Swansea weather in August
Temperature, sea and sunshine in August: long-term averages from 30 years of weather data, not a forecast.
Holiday weather in August
Good
Best time to visit: June – September
What is the weather like in Swansea in August?
In August, Swansea is mild: daytime highs average 19 °C, and nights cool down to about 14 °C. The sea averages 17.9 °C – bracing, so a wetsuit helps for longer swims. Expect around 6 hours of sunshine a day. It rains often – on about 14 days, adding up to 91 mm. All in all, August is a good month for a holiday in Swansea.
August compared
How the weather changes from July to September. Tap a month to open it.
| JulyJul | AugustAug | SeptemberSep | |
|---|---|---|---|
| Score | 72 | 70 | 65 |
| Day | 19° | 19° | 17° |
| Night | 14° | 14° | 12° |
| Sea | 17° | 18° | 17° |
| Sun | 7 h | 6 h | 5 h |
| Rain days | 14 | 14 | 12 |
More details for August
- Daylight
- 14 h 42 min06:00 – 20:42
- UV index
- 6 · highclear sky, noon (estimate)All months
- Muggy days
- 0 daysdew point 18 °C or moreAll months
- Wind
- 23 km/haverage daily peakAll months
- Cloud cover
- 68 %on averageAll months
- Hot days
- 0 days30 °C or more
- Time zone
- UTC+1Europe/London
How the score comes together
- Temperatureweight 50 %100 %
- Sunshineweight 20 %57 %
- Few rainy daysweight 30 %29 %
Each factor is rated from 0 to 100 % and weighted for the travel style “City break”.
What to pack in August
- Wetsuit for longer swims
- Sunscreen
- A jumper for the evenings
- Rain jacket or umbrella
Swansea in August: quick answers
Is Swansea hot in August?
No. In August, Swansea is mild: daytime highs average 19 °C and nights drop to about 14 °C.
Can you swim in Swansea in August?
Only if you don't mind cold water: in August the sea averages just 17.9 °C. Comfortable swimming temperatures are not reached at any time of year.
Does it rain much in Swansea in August?
It rains often – on about 14 days, adding up to 91 mm.
Swansea month by month
The whole year in SwanseaAll destinations: United KingdomWhere to go in AugustSea temperature in August
Climate averages 1996–2025, not a forecast. Data: Copernicus ERA5 / ERA5-Land via Open-Meteo.com (CC BY 4.0), NOAA OISST, WMO 1991–2020 (NOAA NCEI), GeoNames (CC BY 4.0). Sources & licences