Cool
Average highs are around 9°C, so pack for cooler days.
Weather Guide
Helsinki, Finland Average Monthly Weather
Weather score28Poor annual avg
Best months: July, June, August
Across the year, average daytime temperatures are around 8°C, sunshine averages 4.4h per day, and rainfall totals about 641mm. Sea temperatures average 8°C across the year.
Annual weather
Annual averages
Temp
8°C
Rain
641mm
Annual total
Sun
4.4h
Sea
8°C
Weather score
28
Poor avg
Seasonal climate calendar
Trip feel
Drier
Rainfall averages 72mm, which is relatively low for holiday planning.
Limited sun
Sunshine averages 2.6h per day, so this is not one of the brighter months.
Cool sea
Sea temperatures average 11°C, so the water can feel cool.
Map
Weather map
Compare Helsinki, Finland with nearby places by weather score, rain, sun, temperature, and swim conditions.
Temperature
October9°C average high
October is close to Helsinki's yearly temperature average, giving a typical read on daytime heat.
Warmest monthsJune to August
This stretch sets the upper range for average daytime heat.
Rain
October72mm average rain
October is one of Helsinki's wettest months, so rain is likely to be a major planning factor.
Driest monthsJanuary to June and December
This is the drier part of the year, when outdoor plans usually need less weather flexibility.
Sun
October2.6 hours average sun
October is below Helsinki'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.
Sea temperature
October11°C average sea
October is close to Helsinki's yearly sea-temperature average, so swimming comfort is fairly typical.
Warmest seaJuly to September
Sea temperatures are usually near 17°C in this stretch, so swimming comfort is at its strongest.
Weather score
October18 weather score
October 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 August
These months have the strongest weather score in the monthly averages.
