worldweather

Weather in Mariehamn - 14-day forecast

Detailed weather forecast for Mariehamn, Åland: daytime and night temperature, rain, sunrise and sunset - today and for the next two weeks.
Forecast for the next days in Mariehamn
today🌧️ 17°💧 0.7 mm
Sun🌧️ 16°💧 0.2 mm
Mon🌧️ 16°💧 0.7 mm
Tue🌧️ 16°💧 8.4 mm
Wed🌧️ 15°💧 1.6 mm
Thu🌧️ 14°💧 6.1 mm
Fri🌧️ 13°💧 0.9 mm
Sat🌧️ 15°💧 4.5 mm
Forecast vs 1991-2020 climate normal

How does the current forecast compare with normal?

We compare the coming days with weather usually observed at this time of year.

NASA POWER

Thursday 10 Sept in Mariehamn, the forecast high is 14°C. Typical daytime temperatures at this time of year range from 13°C to 17°C, so it will be cooler than usual. It is cooler than 75% of similar days.

17°Cwarmer than usual
usually 14°C–17°C
warmer than 74% of similar days
night: exceptionally cool rain: typical rainfall wind: typical
16°Cnear normal
usually 14°C–17°C
night: near normal rain: typical rainfall wind: typical
16°Cnear normal
usually 14°C–17°C
night: warmer than usual rain: typical rainfall wind: typical
16°Cnear normal
usually 14°C–17°C
night: exceptionally warm rain: exceptionally wet wind: typical
15°Cnear normal
usually 14°C–17°C
night: warmer than usual rain: typical rainfall wind: typical
14°Ccooler than usual
usually 13°C–17°C
cooler than 75% of similar days
night: warmer than usual rain: more rain than usual wind: typical
13°Ccooler than usual
usually 13°C–16°C
cooler than 74% of similar days
night: warmer than usual rain: typical rainfall wind: typical

How warm was this week in previous years?

Each bar shows the average daily high during the same 7-day period in each year.

swipe to see more years →
5°15°25° 1981: 15°C1982: 14°C1983: 14°C1984: 14°C1985: 13°C1986: 12°C1987: 14°C1988: 17°C1989: 15°C1990: 14°C1991: 12°C1992: 14°C1993: 12°C1994: 15°C1995: 15°C1996: 12°C1997: 16°C1998: 15°C1999: 18°C2000: 14°C2001: 15°C2002: 19°C2003: 16°C2004: 16°C2005: 15°C2006: 16°C2007: 14°C2008: 14°C2009: 16°C2010: 15°C2011: 16°C2012: 15°C2013: 17°C2014: 17°C2015: 15°C2016: 16°C2017: 14°C2018: 18°C2019: 17°C2020: 16°C2021: 16°C2022: 15°C2023: 18°C2024: 19°C2025: 18°C 2026 forecast: 15°C current forecast 15°C 198119902000201020202026
cooler yearstypical rangewarmer years2026 forecastcurrent forecast

From 1981 to 2025, the 5-11 Sept period averaged 15°C by day. The coolest year was 1986 (12°C) and the warmest was 2002 (19°C). The current forecast averages 15°C - close to the historical median.

Historical reference: NASA POWER daily gridded data (MERRA-2), the 1991-2020 normal and a +/- 7-day calendar window. The typical range is the 20th-80th percentile. This is not a city weather-station reading and does not change the current forecast. NASA POWER Daily API.

14-day forecast - Mariehamn

Mariehamn - 14-day weather forecast infographic

Mariehamn 30 & 45-day weather - long-range outlook

Next 16 days · forecast
15°
around 14° at night · days with rain: 7
Weeks 3-4 · avg for September
15°
around 8° at night · rain chance 50%
Weeks 5-7 · avg for October
10°
around 4° at night · rain chance 58%
The 30 & 45-day outlook for Mariehamn: the next 16 days are a numerical forecast updated daily - on average 15° by day and 14° at night. Further out we rely on multi-year climate averages: around 15° in September, and about 10° in October. Forecasts beyond two weeks are indicative only.

