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Weather in Mariehamn — today

Tomorrow Day after tomorrow 3 days Week 14 days Month forecast Weather archive

Now in Mariehamn

☁️

+18°

Overcast

Feels like +17° · humidity 77%

Today 14.8: +20° / +13°

🕐 23:25

Wind

19 km/h

UV index

Air (AQI)

33 · Good

Precipitation

22%

Humidity

77%

Pressure

1013 hPa

Sunrise / sunset

05:52 / 21:37

Sea temperature

🌊 +16°

👕 What to wear today

Comfortable — a T-shirt, a light sweater for the evening.

Weather for an activity:

🎣 fishing 🏖️ the beach 🏃 a run 📸 a photo shoot 🚶 a walk

Detailed weather information for Mariehamn

Today, 14 August, Friday, in Mariehamn (Åland Islands): partly cloudy, moderately warm. During the day the air will warm up to +20°, at night around +13°. Due to the wind it feels like +17°. Wind up to 19 km/h. Brief rain is possible — an umbrella won't hurt. A T-shirt is comfortable during the day, but take a light sweater or windbreaker for the evening. The water is cold, +16° — too chilly for swimming. The sun will rise at 05:52 and set at 21:37 — daylight lasts 16 hours.

Hourly weather in Mariehamn

💧 The bars at the bottom show the hourly precipitation probability. Shaded areas of the chart are the dark hours (before sunrise 🌅 and after sunset 🌇).

Weather in Mariehamn for 14 days

Tap a day to expand it by time of day and open the full forecast. The bar shows the range from the night low (left) to the day high (right).

▶

Today 14.8

☁️

💧 22%

+13° +20°

Morning

☁️

+16°

Day

☁️

+20°

Evening

🌇

+18°

Night

🌙

+13°

Overcast · precipitation 22% · wind up to 19 km/h.
🙂 Mild, pleasant weather. A light sweater will come in handy in the evening.

▶

Tomorrow 15.8

☁️

💧 20%

+17° +23°

Morning

☁️

+18°

Day

☁️

+23°

Evening

🌇

+19°

Night

🌙

+17°

Overcast · precipitation 20% · wind up to 21 km/h.
🙂 Mild, pleasant weather. A light sweater will come in handy in the evening.

▶

Sun 16.8

☁️

💧 96%

+15° +18°

Morning

☀️

+17°

Day

☁️

+18°

Evening

🌇

+16°

Night

🌙

+15°

Overcast · precipitation 96% · wind up to 31 km/h.
🙂 Mild, pleasant weather. A light sweater will come in handy in the evening.

▶

Mon 17.8

☁️

💧 2%

+14° +18°

Morning

☁️

+15°

Day

☁️

+18°

Evening

🌇

+17°

Night

🌙

+14°

Overcast · precipitation 2% · wind up to 19 km/h.
🙂 Mild, pleasant weather. A light sweater will come in handy in the evening.

▶

Tue 18.8

🌦️

💧 59%

+13° +18°

Morning

🌦️

+15°

Day

🌦️

+18°

Evening

🌇

+17°

Night

🌙

+13°

Drizzle · precipitation 59% · wind up to 13 km/h.
🙂 Mild, pleasant weather. A light sweater will come in handy in the evening.

▶

Wed 19.8

🌦️

💧 63%

+11° +18°

Morning

🌦️

+14°

Day

🌦️

+18°

Evening

🌇

+16°

Night

🌙

+11°

Drizzle · precipitation 63% · wind up to 11 km/h.
🙂 Mild, pleasant weather. A light sweater will come in handy in the evening.

▶

Thu 20.8

🌦️

💧 63%

+11° +19°

Morning

🌦️

+14°

Day

🌦️

+19°

Evening

🌇

+17°

Night

🌙

+11°

Drizzle · precipitation 63% · wind up to 13 km/h.
🙂 Mild, pleasant weather. A light sweater will come in handy in the evening.

