Mariehamn weather by month & the best time to visit
🇫🇮 Finland · seaside town · oceanic / maritime climate
The best time to visit Mariehamn is July — its sunniest month (Sunshine Score 66/100), with August close behind. Mariehamn averages about 1,841 hours of sunshine a year. Daytime highs around 18°C / 64°F and roughly 58 mm of rain in July.
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- Sun hours / year
- 1,841
- Sunniest month
- July
- Peak score
- 66/100
- Rain / year
- 649 mm
- Snow / year
- ≈68 cm
- Midday UV at peak
- 4 (moderate)
- Sea at warmest
- 19°C / 66°F
- Population
- 15k
- Elevation
- Sea level
When is the best time to visit Mariehamn?
For sunshine, the best time to visit Mariehamn is July, then August. The dullest month is January (0/100, 53 mm of rain). The full month-by-month picture is in the table below.
How sunny is Mariehamn?
Mariehamn gets a moderate 1,841 hours of sunshine a year. 66 Sunshine Score points separate July (66) from January (0), so the month you pick matters. It ranks #3 of 20 destinations in Finland for annual sunshine, above the national median of 1,638 hours. The year's 649 mm of rain spreads fairly evenly across the months, with no pronounced dry season.
Sunshine Score by month
| Month | Score | Day high | Night low | Rain | UV | Sea |
|---|---|---|---|---|---|---|
| January | 0 | 1° / 34°F | -1° / 30°F | 53 mm | 0 | 0° / 32°F |
| February | 0 | 0° / 32°F | -2° / 28°F | 40 mm | 0 | 0° / 32°F |
| March | 0 | 1° / 34°F | -1° / 30°F | 38 mm | 1 | 1° / 34°F |
| April | 0 | 5° / 41°F | 2° / 36°F | 36 mm | 2 | 3° / 37°F |
| May | 14 | 10° / 50°F | 6° / 43°F | 42 mm | 3 | 9° / 48°F |
| June | 39 | 14° / 57°F | 11° / 52°F | 58 mm | 4 | 16° / 61°F |
| July | 66 | 18° / 64°F | 16° / 61°F | 58 mm | 4 | 18° / 64°F |
| August | 65 | 18° / 64°F | 16° / 61°F | 64 mm | 3 | 19° / 66°F |
| September | 46 | 15° / 59°F | 12° / 54°F | 60 mm | 2 | 16° / 61°F |
| October | 6 | 9° / 48°F | 7° / 45°F | 70 mm | 1 | 11° / 52°F |
| November | 0 | 6° / 43°F | 4° / 39°F | 68 mm | 0 | 6° / 43°F |
| December | 0 | 3° / 37°F | 1° / 34°F | 62 mm | 0 | 3° / 37°F |
Sea temperature in Mariehamn by month
The sea off Mariehamn is warmest in August at around 19°C / 66°F, and coolest in January at 0°C / 32°F. It never reaches comfortable swimming temperatures (21°C+). Month-by-month sea-surface temperatures are in the Sea column of the table above.
See Mariehamn on the interactive sunshine globe →
Nearby places for sunshine
- Stockholm Sweden · 122 km · best in Jul · 1,710 h sun/yr
- Helsinki (Vantaa) Finland · 281 km · best in Jul · 1,584 h sun/yr
- Tallinn Estonia · 287 km · best in Jul · 1,693 h sun/yr
- Umeå Sweden · 409 km · best in Jul · 1,887 h sun/yr
- Riga Latvia · 427 km · best in Jul · 1,691 h sun/yr
- Oslo (Gardermoen) Norway · 487 km · best in Jul · 1,634 h sun/yr
Nearest destinations
- Turku Finland · 137 km · 1,640 h sun/yr · best in Jul
- Pori Finland · 181 km · 1,876 h sun/yr · best in Jul
- Stockholm / Västerås Sweden · 192 km · 1,709 h sun/yr · best in Aug
- Kärdla Estonia · 208 km · 1,751 h sun/yr · best in Jul
- Borlange Sweden · 244 km · 1,634 h sun/yr · best in Jul
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