Isles of Scilly weather in May
Temperature, sea and sunshine in May: long-term averages from 30 years of weather data, not a forecast.
Holiday weather in May
Poor
Best time to visit: May – August
What is the weather like in Isles of Scilly in May?
In May, Isles of Scilly is cool: daytime highs average 12 °C, and nights cool down to about 11 °C. The sea averages 12.2 °C – swimming is only for the hardy. The sun shines for around 8 hours a day. Rain is frequent, with about 9 rainy days and 49 mm in total. It is often windy, with gusts of around 33 km/h. All in all, May is not an ideal month for a holiday in Isles of Scilly.
May compared
How the weather changes from April to June. Tap a month to open it.
More details for May
- Daylight
- 15 h 21 min05:41 – 21:02
- UV index
- 7 · highclear sky, noon (estimate)All months
- Muggy days
- 0 daysdew point 18 °C or moreAll months
- Wind
- 33 km/haverage daily peakAll months
- Cloud cover
- 62 %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 %75 %
- Few rainy daysweight 20 %64 %
Each factor is rated from 0 to 100 % and weighted for the travel style “Sun, sea & sand”.
What to pack in May
- Sunscreen
- Sunglasses & sun hat
- A jumper for the evenings
- Rain jacket or umbrella
- Windproof jacket
Isles of Scilly in May: quick answers
Is Isles of Scilly hot in May?
No. In May, Isles of Scilly is cool: daytime highs average 12 °C and nights drop to about 11 °C.
Can you swim in Isles of Scilly in May?
Only if you don't mind cold water: in May the sea averages just 12.2 °C. Comfortable swimming temperatures are not reached at any time of year.
Does it rain much in Isles of Scilly in May?
Rain is frequent, with about 9 rainy days and 49 mm in total.
Isles of Scilly month by month
The whole year in Isles of ScillyAll destinations: United KingdomWhere to go in MaySea temperature in May
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