SeasonMapMariehamn (Aland) weather in May
Åland Islands
May in Mariehamn: cold, a little rain, with clean air — a good time to visit.
#5 of 12 months in Mariehamn · #1041 of 1383 destinations to visit in May · comfort 69/100 (tier C)
Updated September 2026 · climate normals from ERA5 reanalysis
Traveller notes on Mariehamn in May
No notes yet. Open Mariehamn on the map to add the first one.
Mariehamn climate normals — May
| Daytime high | 10°C / 49°F | 🧥 cold |
|---|---|---|
| Nighttime low | 6°C / 43°F | |
| Sea temperature | 8°C / 46°F | 🥶 cold sea |
| Rainfall | 38 mm / 1.5 in | 🌦 some rain |
| Rainy days | 7 days | |
| Humidity | 72% | 💧 humid |
| Dew point | 4°C / 38°F | |
| Sunshine | 12.6 h/day | |
| Daylight | 17.2 h | |
| Wind | 22 km/h / 14 mph | |
| Snowfall | 0.8 cm / 0.3 in | |
| Air quality (US AQI) | 39 | 🍃 good |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
Crowds in Mariehamn in May
How busy the place itself is — school and mass holidays, the months an editor tagged, and how sought-after the weather makes them. Never part of the comfort score.
Shoulder seasonschool holidays in 4 of the markets that fill it, an ordinary month(estimated)
Peak crowdsBusyShoulder seasonQuiet
Best months for Mariehamn's weather
Ranked by this destination's own climate comfort score across the year — a different thing from how busy it gets (see Crowds above).
Fair weatherMariehamn's weather peaks June–August, best around July.
Best weatherFair weatherToughest weather
What's on in Mariehamn in May
Recurring seasonal events, natural spectacles, closures and holidays — curated and sourced.
- Opening
Archipelago summer season
15 May – 10 Sep · usuallySummer season opensThe inter-island ferries move to the full timetable, the guest harbours and the Pommern open up, and the cafes on Torggatan put tables outside. Outside this window a lot of it simply is not running. Source ↗
Nearby, and something's on
Within 300 km of Mariehamn — a day trip or a short hop — with something on this month. Never part of the comfort score.
Where is Mariehamn?
Mariehamn in May — FAQ
- Is May a good time to visit Mariehamn?
- May in Mariehamn: cold, a little rain, with clean air — a good time to visit. It ranks #5 of 12 months for Mariehamn on SeasonMap's comfort score (69/100).
- What is the weather like in Mariehamn in May?
- In May, Mariehamn averages a daily high of 9.5°C and a low of 6.2°C, with about 38 mm of rain over roughly 7.4 rainy days.
- What is the air quality in Mariehamn in May?
- Mariehamn has a mean US Air Quality Index of about 39 in May.
Other months in Mariehamn
Compare Mariehamn in May
Warmer or cooler than Mariehamn in May
Similar destinations in Northern Europe — May
Within 300 km: Helsinki's Vappu on 30 Apr – 1 May.