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Mariehamn in May: Weather, Average temperature and Climate

Planning a trip and want to know what the weather in Mariehamn in May will be like? Take a look at our weather guide for Mariehamn, based on historical data.
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May

Weather in Mariehamn in May 2025

OK Weather
Cool
☁️
Cloudy
If you plan to visit Mariehamn in May, the weather is typically alright, with an average high temperature of +10°C during the day and approximately 10 sunny days. Expect some rainy, though, as there are typically 10 rainy days in the month and around 31 mm of precipitation. The weather is changeable so you may have to pack for every eventuality. Search flights in one click on Avionero.

Average weather

☀️
+10°C
Avg. max. temperature
-5°C
Min.
+21°C
Max.
31 mm
Total precipitation
84%
Avg. humidity
4 m/s
Avg. wind
10 ☀️
Sunny Days
11 ⛅️
Cloudy
10 🌦
Rainy
Our opinion: Mariehamn has OK weather in May.
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Average temperature in Mariehamn in May

Here are the expected maximum, average and minimum temperatures in Mariehamn for May based on the historical data.
Last Year
Historical Data

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

Mariehamn weather looks like this, on average, in May and the surrounding months.
AprilMayJune
Avg. temperature
+5°C+10°C+15°C
Min. temperature
-8°C-5°C0°C
Max. temperature
+15°C+21°C+27°C
Rainfall
21 mm31 mm45 mm
Wind
5 m/s4 m/s4 m/s
Humidity
84%84%85%
Air pressure
1013 HPa1014 HPa1011 HPa
Sunny days
7109
Cloudy days
111110
Rainy days
71011
Snowy days
400

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

Wind speed in Mariehamn in May based on historical data.
Last Year
Historical Data

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

Amount of rainfall in mm during May in Mariehamn based on historical data.
Last Year
Historical Data
Typically, there is a 13% chance of rain on an average day in May, with total rainfall of approximately 19 mm. The maximum amount of rainfall per day is around 9 mm, which is considered light rain. Mariehamn is amazing in May with as little as 4 rainy days on average, so plan adventures in the great outdoors.
Here’s how May is compared with other months in the amount of precipitation, total mm:
Mariehamn wettest month is October, where a typical day has a 55% chance of precipitation and 64 mm of rainfall per day. February, on the other hand, is the driest month with a mere 7% chance of precipitation and 7 mm of rainfall per day.

How was the weather last May in Mariehamn?

This is the weather in Mariehamn in May 2023:
1 May
☀️
+5°C
2 May
🌧️
+6°C
3 May
☀️
+5°C
4 May
☀️
+4°C
5 May
☀️
+4°C
6 May
☀️
+5°C
7 May
☀️
+6°C
8 May
☀️
+8°C
9 May
☀️
+8°C
10 May
☀️
+9°C
11 May
☀️
+11°C
12 May
☀️
+12°C
13 May
☀️
+14°C
14 May
☀️
+12°C
15 May
☀️
+12°C
16 May
🌧️
+10°C
17 May
🌧️
+9°C
18 May
☀️
+9°C
19 May
☀️
+11°C
20 May
☀️
+11°C
21 May
☀️
+12°C
22 May
☁️
+12°C
23 May
☀️
+13°C
24 May
☀️
+15°C
25 May
☀️
+14°C
26 May
☀️
+11°C
27 May
☀️
+11°C
28 May
☀️
+12°C
29 May
☀️
+10°C
30 May
☀️
+12°C
31 May
☀️
+14°C
In May 2023 Mariehamn had 27 sunny days, 1 cloudy days, and 3 rainy days. The average maximum temperature was +10°C, with an absolute maximum of +15°C and a minimum of +4°C. The average humidity was 80%, with a maximum of 100% and a minimum of 57%. The average wind speed was 4 m/s, with a maximum of 11 m/s and a minimum of 0 m/s.
Are you planning a trip in May?

Climate Change over Years

This is how Mariehamn climate have been changing during last 43 years period.

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

Frequently asked questions about the weather in Mariehamn in May:

Is May a good time to visit Mariehamn?

It’s always a good time to visit Mariehamn, but the weather is changeable in May, so plan a mix of indoor and outdoor activities and exploring, and pack for every eventuality.

Can you sunbathe in Mariehamn in May?

Not really, May is not the best time to sunbathe, unless you visit a local solarium.

Is Mariehamn rainy in May?

Mariehamn is usually dry in May. Plan your packing around outdoor activities and exploring.

Is it sunny in Mariehamn in May?

The amount of sunny days in Mariehamn during May varies; prepare for a mix of clouds and sun.

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.