SeasonMapMariehamn (Aland) weather by month
Åland Islands
The best time to visit Mariehamn (Aland) is June to August — 87/100 in July, 20°C and 7 rainy days. The best season is summer, June to August (83/100 on average).
The worst month is December at 24/100 — freezing, a little rain, clean air. See December →
Updated September 2026 · climate normals from ERA5 reanalysis
Mariehamn, month by month
Comfort score out of 100 for the kind of trip Mariehamn is best for, the average high, rainy days and hours of sun a day from the climate normals, and how busy it tends to be.
| Month | Score | Tier | High | Rain | Sun | Crowds | On |
|---|---|---|---|---|---|---|---|
| JanJanuary | 27 | F | 2°C | 11 d | 2 h | Peak | 1 |
| FebFebruary | 37 | F | 2°C | 8 d | 4 h | Shoulder | 1 |
| MarMarch | 51 | D | 4°C | 7 d | 7 h | Shoulder | 1 |
| AprApril | 63 | C | 7°C | 7 d | 11 h | Shoulder | 1 |
| MayMay | 76 | B | 13°C | 5 d | 13 h | Shoulder | 1 |
| JunJune | 82 | A | 18°C | 6 d | 15 h | Peak | 3 |
| JulJuly | 87 | A | 20°C | 7 d | 14 h | Busy | 1 |
| AugAugust | 80 | A | 19°C | 10 d | 12 h | Busy | 1 |
| SepSeptember | 73 | B | 16°C | 8 d | 9 h | Shoulder | 2 |
| OctOctober | 49 | F | 11°C | 13 d | 5 h | Shoulder | — |
| NovNovember | 34 | F | 6°C | 12 d | 2 h | Quiet | 1 |
| DecDecember | 24 | F | 3°C | 13 d | 1 h | Quiet | 1 |
What's on in Mariehamn through the year
Festivals, natural spectacles, holidays and the seasons to watch out for — curated and sourced. The month pages carry the detail.
Crowds in Mariehamn in July
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.
Busyschool holidays in 7 of the markets that fill it, one of its best months for weather(estimated)
Peak crowdsBusyShoulder seasonQuiet