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This is something you might want to add to your bucket list. August is also the perfect time to visit Finland. The days are long and the temperature is amazing.
Mariehamn Weather in May
May in Mariehamn brings low temperatures, with daytime highs of 11°C (52°F) and nights around 6°C (43°F). Expect around 36 mm (1.4 in) of rainfall during the month.
Rainfall in Mariehamn in May
This month experiences about 10 days of rain according to historical data, averaging 36 mm (1.4 in). A fairly balanced picture this month, some wet days but nothing too extreme in terms of intensity.
Temperature in Mariehamn in May
In May, Mariehamn gets low temperatures, with highs of 11°C (52°F). Nights cool to around 6°C (43°F). Cold conditions persist throughout the day, so warm clothing is important from the moment you head outside. Nights fall to 6°C (43°F), which is cold enough to feel it indoors too. A good thick duvet makes all the difference for a comfortable night's sleep.Should you favor a climate that's both dry and comfortably warm, July and August typically offer the most agreeable circumstances. If you're seeking pleasant, dry and sunny weather somewhere else in the world, our weather planner can help you explore other options.
Mariehamn Temperature in May
Min Temperature
6°C (43°F)
Max Temperature
11°C (52°F)
Chance of Rain
33%
Precipitation
36 mm (1.4 in)
Rainy days
10 days
Mariehamn Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in Mariehamn - and find the best time to visit.
Daily Historical Temperatures
50-year average (1976-2025)
Based on our historical records, temperatures in Mariehamn typically rise from around 10°C (50°F) at the start of May to approximately 15°C (59°F) by the end. Nights are cold, with lows typically ranging from 2°C (36°F) to 7°C (45°F).
Average temperatures in May
Historical weather records for Mariehamn in May
Browse day-by-day weather records for Mariehamn spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
Mariehamn historical weather extremes in May
Our historical data for Mariehamn spans 1976 to 2026, revealing these weather extremes.
- The hottest May day on record in Mariehamn reached 26°C (79°F) (May 16, 2018).
- The lowest daytime temperature in May was 1°C (34°F), recorded on May 1, 1976.
- Mariehamn registered its coldest May night on May 2, 1976, with temperatures dropping to -6°C (21°F).
Best Places in Finland in May
Find out more about the weather in Finland and which places have the best travel conditions in this month. See all of Finland in May →
perfect weather
pleasant
tolerable
unpleasant
poor
Perfect weather is subjective. On this map perfect weather has been defined with temperatures between 20°C (68°F) and 29°C (84°F) and not too much precipitation (less than 90 mm (3.5 in) a month).
What to Wear in Mariehamn in May
The weather can swing between comfortable and chilly in May, so flexibility is key. Pack a variety of tops, at least one warm layer, and both shorts and long pants. This gives you options no matter what the day brings. Light rain is possible, so consider bringing a small umbrella or rain jacket.
What To Do in Mariehamn in May
We rated the following activities from 1 (least suitable) to 10 (best) to do.
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Cycling6/10 -
Walking6/10 -
Barbeque2/10 -
Camping5/10 -
Outdoor sports6/10
Mariehamn 3-Day Forecast
More climate data for Mariehamn
See the full Mariehamn climate overview or explore weather in Finland.
Popular in May
Where to go in May - average daytime high across popular destinations.
Tampere
15°C (59°F) Helsinki
16°C (61°F) Turku16°C (61°F) Vuokatti
13°C (55°F) Rovaniemi12°C (54°F) Äkäslompolo11°C (52°F) Ruka10°C (50°F) Levi10°C (50°F) Bucket list
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