wind chill | 25°C (76°F) | 24°C (75°F) | 24°C (74°F) | 26°C (78°F) | 27°C (80°F) | 26°C (79°F) | 25°C (77°F) | 25°C (77°F) |
| Waves | ||||||||
| Height | 1.5m (4.8ft) | 1.4m (4.5ft) | 1.3m (4.4ft) | 1.3m (4.2ft) | 1.2m (4.0ft) | 1.3m (4.4ft) | 1.3m (4.4ft) | 1.5m (4.8ft) |
| Direction | 352° N | 353° N | 354° N | 357° N | 359° N | 2° N | 2° N | 359° N |
| Period | 10.8 sec. | 10.5 sec. | 10.4 sec. | 10.4 sec. | 10.3 sec. | 10.1 sec. | 9.9 sec. | 9.6 sec. |
| Significant height | 0.9m (3ft) | 0.7m (2.3ft) | 0.7m (2.3ft) | 0.7m (2.3ft) | 0.7m (2.3ft) | 1.7m (5.6ft) | 1.3m (4.3ft) | 1.6m (5.2ft) |
| Sea water temperature | ||||||||
| Water temperature | 28°C (83°F) | 28°C (83°F) | 28°C (83°F) | 28°C (83°F) | 28°C (83°F) | 28°C (83°F) | 28°C (83°F) | 28°C (83°F) |
Sea weather on Friday 19 December 2025
On Friday 19 December 2025, the sun will rise at 06:55 and will set at 17:57 on the beach(es) of San Sebastian. The outside temperature will be a high of 79°F t and a low of 74°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 16.2mph km/h (with gusts up to 24.2mph). 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 | 24°C (76°F) | 24°C (75°F) | 24°C (75°F) | 24°C (75°F) | 24°C (74°F) | 25°C (77°F) | 26°C (79°F) | 25°C (78°F) |
| Perceived temperature | 26°C (80°F) | 26°C (79°F) | 26°C (79°F) | 26°C (79°F) | 25°C (78°F) | 27°C (80°F) | 28°C (83°F) | 28°C (82°F) |
| Precipitation | 0in | 0in | 0in | 0in | 0in | 0in | 0in | 0in |
| Humidity | 83% | 82% | 82% | 75% | 64% | 69% | 77% | 82% |
| Barometric pressure | 1015 hPa | 1014 hPa | 1015 hPa | 1016 hPa | 1016 hPa | 1014 hPa | 1015 hPa | 1016 hPa |
| Cloud cover | 0% | 3% | 78% | 10% | 3% | 11% | 23% | 16% |
| Heat index | 26°C (80°F) | 26°C (79°F) | 26°C (79°F) | 26°C (79°F) | 25°C (78°F) | 27°C (80°F) | 28°C (83°F) | 28°C (82°F) |
| Dew point | 21°C (70°F) | 21°C (69°F) | 21°C (69°F) | 19°C (67°F) | 16°C (62°F) | 19°C (66°F) | 22°C (71°F) | 22°C (72°F) |
| Wind | ||||||||
| Speed | 22km/h (13mph) | 18km/h (11mph) | 19km/h (12mph) | 15km/h (9mph) | 11km/h (7mph) | 13km/h (8mph) | 20km/h (12mph) | 26km/h (16mph) |
| Gusts | 34km/h (21mph) | 28km/h (18mph) | 31km/h (19mph) | 24km/h (15mph) | 23km/h (14mph) | 22km/h (14mph) | 29km/h (18mph) | 39km/h (24mph) |
| Direction | 84° E | 93° E | 87° E | 88° E | 72° ENE | 45° NE | 65° ENE | 72° ENE |
| Wind chill | 24°C (76°F) | 24°C (75°F) | 24°C (75°F) | 24°C (75°F) | 24°C (74°F) | 25°C (77°F) | 26°C (79°F) | 25°C (78°F) |
| Waves | ||||||||
| Height | 1.3m (4.4ft) | 1.2m (4.1ft) | 1.2m (3.9ft) | 1.1m (3.6ft) | 1.1m (3.6ft) | 1.2m (3.9ft) | 1.1m (3.6ft) | 1.1m (3.6ft) |
| Direction | 359° N | 240° WSW | 81° E | 3° N | 5° N | 7° N | 7° N | 7° N |
| Period | 9.6 sec. | 9.5 sec. | 9.2 sec. | 9.0 sec. | 10.0 sec. | 11.1 sec. | 8.6 sec. | 8.2 sec. |
| Significant height | 1.3m (4.3ft) | 1.0m (3.3ft) | 0.9m (3ft) | 0.8m (2.6ft) | 0.9m (3ft) | 1.2m (3.9ft) | 1.3m (4.3ft) | 1.5m (4.9ft) |