▶

Fri 21.8

🌦️

💧 60%

+14° +18°

Morning

🌦️

+15°

Day

🌦️

+18°

Evening

🌇

+17°

Night

🌙

+14°

Drizzle · precipitation 60% · wind up to 16 km/h.
🙂 Mild, pleasant weather. A light sweater will come in handy in the evening.

▶

Sat 22.8

🌦️

💧 54%

+12° +17°

Morning

🌦️

+14°

Day

🌦️

+17°

Evening

🌇

+16°

Night

🌙

+12°

Drizzle · precipitation 54% · wind up to 14 km/h.
🙂 Mild, pleasant weather. A light sweater will come in handy in the evening.

▶

Sun 23.8

🌦️

💧 40%

+13° +16°

Morning

🌦️

+14°

Day

🌦️

+16°

Evening

🌇

+15°

Night

🌙

+13°

Drizzle · precipitation 40% · wind up to 24 km/h.
🙂 Mild, pleasant weather. A light sweater will come in handy in the evening.

▶

Mon 24.8

☁️

💧 34%

+12° +16°

Morning

☁️

+13°

Day

☁️

+16°

Evening

🌇

+15°

Night

🌙

+12°

Overcast · precipitation 34% · wind up to 9 km/h.
🙂 Mild, pleasant weather. A light sweater will come in handy in the evening.

▶

Tue 25.8

☁️

💧 47%

+10° +15°

Morning

☁️

+12°

Day

☁️

+15°

Evening

🌇

+14°

Night

🌙

+10°

Overcast · precipitation 47% · wind up to 16 km/h.
🧥 Cool. You'll need a warm jacket; it can get chilly in the evening.

▶

Wed 26.8

☁️

💧 36%

+9° +17°

Morning

☁️

+12°

Day

☁️

+17°

Evening

🌇

+15°

Night

🌙

+9°

Overcast · precipitation 36% · wind up to 7 km/h.
🙂 Mild, pleasant weather. A light sweater will come in handy in the evening.

▶

Thu 27.8

⛅

💧 37%

+10° +19°

Morning

⛅

+13°

Day

⛅

+19°

Evening

🌇

+17°

Night

🌙

+10°

Partly cloudy · precipitation 37% · wind up to 13 km/h.
🙂 Mild, pleasant weather. A light sweater will come in handy in the evening.

🗺️ Precipitation radar

Precipitation radar (RainViewer) over a clean base map — updates every 5–10 minutes. Colours show nearby precipitation; if there is none, the map is simply clear — that is normal. Zoom with + / −.

Rain intensity:lightmoderateheavy

🎯 What to do in this weather — indices of the day

Comfort score from 0 (bad) to 100 (excellent), calculated from the day's weather. For “rain” and “UV” a percentage/risk level is shown.

🏖️ Beach

0 / 100

for sea and sun · Bad

🏊 Swimming

0 / 100

water 16° · Bad

🏃 Running

72 / 100

comfort for running · Good

🧴 UV

moderate · low

☂️ Rain

22%

possible · low

✨ Stars

73 / 100

evening visibility · Good

🧺 Laundry drying

22 / 100

will dry outside · So-so

🚗 Car wash

69 / 100

no rain expected · Good

🌫️ Air quality and pollen

Good air

European AQI

PM2.5: 6PM10: 10O₃: 83NO₂: 4 pollen: low

The air is clean — you can walk and exercise outside.

🌅 Sun, moon and sea

Sunrise

05:52

Sunset

21:37

Golden hour

20:37

Daylight

16 h (-5 min vs yesterday)

Sea temperature

+16°

🌊 slight, waves 0.7 m.

🌌 Northern lights: Kp index 4 — faint aurora possible outside the city after midnight. Data: NOAA SWPC.

Mariehamn climate by month

Long-term averages. Hover over a bar for details. The forecast for a specific month is a combination of the climate normal and the model forecast for the coming weeks.

