Weather in Mariehamn in May 2025
Average weather
Average temperature in Mariehamn in May
Going from a maximum of +15°C during the day to a minimum of 0°C during the night, the temperature in May averages around +10°C.
The average maximum temperature goes up 60% by the end of the month, compared with the beginning of the month, from +5°C to +14°C.
Is Mariehamn warm or cold in May?
Mariehamn is typically cool in May.
Maximum temperatures go up compared to the previous month from +5°C to +10°C. The minimum temperature also goes up from +1°C to +5°C.
Pack a sweater and a jacket as there will be cooler temperatures.
Take a look at how May is compared to other months in Mariehamn:
Climate in Mariehamn in May
| April | May | June | ||||
|---|---|---|---|---|---|---|
| Avg. temperature | ||||||
| +5°C | +10°C | +15°C | ||||
| Min. temperature | ||||||
| -8°C | -5°C | 0°C | ||||
| Max. temperature | ||||||
| +15°C | +21°C | +27°C | ||||
| Rainfall | ||||||
| 21 mm | 31 mm | 45 mm | ||||
| Wind | ||||||
| 5 m/s | 4 m/s | 4 m/s | ||||
| Humidity | ||||||
| 84% | 84% | 85% | ||||
| Air pressure | ||||||
| 1013 HPa | 1014 HPa | 1011 HPa | ||||
| Sunny days | ||||||
| 7 | 10 | 9 | ||||
| Cloudy days | ||||||
| 11 | 11 | 10 | ||||
| Rainy days | ||||||
| 7 | 10 | 11 | ||||
| Snowy days | ||||||
| 4 | 0 | 0 | ||||
May weather is still as ok as in April. It’s getting warmer as May arrives. The average maximum temperature goes up from +5°C to +10°C during the day. Prepare for more rain. Average rainfall goes from 21 mm to 31 mm. Humidity levels don’t change as the month goes on, averaging around 84%. Winds are calmer in comparison to April, going down from 5 m/s to 4 m/s on average. The good news is there are likely to be more sunny days in May, from 7 to 10.
June brings much the same weather, it remains ok.
Wind
The average wind speed is 4 m/s getting up to 5 m/s which is a light breeze; barely moving the tree leaves.
The average wind speed in Mariehamn is gradually increasing during May, going from 4 m/s to 4 m/s over the course of the month.
Rain
How was the weather last May in Mariehamn?
Climate Change over Years
The climate in Mariehamn 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 2018 with only 269 mm of rainfall, and the wettest year was 2020 with 612 mm.
FAQ
Is May a good time to visit Mariehamn?
Can you sunbathe in Mariehamn in May?
Is Mariehamn rainy in May?
Is it sunny in Mariehamn in May?
Monthly weather in Mariehamn
Source of the data
For this page, we’ve looked at the typical weather in Mariehamn, 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.