| Sea water temperature | ||||||||
| Water temperature | 28°C (83°F) | 28°C (83°F) | 28°C (83°F) | 28°C (83°F) | 28°C (83°F) | 28°C (83°F) | 28°C (83°F) | 28°C (83°F) |
Sea weather on Saturday 20 December 2025
On Saturday 20 December 2025, the sun will rise at 06:56 and will set at 17:57 on the beach(es) of San Sebastian. The outside temperature will be a high of 77°F t and a low of 74°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 26.7mph). 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 | 25°C (77°F) | 25°C (77°F) | 25°C (77°F) | 25°C (76°F) | 24°C (75°F) | 25°C (77°F) | 25°C (78°F) | 25°C (78°F) |
| Perceived temperature | 27°C (81°F) | 27°C (81°F) | 27°C (81°F) | 27°C (80°F) | 26°C (78°F) | 27°C (80°F) | 27°C (81°F) | 27°C (81°F) |
| Precipitation | 0in | 0in | 0in | 0in | 0in | 0in | 0in | 0in |
| Humidity | 83% | 83% | 82% | 77% | 70% | 70% | 74% | 78% |
| Barometric pressure | 1016 hPa | 1015 hPa | 1015 hPa | 1017 hPa | 1016 hPa | 1015 hPa | 1015 hPa | 1017 hPa |
| Cloud cover | 11% | 18% | 11% | 5% | 7% | 6% | 3% | 14% |
| Heat index | 27°C (81°F) | 27°C (81°F) | 27°C (81°F) | 27°C (80°F) | 26°C (78°F) | 27°C (80°F) | 27°C (81°F) | 27°C (81°F) |
| Dew point | 22°C (71°F) | 22°C (71°F) | 22°C (71°F) | 20°C (68°F) | 18°C (64°F) | 19°C (67°F) | 20°C (69°F) | 21°C (70°F) |
| Wind | ||||||||
| Speed | 23km/h (14mph) | 22km/h (14mph) | 23km/h (14mph) | 24km/h (15mph) | 24km/h (15mph) | 25km/h (15mph) | 29km/h (18mph) | 29km/h (18mph) |
| Gusts | 35km/h (22mph) | 33km/h (21mph) | 34km/h (21mph) | 33km/h (20mph) | 29km/h (18mph) | 30km/h (18mph) | 39km/h (24mph) | 43km/h (27mph) |
| Direction | 77° ENE | 76° ENE | 76° ENE | 76° ENE | 67° ENE | 61° ENE | 67° ENE | 71° ENE |
| Wind chill | 25°C (77°F) | 25°C (77°F) | 25°C (77°F) | 25°C (76°F) | 24°C (75°F) | 25°C (77°F) | 25°C (78°F) | 25°C (78°F) |
| Waves | ||||||||
| Height | 1.1m (3.6ft) | 1.0m (3.3ft) | 1.0m (3.3ft) | 1.1m (3.6ft) | 1.2m (3.9ft) | 1.2m (3.9ft) | 1.2m (3.9ft) | 1.2m (3.9ft) |
| Direction | 7° N | 8° N | 10° N | 13° NNE | 23° NNE | 34° NE | 21° NNE | 25° NNE |
| Period | 8.1 sec. | 8.0 sec. | 10.5 sec. | 15.6 sec. | 15.0 sec. | 14.8 sec. | 14.7 sec. | 14.5 sec. |
| Significant height | 1.2m (3.9ft) | 1.2m (3.9ft) | 1.2m (3.9ft) | 1.0m (3.3ft) | 1.2m (3.9ft) | 1.2m (3.9ft) | 1.0m (3.3ft) | 1.1m (3.6ft) |
| Sea water temperature | ||||||||
| Water temperature | 28°C (83°F) | 28°C (83°F) | 28°C (83°F) | 28°C (83°F) | 28°C (83°F) | 28°C (83°F) | 28°C (83°F) | 28°C (83°F) |
Sea weather on Sunday 21 December 2025
On Sunday 21 December 2025, the sun will rise at 06:56 and will set at 17:58 on the beach(es) of San Sebastian. The outside temperature will be a high of 81°F t and a low of 77°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 20.5mph km/h (with gusts up to 30.5mph). Wave height will be up to 5.6ft today.
