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When is the best time to visit Mariehamn?
In general the best time to visit Mariehamn is probably July, when the weather is usually great. The hottest months are June, July, August, while the coldest months are January, February, March.
Depending on the activities you want to experience, you may choose different months to visit:
- In general, it’s pleasant to walk and do outdoor activities during July - August.
- If you want to avoid wet weather, then your choice is May, June, July with the lowest chance of rain.
Average weather in Mariehamn in different months
This is the average weather in Mariehamn for each month based on historic data:
July usually has good weather. Average maximum temperature reaches +19°C during July.
In January, February, March, April, May, June, August, September, October, November, December the weather is average. Expect around 107 rainy days, and the precipitation amounts to approximately 64 mm in October.
Climate in Mariehamn
Here is the detailed breakdown of the climate in Mariehamn for each month:
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Maximum Temperature | |||||||||||
| +9°C | +10°C | +15°C | +15°C | +21°C | +27°C | +30°C | +28°C | +24°C | +17°C | +16°C | +11°C |
| Average Maximum Temperature | |||||||||||
| 0°C | -1°C | +1°C | +5°C | +10°C | +15°C | +19°C | +18°C | +14°C | +9°C | +5°C | +2°C |
| Minimum Temperature | |||||||||||
| -28°C | -23°C | -18°C | -8°C | -5°C | 0°C | +6°C | +6°C | +1°C | -6°C | -11°C | -15°C |
| Avg. water temperature | |||||||||||
| - | - | - | - | - | - | - | - | - | - | - | - |
| Humidity, % | |||||||||||
| 83 | 84 | 84 | 84 | 84 | 85 | 84 | 83 | 81 | 81 | 82 | 82 |
| Rain, mm | |||||||||||
| 16 | 7 | 7 | 21 | 31 | 45 | 49 | 63 | 55 | 64 | 49 | 28 |
| Snow, mm | |||||||||||
| 31 | 21 | 22 | 9 | 1 | 0 | 0 | 0 | 0 | 2 | 14 | 29 |
| Average wind speed, m/s | |||||||||||
| 7 | 6 | 6 | 5 | 4 | 4 | 4 | 5 | 6 | 6 | 7 | 7 |
| Sunny Days | |||||||||||
| 1 | 2 | 5 | 7 | 10 | 9 | 9 | 7 | 4 | 3 | 1 | 1 |
| Cloud Days | |||||||||||
| 12 | 14 | 14 | 11 | 11 | 10 | 9 | 8 | 10 | 11 | 9 | 10 |
| Rainy Days | |||||||||||
| 4 | 2 | 3 | 7 | 10 | 11 | 12 | 16 | 15 | 17 | 14 | 8 |
| Snowy Days | |||||||||||
| 13 | 10 | 10 | 4 | 0 | 0 | 0 | 0 | 0 | 1 | 6 | 12 |
Average Temperature
Here are the average maximum and minimum temperatures in Mariehamn during the whole year:
The hottest month in Mariehamn is July with average maximum temperature going up to +19°C. The coldest month is February with the lowest temperatures of -4°C.
Humidity
The temperature feels different depending on humidity. Here is how humidity in Mariehamn looks throughout the year, in %:
The most humid month in Mariehamn is June with average humidity going up to 85%. The least humid month is September with an average humidity of 81%.
Rain
Amount of rainfall in mm. in Mariehamn during the whole year based on historical data:
The sunniest and driest month is May with approximately 10 sunny days and a total precipitation of around 31 mm. The rainiest and wettest month is October with approximately 17 rainy days and 64 mm of total precipitation.
Snow
Amount of snow in mm. in Mariehamn during the whole year based on historical data:
The snowiest month is January with approximately 13 snowy days.
FAQ
Frequently asked questions about the weather in Mariehamn:
What is the hottest month in Mariehamn?
The hottest month in Mariehamn is July with average maximum temperature of +19°C.
What is the coldest month in Mariehamn?
The coldest month in Mariehamn is February with minimum temperatures of -4°C.
Is Mariehamn worth visiting in winter?
Winter in Mariehamn could be a good time to visit, as the weather is generally ok.
When does it rain the least in Mariehamn?
if you're looking to visit Mariehamn when it rains the least, you should plan your trip for October, August, September. During this time, rainfall is rare with the driest month being February with only 7 mm of rain.
Monthly weather in Mariehamn
Source of the data
For this page, we’ve looked at the typical weather in Mariehamn, based on historical hourly weather data from January 1, 1979, to December 31, 2023.
For past dates, we show actual recorded data at the location at that time. Forecasts are based on recorded weather during that day of the year, averaged over the total years for which we have records (unless stated otherwise). The daily temperature is the highest recorded temperature in the shadow during that day.