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Weather in Mariehamn — today

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

Now in Mariehamn

☁️

+14°

Overcast

Feels like +13° · humidity 90%

Today 12.9: +16° / +13°

🕐 08:25

Wind

10 km/h

UV index

Air (AQI)

20 · Excellent

Precipitation

27%

Humidity

90%

Pressure

1016 hPa

Sunrise / sunset

07:00 / 20:10

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, 12 September, Saturday, in Mariehamn (Åland Islands): partly cloudy, moderately warm. During the day the air will warm up to +16°, at night around +13°. Due to the wind it feels like +13°. Wind up to 17 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 07:00 and set at 20:10 — daylight lasts 13 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 12.9

☁️

💧 27%

+13° +16°

Morning

☁️

+14°

Day

☁️

+16°

Evening

🌇

+15°

Night

🌙

+13°

Overcast · precipitation 27% · wind up to 17 km/h.
🙂 Mild, pleasant weather. A light sweater will come in handy in the evening.

▶

Tomorrow 13.9

🌦️

💧 65%

+11° +16°

Morning

🌦️

+14°

Day

🌦️

+16°

Evening

🌇

+15°

Night

🌙

+11°

Drizzle · precipitation 65% · wind up to 18 km/h.
🙂 Mild, pleasant weather. A light sweater will come in handy in the evening.

▶

Mon 14.9

☁️

+9° +16°

Morning

☁️

+12°

Day

☁️

+16°

Evening

🌇

+14°

Night

🌙

+9°

Overcast · precipitation 0% · wind up to 12 km/h.
🙂 Mild, pleasant weather. A light sweater will come in handy in the evening.

▶

Tue 15.9

🌦️

💧 37%

+7° +14°

Morning

🌦️

+10°

Day

🌦️

+14°

Evening

🌇

+12°

Night

🌙

+7°

Drizzle · precipitation 37% · wind up to 19 km/h.
🧥 Cool. You'll need a warm jacket; it can get chilly in the evening.

▶

Wed 16.9

🌦️

💧 64%

+13° +18°

Morning

🌦️

+15°

Day

🌦️

+18°

Evening

🌇

+17°

Night

🌙

+13°

Drizzle · precipitation 64% · wind up to 27 km/h.
🙂 Mild, pleasant weather. A light sweater will come in handy in the evening.

▶

Thu 17.9

☁️

💧 38%

+12° +17°

Morning

☁️

+14°

Day

☁️

+17°

Evening

🌇

+16°

Night

🌙

+12°

Overcast · precipitation 38% · wind up to 22 km/h.
🙂 Mild, pleasant weather. A light sweater will come in handy in the evening.

▶

Fri 18.9

🌦️

💧 52%

+12° +15°

Morning

🌦️

+13°

Day

🌦️

+15°

Evening

🌇

+14°

Night

🌙

+12°

Drizzle · precipitation 52% · wind up to 20 km/h.
🧥 Cool. You'll need a warm jacket; it can get chilly in the evening.

▶

Sat 19.9

🌦️

💧 36%

+13° +16°

Morning

🌦️

+14°

Day

🌦️

+16°

Evening

🌇

+15°

Night

🌙

+13°

Drizzle · precipitation 36% · wind up to 29 km/h.
🙂 Mild, pleasant weather. A light sweater will come in handy in the evening.

▶

Sun 20.9

🌦️

💧 38%

+12° +14°

Morning

🌦️

+13°

Day

🌦️

+14°

Evening

🌇

+14°

Night

🌙

+12°

Drizzle · precipitation 38% · wind up to 20 km/h.
🧥 Cool. You'll need a warm jacket; it can get chilly in the evening.

▶

Mon 21.9

🌦️

💧 35%

+10° +13°

Morning

🌦️

+11°

Day

🌦️

+13°

Evening

🌇

+12°

Night

🌙

+10°

Rain showers · precipitation 35% · wind up to 21 km/h.
🧥 Cool. You'll need a warm jacket; it can get chilly in the evening.

▶

Tue 22.9

☁️

💧 39%

+10° +13°

Morning

☁️

+11°

Day

☁️

+13°

Evening

🌇

+12°

Night

🌙

+10°

Overcast · precipitation 39% · wind up to 17 km/h.
🧥 Cool. You'll need a warm jacket; it can get chilly in the evening.

▶

Wed 23.9

🌦️

💧 37%

+9° +13°

Morning

🌦️

+10°

Day

🌦️

+13°

Evening

🌇

+12°

Night

🌙

+9°

Drizzle · precipitation 37% · wind up to 18 km/h.
🧥 Cool. You'll need a warm jacket; it can get chilly in the evening.

▶

Thu 24.9

🌦️

💧 49%

+8° +14°

Morning

🌦️

+10°

Day

🌦️

+14°

Evening

🌇

+13°

Night

🌙

+8°

Drizzle · precipitation 49% · wind up to 16 km/h.
🧥 Cool. You'll need a warm jacket; it can get chilly in the evening.

▶

Fri 25.9

☁️

💧 27%

+8° +15°

Morning

☁️

+11°

Day

☁️

+15°

Evening

🌇

+13°

Night

🌙

+8°

Overcast · precipitation 27% · wind up to 20 km/h.
🧥 Cool. You'll need a warm jacket; it can get chilly 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

71 / 100

comfort for running · Good

🧴 UV

moderate · low

☂️ Rain

27%

possible · low

✨ Stars

69 / 100

evening visibility · Good

🧺 Laundry drying

9 / 100

will dry outside · Bad

🚗 Car wash

63 / 100

no rain expected · Average

🌫️ Air quality

Excellent air

European AQI

PM2.5: 3PM10: 5O₃: 60NO₂: 3

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

🌅 Sun, moon and sea

Sunrise

07:00

Sunset

20:10

Golden hour

19:15

Daylight

13 h (-6 min vs yesterday)

Sea temperature

+16°

🌊 calm, waves 0.4 m.

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.