Weather in Helsinki in May 2025
- May is usually the driest month of the year in Helsinki
Average weather
Average temperature in Helsinki in May
The temperature in May is +15°C on average, with a range between a maximum of +22°C during the day and a minimum of -1°C at night.
The average maximum temperature goes up 35% by the end of the month, compared with the beginning of the month, from +10°C to +18°C.
Is Helsinki warm or cold in May?
Helsinki is typically mild in May.
Maximum temperatures go up compared to the previous month from +6°C to +12°C. The minimum temperature also goes up from 0°C to +5°C.
Pack a light jacket as it will be warm in the day and cool in the evenings.
Take a look at how May is compared to other months in Helsinki:
Water temperature in Helsinki in May
Water in Helsinki in May is Cold. It varies from -2°C to +9°C, with an average of +4°C. The air temperature averaging +12°C is higher than the water temperature.
In May, water temperatures are average relative to the rest of the year:
Can you swim in Helsinki in May?
Climate in Helsinki in May
| April | May | June | ||||
|---|---|---|---|---|---|---|
| Avg. temperature | ||||||
| +6°C | +12°C | +16°C | ||||
| Min. temperature | ||||||
| -10°C | -2°C | +2°C | ||||
| Max. temperature | ||||||
| +19°C | +26°C | +31°C | ||||
| Rainfall | ||||||
| 24 mm | 42 mm | 58 mm | ||||
| Wind | ||||||
| 4 m/s | 4 m/s | 3 m/s | ||||
| Avg. water temperature | ||||||
| +1°C | +4°C | +9°C | ||||
| Humidity | ||||||
| 72% | 68% | 72% | ||||
| Air pressure | ||||||
| 1012 HPa | 1013 HPa | 1011 HPa | ||||
| Sunny days | ||||||
| 9 | 12 | 10 | ||||
| Cloudy days | ||||||
| 9 | 7 | 7 | ||||
| Rainy days | ||||||
| 7 | 11 | 12 | ||||
| Snowy days | ||||||
| 5 | 0 | 0 | ||||
May weather is still as good as in April. It’s getting warmer as May arrives. The average maximum temperature goes up from +6°C to +12°C during the day. Prepare for more rain. Average rainfall goes from 24 mm to 42 mm. It feels drier, as humidity decreases from 72% to 68%. The average wind speed doesn’t change much during May, staying around 4 m/s. The good news is there are likely to be more sunny days in May, from 9 to 12.
June brings much the same weather, it remains good.
Wind
The average wind speed is 5 m/s getting up to 9 m/s which is a medium breeze. You can feel it, especially getting out of the water.
The average wind speed in Helsinki is gradually increasing during May, going from 5 m/s to 7 m/s over the course of the month.
Rain
How was the weather last May in Helsinki?
Climate Change over Years
The climate in Helsinki in May has not changed much over the last 43 years.
The average temperature was the lowest in 1987 (+5°C) and the highest in 2020 (+11°C). The driest year was 2002 with only 248 mm of rainfall, and the wettest year was 2020 with 1153 mm.
FAQ
Is May a good time to visit Helsinki?
Can you sunbathe in Helsinki in May?
Can you swim in Helsinki in May?
Is Helsinki rainy in May?
Is it sunny in Helsinki in May?
Other cities in Finland
Monthly weather in Helsinki
Source of the data
For this page, we’ve looked at the typical weather in Helsinki, based on historical hourly weather data from January 1, 1979, to December 31, 2023.
For past dates, we show actual recorded data at the location at that time. Forecasts are based on recorded weather during that day of the year, averaged over the total years for which we have records (unless stated otherwise). The daily temperature is the highest recorded temperature in the shadow during that day.