Swimming in Cardiff in september 2025: Average sea temperature in september and tide times in september 2025
Average sea temperature in Cardiff in september 2025.
In september, according to seasonal norms, the sea temperature in Cardiff is:
Minimum: 61°F
Average: 62°F
Maximum: 64°F
Other useful seasonal weather averages in september:
- Outside temperature: 54°F to 64°F
- Most common weather: "Partly Cloudy"
- The wind blows at 6.8mph
- It rains a total of 1.8in, over 3 day(s).
Should we swim in Cardiff in september?
No... The water temperature in Cardiff in september is cold
Swimming in Cardiff in september is possible... with a wetsuit! Indeed, the water is cold at this time of year with an average sea temperature of 62°F (minimum: 61°F - maximum: 64°F).
Note also that in september, the climate is good with an average outside temperature of 59°F, 1.8in of precipitation (over 3 days) and 89.99 % humidity.
Water and normal seasonal temperatures in Cardiff in september
| September | |||
| Average sea temperature | 62°F | ||
| Minimum sea temperature | 61°F | ||
| Maximum sea temperature | 64°F | ||
| Average outside temperature | 59°F | ||
| Maximum outside temperature | 65°F | ||
| Minimum outside temperature | 54°F | ||
| Wind speed | 13.1mph | ||
| Wind temperature | 52°F | ||
| Precipitation | 1.8in | ||
| Number of days of rain | 3 jour(s) (9%) | ||
| Humidity | 90% | ||
| Visibility in kilometers | 9.03km | ||
| Cloud cover | 48% | ||
| Our opinion | cold swimming |
Chart of the tides in september 2025
Tide times in september 2025 in Cardiff
Swim elsewhere in Wales in september
| City | Average T° | Min. T° | Max. T° | Our opinion | Pembrokeshire in september | 61°F | 63°F | cold swimming | Swansea in september | 62°F | 64°F | cold swimming | Barmouth in september | 61°F | 62°F | cold swimming | Llandudno in september | 61°F | 63°F | cold swimming |