Isles of Scilly 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
Poor
Best time to visit: May – August
What is the weather like in Isles of Scilly in August?
In August, Isles of Scilly is mild: daytime highs average 17 °C, and nights cool down to about 16 °C. The sea averages 17.1 °C – bracing, so a wetsuit helps for longer swims. The sun shines for around 7 hours a day. Rain is frequent, with about 10 rainy days and 56 mm in total. It is often windy, with gusts of around 32 km/h. All in all, August is not an ideal month for a holiday in Isles of Scilly.
August compared
How the weather changes from July to September. Tap a month to open it.
| JulyJul | AugustAug | SeptemberSep | |
|---|---|---|---|
| Score | 27 | 25 | 21 |
| Day | 17° | 17° | 16° |
| Night | 15° | 16° | 15° |
| Sea | 17° | 17° | 16° |
| Sun | 7 h | 7 h | 6 h |
| Rain days | 9 | 10 | 10 |
More details for August
- Daylight
- 14 h 32 min06:14 – 20:46
- UV index
- 6 · highclear sky, noon (estimate)All months
- Muggy days
- 0 daysdew point 18 °C or moreAll months
- Wind
- 32 km/haverage daily peakAll months
- Cloud cover
- 66 %on averageAll months
- Hot days
- 0 days30 °C or more
- Time zone
- UTC+1Europe/London
How the score comes together
- Temperatureweight 35 %0 %
- Seaweight 25 %1 %
- Sunshineweight 20 %60 %
- Few rainy daysweight 20 %61 %
Each factor is rated from 0 to 100 % and weighted for the travel style “Sun, sea & sand”.
What to pack in August
- Sunscreen
- Sunglasses & sun hat
- A jumper for the evenings
- Rain jacket or umbrella
- Windproof jacket
Isles of Scilly in August: quick answers
Is Isles of Scilly hot in August?
No. In August, Isles of Scilly is mild: daytime highs average 17 °C and nights drop to about 16 °C.
Can you swim in Isles of Scilly in August?
Only if you don't mind cold water: in August the sea averages just 17.1 °C. Comfortable swimming temperatures are not reached at any time of year.
Does it rain much in Isles of Scilly in August?
Rain is frequent, with about 10 rainy days and 56 mm in total.
Isles of Scilly month by month
The whole year in Isles of ScillyAll 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