Cool
Average highs are around 10°C, so pack for cooler days.
September verdict
Suomu, Finland in September
Weather score23Poor
Poor for holiday weather
Average highs are around 10°C, so pack for cooler days. Sunshine averages 2.9h per day, so this is not one of the brighter months. Rainfall averages 57mm, which is relatively low for holiday planning.
September weather
Monthly averages
Temp
10°C
Rain
57mm
Sun
2.9h
Weather score
23
Poor
Seasonal climate calendar
TemperatureTemp
RainRain
SunSun
Weather scoreWeather score
Trip feel
Drier
Rainfall averages 57mm, which is relatively low for holiday planning.
Limited sun
Sunshine averages 2.9h per day, so this is not one of the brighter months.
Map
Weather map
Compare Suomu, Finland with nearby places by weather score, rain, sun, temperature, and swim conditions.
Temperature
September10°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 August
This stretch sets the upper range for average daytime heat.
Rain
September57mm average rain
September is wetter than Suomu's yearly average, so flexible plans matter more.
Driest monthsJanuary to June and September to December
This is the drier part of the year, when outdoor plans usually need less weather flexibility.
Sun
September2.9 hours average sun
September is below Suomu's yearly sunshine average, so bright-day planning is less reliable than in peak months.
Brightest monthsMay to July
This stretch has the strongest sunshine in the monthly averages.
Weather score
September23 weather score
September is one of the weakest weather-score months, when the overall mix is less favourable than the rest of the year.
Best weather monthsJune to July
These months have the strongest weather score in the monthly averages.