Cool
Average highs are around 16°C, so pack for cooler days.
Weather Guide
Isle of Arran, United Kingdom Average Monthly Weather
Weather score16Poor annual avg
Best months: June, July, May
Across the year, average daytime temperatures are around 10°C, sunshine averages 3.4h per day, and rainfall totals about 1640mm. Sea temperatures average 11°C across the year.
Annual weather
Annual averages
Temp
10°C
Rain
1640mm
Annual total
Sun
3.4h
Sea
11°C
Weather score
16
Poor avg
Seasonal climate calendar
TemperatureTemp
RainRain
SunSun
SwimSwim
Weather scoreWeather score
Trip feel
Showers
Rainfall averages 136mm, so some wet days are possible.
Limited sun
Sunshine averages 4.6h per day, so this is not one of the brighter months.
Cool sea
Sea temperatures average 15°C, so the water can feel cool.
Map
Weather map
Compare Isle of Arran, United Kingdom with nearby places by weather score, rain, sun, temperature, and swim conditions.
Temperature
August16°C average high
August is one of Isle of Arran's hottest months, so shade and slower afternoons matter.
Warmest monthsJune to September
This stretch sets the upper range for average daytime heat.
Rain
August136mm average rain
August sits near Isle of Arran's yearly rainfall average, so rain is a normal planning factor rather than an outlier.
Driest monthsFebruary and April to July
This is the drier part of the year, when outdoor plans usually need less weather flexibility.
Sun
August4.6 hours average sun
August is brighter than Isle of Arran's yearly average, though the strongest sunshine usually sits closer to the peak months.
Brightest monthsApril to July
This stretch has the strongest sunshine in the monthly averages.
Sea temperature
August15°C average sea
August is one of Isle of Arran's warmest sea months, when swimming comfort is usually strongest.
Warmest seaJune to September
Sea temperatures are usually near 13°C in this stretch, so swimming comfort is at its strongest.
Weather score
August23 weather score
August scores above Isle of Arran's yearly average, so the overall weather mix is stronger than most months.
Best weather monthsApril to August
These months have the strongest weather score in the monthly averages.
