Cool
Average highs are around 19°C, so pack for cooler days.
Weather Guide
Isles of Scilly, United Kingdom Average Monthly Weather
Weather score25Poor annual avg
Best months: July, August, June
Across the year, average daytime temperatures are around 13°C, sunshine averages 4.5h per day, and rainfall totals about 1183mm. Sea temperatures average 13°C across the year.
Annual weather
Annual averages
Temp
13°C
Rain
1183mm
Annual total
Sun
4.5h
Sea
13°C
Weather score
25
Poor avg
Seasonal climate calendar
TemperatureTemp
RainRain
SunSun
SwimSwim
Weather scoreWeather score
Trip feel
Drier
Rainfall averages 62mm, which is relatively low for holiday planning.
Some sun
Sunshine averages 6.8h per day, enough for a balanced month.
Cool sea
Sea temperatures average 17°C, so the water can feel cool.
Map
Weather map
Compare Isles of Scilly, United Kingdom with nearby places by weather score, rain, sun, temperature, and swim conditions.
Temperature
July19°C average high
July is one of Isles of Scilly's hottest months, so shade and slower afternoons matter.
Warmest monthsJune to September
This stretch sets the upper range for average daytime heat.
Rain
July62mm average rain
July is one of Isles of Scilly's driest months, making outdoor days easier to plan than in wetter parts of the year.
Driest monthsApril to September
This is the drier part of the year, when outdoor plans usually need less weather flexibility.
Sun
July6.8 hours average sun
July is one of Isles of Scilly's sunniest months, with some of the strongest bright-day conditions in the yearly averages.
Brightest monthsApril to August
This stretch has the strongest sunshine in the monthly averages.
Sea temperature
July17°C average sea
July is one of Isles of Scilly's warmest sea months, when swimming comfort is usually strongest.
Warmest seaJuly to September
Sea temperatures are usually near 17°C in this stretch, so swimming comfort is at its strongest.
Weather score
July44 weather score
July is one of Isles of Scilly's best weather-score months, combining the strongest overall balance in the yearly averages.
Best weather monthsJune to August
These months have the strongest weather score in the monthly averages.
