Cool
Average highs are around 16°C, so pack for cooler days.
September verdict
Achill Island, Ireland in September
Weather score20Poor
Poor for holiday weather
Average highs are around 16°C, so pack for cooler days. Sunshine averages 3.5h per day, so this is not one of the brighter months. Rainfall averages 116mm, so some wet days are possible.
September weather
Monthly averages
Temp
16°C
Rain
116mm
Sun
3.5h
Sea
15°C
Weather score
20
Poor
Seasonal climate calendar
TemperatureTemp
RainRain
SunSun
SwimSwim
Weather scoreWeather score
Trip feel
Showers
Rainfall averages 116mm, so some wet days are possible.
Limited sun
Sunshine averages 3.5h 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 Achill Island, Ireland with nearby places by weather score, rain, sun, temperature, and swim conditions.
Temperature
September16°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
September116mm average rain
September is wetter than Achill Island'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
September3.5 hours average sun
September sits close to Achill Island's yearly sunshine average, so it is a middle-of-the-pack month for bright days.
Brightest monthsApril to June
This stretch has the strongest sunshine in the monthly averages.
Sea temperature
September15°C average sea
September is one of Achill Island's warmest sea months, when swimming comfort is usually strongest.
Warmest seaJuly to September
Sea temperatures are usually near 15°C in this stretch, so swimming comfort is at its strongest.
Weather score
September20 weather score
September sits close to Achill Island's yearly weather-score average, giving a typical overall read on the month.
Best weather monthsApril to August
These months have the strongest weather score in the monthly averages.