+1°

-2°

Jan

+0°

-3°

Feb

+2°

-2°

Mar

+5°

+2°

Apr

+10°

+6°

May

+15°

+11°

Jun

+19°

+15°

Jul

+18°

+15°

Aug

+14°

+12°

Sep

+9°

+7°

Oct

+5°

+3°

Nov

+3°

+0°

Dec

swipe sideways →

Bar color shows temperature:frostcoolcomfortablewarmhot— best months to visit

Month	Day	Night	Sea	Precipitation	What to pack and what makes the month notable (events, nuances)
January	+1°	-2°	+1°	37 mm	The coldest stretch: +1° by day, full winter clothing required. ❄️ a warm jacket, a hat, non-slip shoes. The water is cold (+1°) — swimming is for the brave.
February	+0°	-3°	+1°	28 mm	Freezing: +0° by day, -3° at night — full winter gear, ice underfoot is common. ❄️ a warm jacket, a hat, non-slip shoes. The water is cold (+1°) — swimming is for the brave. This is the coldest month of the year.
March	+2°	-2°	+1°	28 mm	Proper winter: +2° daytime, frost and short days. ❄️ a warm jacket, a hat, non-slip shoes. The water is cold (+1°) — swimming is for the brave.
April	+5°	+2°	+4°	30 mm	A cold month: +5° by day, long walks get uncomfortable. 🧣 a warmer jacket. The water is cold (+4°) — swimming is for the brave.
May	+10°	+6°	+8°	36 mm	Cool: around +10° by day, you'll need a warm layer. 🧥 a warm jacket. The water is cold (+8°) — swimming is for the brave.
June	+15°	+11°	+14°	50 mm	A fresh month — +15° daytime, take a jacket for walks. 🧥 a warm jacket. The water is cold (+14°) — swimming is for the brave. The longest daylight hours of the year — more time for everything.
July	+19°	+15°	+18°	51 mm	The most pleasant season: +19° by day, comfortable all day long. 🙂 a sweater for the evening. Sea at +18° — swimmable, refreshing. This is the hottest month of the year in Mariehamn.
August	+18°	+15°	+18°	55 mm	One of the best times to visit: +18° by day, fresh nights. 🙂 a sweater for the evening. Sea at +18° — swimmable, refreshing. Weather-wise, one of the three best months to visit.
September	+14°	+12°	+16°	47 mm	A fresh month — +14° daytime, take a jacket for walks. 🧥 a warm jacket. The water is cold (+16°) — swimming is for the brave.
October	+9°	+7°	+11°	51 mm	A cold month: +9° by day, long walks get uncomfortable. 🧥 a warm jacket. The water is cold (+11°) — swimming is for the brave.
November	+5°	+3°	+7°	49 mm	Cold: +5° by day, down to +3° at night — dress warmly. 🧣 a warmer jacket. The water is cold (+7°) — swimming is for the brave.
December	+3°	+0°	+3°	47 mm	Winter weather: about +3° daytime, you need a warm coat and hat. ❄️ a warm jacket, a hat, non-slip shoes. The water is cold (+3°) — swimming is for the brave. The shortest daylight of the year — it gets dark early.

When to visit Mariehamn

✅ Recommended time to visit

🌟 Best time: June, July, August

Daytime air+15…+19°

Sea temperature+14…+18°

Precipitationoften

Featurewhite nights

Why: comfortable +15…+19° by day, little rain.

⚠️ Doable, with caveats

🌤️ Shoulder season: January, February, March, May, September, October

Daytime air+0…+14°

Sea temperature+1…+16°

Precipitationoften

Why: cool (+0…+14°) — not beach season, but great for city sights and museums.

🔴 Not the best time

❄️ Cold season: April, November, December

Daytime air+3…+5°

Sea temperature+3…+7°

Precipitationoften

Why: cold and dark (+3…+5° by day, 6 h of daylight) — only if frost and short days don’t put you off.

Bottom line: the best time to visit Mariehamn is June – August, and the most comfortable months are June, July, August. The toughest months to visit are April, November, December: cold and short days.