| 0:00 | 3:00 | 6:00 | 9:00 | 12:00 | 15:00 | 18:00 | 21:00 | |
| Weather | ||||||||
| Sky condition | | | | | | | | |
| Outside temperature | 25°C (78°F) | 25°C (78°F) | 25°C (77°F) | 26°C (78°F) | 27°C (80°F) | 27°C (80°F) | 26°C (79°F) | 25°C (78°F) |
| Perceived temperature | 27°C (81°F) | 27°C (81°F) | 27°C (81°F) | 28°C (82°F) | 29°C (84°F) | 29°C (84°F) | 28°C (83°F) | 28°C (82°F) |
| Precipitation | 0in | 0in | 0in | 0in | 0in | 0in | 0in | 0in |
| Humidity | 78% | 77% | 78% | 75% | 70% | 72% | 77% | 81% |
| Barometric pressure | 1017 hPa | 1016 hPa | 1016 hPa | 1017 hPa | 1017 hPa | 1015 hPa | 1015 hPa | 1017 hPa |
| Cloud cover | 31% | 16% | 5% | 12% | 30% | 19% | 14% | 15% |
| Heat index | 27°C (81°F) | 27°C (81°F) | 27°C (81°F) | 28°C (82°F) | 29°C (84°F) | 29°C (84°F) | 28°C (83°F) | 28°C (82°F) |
| Dew point | 21°C (70°F) | 21°C (70°F) | 21°C (70°F) | 21°C (70°F) | 21°C (70°F) | 21°C (70°F) | 22°C (71°F) | 22°C (71°F) |
| Wind | ||||||||
| Speed | 28km/h (17mph) | 29km/h (18mph) | 27km/h (17mph) | 28km/h (17mph) | 29km/h (18mph) | 30km/h (19mph) | 33km/h (21mph) | 32km/h (20mph) |
| Gusts | 41km/h (25mph) | 41km/h (25mph) | 39km/h (24mph) | 40km/h (25mph) | 44km/h (28mph) | 45km/h (28mph) | 49km/h (30mph) | 46km/h (28mph) |
| Direction | 66° ENE | 69° ENE | 75° ENE | 75° ENE | 69° ENE | 65° ENE | 64° ENE | 70° ENE |
| Wind chill | 25°C (78°F) | 25°C (78°F) | 25°C (77°F) | 26°C (78°F) | 27°C (80°F) | 27°C (80°F) | 26°C (79°F) | 25°C (78°F) |
| Waves | ||||||||
| Height | 1.5m (4.9ft) | 1.7m (5.6ft) | 1.7m (5.6ft) | 1.6m (5.2ft) | 1.6m (5.2ft) | 1.6m (5.2ft) | 1.5m (4.9ft) | 1.4m (4.6ft) |
| Direction | 31° NNE | 29° NNE | 30° NNE | 32° NNE | 34° NNE | 34° NE | 35° NE | 36° NE |
| Period | 14.4 sec. | 14.4 sec. | 14.3 sec. | 14.2 sec. | 14.0 sec. | 13.6 sec. | 12.5 sec. | 11.8 sec. |
| Significant height | 1.4m (4.6ft) | 1.4m (4.6ft) | 1.4m (4.6ft) | 1.3m (4.3ft) | 1.3m (4.3ft) | 1.3m (4.3ft) | 1.1m (3.6ft) | 1.0m (3.3ft) |
| Sea water temperature | ||||||||
| Water temperature | 28°C (83°F) | 28°C (83°F) | 28°C (83°F) | 28°C (83°F) | 28°C (83°F) | 28°C (83°F) | 28°C (83°F) | 28°C (83°F) |