Cool
Average highs are around 15°C, so pack for cooler days.
May verdict
Helsinki, Finland in May
Weather score36Poor
Poor for holiday weather
Average highs are around 15°C, so pack for cooler days. Sunshine averages 8.2h per day, so bright days are a strong part of the month. Rainfall averages 33mm, which is relatively low for holiday planning.
May weather
Monthly averages
Temp
15°C
Rain
33mm
Sun
8.2h
Sea
7°C
Weather score
36
Poor
Seasonal climate calendar
TemperatureTemp
RainRain
SunSun
SwimSwim
Weather scoreWeather score
Trip feel
Drier
Rainfall averages 33mm, which is relatively low for holiday planning.
Bright
Sunshine averages 8.2h per day, so bright days are a strong part of the month.
Cool sea
Sea temperatures average 7°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
May15°C average high
May 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
May33mm average rain
May is one of Helsinki's driest months, making outdoor days easier to plan than in wetter parts of the year.
Driest monthsJanuary to June and December
This is the drier part of the year, when outdoor plans usually need less weather flexibility.
Sun
May8.2 hours average sun
May is brighter than Helsinki's yearly average, though the strongest sunshine usually sits closer to the peak months.
Brightest monthsMay to July
This stretch has the strongest sunshine in the monthly averages.
Sea temperature
May7°C average sea
May is below Helsinki's yearly sea-temperature average, so swimming can feel fresher.
Warmest seaJuly to September
Sea temperatures are usually near 17°C in this stretch, so swimming comfort is at its strongest.
Weather score
May36 weather score
May sits close to Helsinki's yearly weather-score average, giving a typical overall read on the month.
Best weather monthsJune to August
These months have the strongest weather score in the monthly averages.
