
🇫🇮Helsinki
| 11 Sep Fri | 12 Sep Sat | 13 Sep Sun | 14 Sep Mon | 15 Sep Tue | 16 Sep Wed | 17 Sep Thu | |
|---|---|---|---|---|---|---|---|
| Temp (°C) | 17° 7° | 17° 10° | 17° 8° | 17° 7° | 16° 7° | 16° 11° | 16° 8° |
| Precipitation | 15% | 37% | 72% | 10% | 79% | 71% | 89% |
| Humidity | 69% | 82% | 78% | 69% | 79% | 76% | 80% |
| Wind | 15 km/h | 16 km/h | 15 km/h | 12 km/h | 21 km/h | 17 km/h | 21 km/h |
The best time to visit Mariehamn is June to August, when mild temperatures and long daylight support cycling, hiking and coastal sightseeing. May and September are cooler alternatives for walking and exploring town, while October to April bring shorter days, colder conditions and more limited outdoor plans.
January is wintry and windy, around -5°C to 0°C, with snow and frequent cloud. Short walks and indoor sightseeing suit the limited daylight.
February is snowy and windy, around -6°C to -1°C. Winter clothing suits outdoor sightseeing, while short daylight favours compact plans.
March is chilly and breezy, around -4°C to 2°C, with snow lingering in places. Brisk walks are possible during relatively dry spells.
April is cool and breezy, around 0°C to 8°C, with spring scenery emerging. Layers suit town sightseeing and coastal walks.
May is fresh and mild, around 5°C to 14°C, with cycling and walking possible in layered clothing. Windy spells affect exposed coastal routes.
June is mild, around 10°C to 18°C, with long daylight for cycling, hiking and coastal sightseeing. Sea breezes can make exposed areas brisk.
July is mild and often clear, around 12°C to 20°C, supporting cycling, hiking and coastal outings. Wind remains possible on exposed routes.
August is mild, around 11°C to 19°C, with frequent rain. Cycling, island walks and coastal sightseeing suit flexible plans.
September is cool and breezy, around 7°C to 15°C, with autumn scenery across the islands. Walking and town sightseeing suit warm layers.
October is chilly and windy, around 3°C to 10°C, with short days and autumn weather. Town sightseeing and brisk walks fit the conditions.
November is cold and unsettled, around -1°C to 5°C, with strong winds and limited daylight. Indoor sightseeing and short excursions suit the month.
December is wintry and windy, around -4°C to 1°C, with snow possible and very short days. Seasonal atmosphere and quiet town visits suit the conditions.
Sources: weatherspark.com, easeweather.com

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