Isles of Scilly weather in July
Temperature, sea and sunshine in July: long-term averages from 30 years of weather data, not a forecast.
Holiday weather in July
Poor
Best time to visit: May – August
What is the weather like in Isles of Scilly in July?
In July, Isles of Scilly is mild: daytime highs average 17 °C, and nights cool down to about 15 °C. The sea averages 16.5 °C – swimming is only for the hardy. The sun shines for around 7 hours a day. Rain falls on about 9 days, adding up to 50 mm. It is often windy, with gusts of around 31 km/h. All in all, July is not an ideal month for a holiday in Isles of Scilly.
July compared
How the weather changes from June to August. Tap a month to open it.
More details for July
- Daylight
- 15 h 58 min05:32 – 21:30
- UV index
- 7 · highclear sky, noon (estimate)All months
- Muggy days
- 0 daysdew point 18 °C or moreAll months
- Wind
- 31 km/haverage daily peakAll months
- Cloud cover
- 64 %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 %0 %
- Sunshineweight 20 %67 %
- Few rainy daysweight 20 %67 %
Each factor is rated from 0 to 100 % and weighted for the travel style “Sun, sea & sand”.
What to pack in July
- Sunscreen
- Sunglasses & sun hat
- A jumper for the evenings
- Rain jacket or umbrella
- Windproof jacket
Isles of Scilly in July: quick answers
Is Isles of Scilly hot in July?
No. In July, Isles of Scilly is mild: daytime highs average 17 °C and nights drop to about 15 °C.
Can you swim in Isles of Scilly in July?
Only if you don't mind cold water: in July the sea averages just 16.5 °C. Comfortable swimming temperatures are not reached at any time of year.
Does it rain much in Isles of Scilly in July?
Rain falls on about 9 days, adding up to 50 mm.
Isles of Scilly month by month
The whole year in Isles of ScillyAll destinations: United KingdomWhere to go in JulySea temperature in July
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