Mariehamn Weather in August
August in Mariehamn sees daytime temperatures around 20°C (68°F) and lows of 15°C (59°F) at night. With around 60 mm (2.4 in) of rainfall expected, it's worth packing a rain jacket.
Rainfall in Mariehamn in August
Analyzing past climate data, one can expect approximately 14 days of rain, averaging 60 mm (2.4 in). Neither particularly heavy nor particularly frequent, the rain this month is about average. A light jacket should be enough on most wet days.
Temperature in Mariehamn in August
August is one of the better months to visit Mariehamn. Expect 20°C (68°F) during the day and 15°C (59°F) at night. August is part of summer. This creates a mild day-to-night pattern that is generally easy to manage with the right clothing. Nights cool down to 15°C (59°F), so a light jacket or extra layer is useful once the sun goes down. On the plus side, the cooler nights make for comfortable sleeping conditions. On average, it is the month with the highest temperature of the year.So this is a great month to visit if you prefer dry days with pleasant temperatures.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit Finland, check out our Mariehamn's climate page.
Mariehamn Temperature in August
Min Temperature
15°C (59°F)
Max Temperature
20°C (68°F)
Chance of Rain
46%
Precipitation
60 mm (2.4 in)
Rainy days
14 days
Daily Historical Temperatures
50-year average (1976-2025)
Based on our historical records, temperatures in Mariehamn typically drop from around 20°C (68°F) at the start of August to approximately 17°C (63°F) by the end. Nights are cool, with lows typically ranging from 10°C (50°F) to 14°C (57°F).
Average temperatures in August
Historical weather for Mariehamn in August
Browse day-by-day weather records for Mariehamn spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
Mariehamn historical weather extremes in August
Based on weather observations in Mariehamn between 1976 and 2025, these are the recorded extremes during August.
- The warmest day in August was on August 4, 2014, with a maximum of 28°C (82°F).
- On August 31, 1986, Mariehamn saw its coldest August day with temperatures maxing out at 10°C (50°F).
- The coldest night in August in Mariehamn was on August 21, 1977, with a minimum of 2°C (36°F).
Best Places in Finland in August
Find out more about the weather in Finland and which places have the best travel conditions in this month. See all of Finland in August →
perfect weather
pleasant
tolerable
unpleasant
poor
What to Wear in Mariehamn in August
For Mariehamn in August, you'll want flexible clothing. It's wise to pack cotton shirts, comfortable shorts, and a pair of jeans for cooler evenings. A light sweater or jacket is useful for air-conditioned spaces (like buses) or unexpected cool moments. Rain is likely on several days, so bring a good rain jacket.What To Do in Mariehamn in August
We rated the following activities from 1 (least suitable) to 10 (best) to do.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit Finland, check out our Mariehamn's climate page.
See the full Mariehamn climate overview or explore weather in Finland.
