Cool
Average highs are around 15°C, so pack for cooler days.
September verdict
Isle of Man in September
Weather score23Poor
Poor for holiday weather
Average highs are around 15°C, so pack for cooler days. Sunshine averages 4.2h per day, so this is not one of the brighter months. Rainfall averages 122mm, so some wet days are possible.
September weather
Monthly averages
Temp
15°C
Rain
122mm
Sun
4.2h
Sea
15°C
Weather score
23
Poor
Seasonal climate calendar
TemperatureTemp
RainRain
SunSun
SwimSwim
Weather scoreWeather score
Trip feel
Showers
Rainfall averages 122mm, so some wet days are possible.
Limited sun
Sunshine averages 4.2h 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 Man with nearby places by weather score, rain, sun, temperature, and swim conditions.
Temperature
September15°C average high
September sits in the warmer part of the year, so midday sightseeing can feel heavier than in cooler months.
Warmest monthsJune to September
This stretch sets the upper range for average daytime heat.
Rain
September122mm average rain
September is wetter than Isle of Man's yearly average, so flexible plans matter more.
Driest monthsFebruary and April to July
This is the drier part of the year, when outdoor plans usually need less weather flexibility.
Sun
September4.2 hours average sun
September sits close to Isle of Man's yearly sunshine average, so it is a middle-of-the-pack month for bright days.
Brightest monthsApril to August
This stretch has the strongest sunshine in the monthly averages.
Sea temperature
September15°C average sea
September is one of Isle of Man's warmest sea months, when swimming comfort is usually strongest.
Warmest seaJuly to October
Sea temperatures are usually near 14°C in this stretch, so swimming comfort is at its strongest.
Weather score
September23 weather score
September sits close to Isle of Man's yearly weather-score average, giving a typical overall read on the month.
Best weather monthsMay to August
These months have the strongest weather score in the monthly averages.