Day-by-day forecast for Mariehamn

Saturday5 September 2026
🌧️17°light rain
sunrise 06:43 · sunset 20:33 · night 8° · evening 15° · rain 0.65 mm · humidity 62% · wind 8 m/s · clouds 100%
Sunday6 September 2026
🌧️16°light rain
sunrise 06:46 · sunset 20:30 · night 14° · evening 15° · rain 0.22 mm · humidity 70% · wind 8 m/s · clouds 17%
Monday7 September 2026
🌧️16°light rain
sunrise 06:48 · sunset 20:27 · night 15° · evening 14° · rain 0.65 mm · humidity 74% · wind 8 m/s · clouds 97%
Tuesday8 September 2026
🌧️16°moderate rain
sunrise 06:50 · sunset 20:24 · night 15° · evening 15° · rain 8.44 mm · humidity 88% · wind 10 m/s · clouds 100%
Wednesday9 September 2026
🌧️15°light rain
sunrise 06:53 · sunset 20:21 · night 15° · evening 15° · rain 1.59 mm · humidity 77% · wind 8 m/s · clouds 92%
Thursday10 September 2026
🌧️14°light rain
sunrise 06:55 · sunset 20:18 · night 14° · evening 15° · rain 6.09 mm · humidity 82% · wind 10 m/s · clouds 74%
Friday11 September 2026
🌧️13°light rain
sunrise 06:57 · sunset 20:15 · night 14° · evening 15° · rain 0.87 mm · humidity 81% · wind 8 m/s · clouds 92%
Saturday12 September 2026
🌧️15°light rain
sunrise 07:00 · sunset 20:12 · night 14° · evening 14° · rain 4.5 mm · humidity 82% · wind 9 m/s · clouds 100%
Sunday13 September 2026
🌧️15°light rain
sunrise 07:02 · sunset 20:09 · night 14° · evening 13° · rain 7.53 mm · humidity 82% · wind 10 m/s · clouds 98%
Monday14 September 2026
☁️11°overcast clouds
sunrise 07:04 · sunset 20:06 · night 11° · evening 10° · rain 3.6 mm · humidity 56% · wind 12 m/s · clouds 100%
Tuesday15 September 2026
🌧️12°light rain
sunrise 07:07 · sunset 20:03 · night 13° · evening 14° · rain 0.15 mm · humidity 67% · wind 8 m/s · clouds 99%
Wednesday16 September 2026
☁️15°overcast clouds
sunrise 07:09 · sunset 20:00 · night 15° · evening 16° · rain 0.51 mm · humidity 77% · wind 9 m/s · clouds 100%
Thursday17 September 2026
☁️15°overcast clouds
sunrise 07:12 · sunset 19:57 · night 15° · evening 15° · rain 13.29 mm · humidity 80% · wind 7 m/s · clouds 100%
Friday18 September 2026
🌧️14°light rain
sunrise 07:14 · sunset 19:54 · night 14° · evening 15° · rain 0.48 mm · humidity 87% · wind 6 m/s · clouds 83%
Saturday19 September 2026
☁️16°broken clouds
sunrise 07:16 · sunset 19:51 · night 15° · evening 16° · humidity 84% · wind 8 m/s · clouds 74%
Sunday20 September 2026
☁️16°broken clouds
sunrise 07:19 · sunset 19:48 · night 15° · evening 16° · humidity 81% · wind 8 m/s · clouds 83%

UV index in Mariehamn - is it safe to sunbathe?

UV INDEX · 16-DAY FORECASTMariehamn03681111+3.3UV MODERATEtoday, daily maxSeek shade around midday. SPF 30+, sunglasses and ahat for longer stays.Unprotected fair skin may burn in about 60 min3Sat5.094Sun6.094Mon7.091Tue8.094Wed9.094Thu10.091Fri11.092Sat12.092Sun13.090Mon14.093Tue15.093Wed16.093Thu17.093Fri18.093Sat19.093Sun20.090-2 low3-5 moderate6-7 high8-10 very high11+ extremeworld-prices.com · 2026-09-05
Today the UV index in Mariehamn is 3 (moderate) - unprotected fair skin can burn in about 60 minutes. Seek shade around midday. SPF 30+, sunglasses and a hat for longer stays.

Sea temperature - Mariehamn

Water today
17°C
Week avg
16°C
Waves today
0.2 m
How's the water?
cold
16-day sea temperature forecast:
5.09 17°C6.09 16°C7.09 16°C8.09 16°C9.09 16°C10.09 16°C11.09 14°C12.09 14°C13.09 14°C
Average sea temperature through the year:
Jan 1°CFeb 1°CMar 2°CApr 4°CMay 9°CJun 15°CJul 19°CAug 18°CSep 16°COct 11°CNov 7°CDec 4°C
Sea-surface temperature from marine models, updated daily. See also: where the sea is warmest right now.

Mariehamn weather through the year

Mariehamn - annual climate

Warmest, driest months on average: May, June, July, August.

Upcoming public holidays in Åland: All Saints Day — 7 November · Independence Day — 6 December · Christmas Eve — 24 December.

Nearby and related places

UppsalaTurkuStockholmMoroniMaleNassauMalaboNukuʻalofaMajuro

FAQ - Mariehamn weather

What is the weather like in Mariehamn today?
Today it is about 17° during the day and 8° at night, light rain.
How far ahead can I check the forecast for Mariehamn?
This page shows a detailed 14-day forecast plus the long-term monthly climate, so you can plan both a short trip and a holiday months ahead.