UV Index
UV Index
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Today's UV index in Mariehamn, Åland Islands 
will be up to 3.1, indicating a moderate level of sun exposure for the average person. Check the annual sun radiation in the city and our tips for today to make sure you're safe in the sun.
With a UV index reaching up to 3.1 in Mariehamn, stay shaded during midday when the sun is strongest; wear protective clothing, a wide-brimmed hat, UV-blocking sunglasses; apply SPF 30+ sunscreen every 2 hours, even on cloudy days; and be cautious of heightened UV on bright surfaces.
The UV index in Mariehamn, Åland Islands can reach a high of 7 during the summer months. In winter, the UV index is generally low, rarely exceeding 1.
Mariehamn experiences four distinct seasons. Spring is mild and sunny, summer brings long daylight hours and warm temperatures, autumn is cool and colorful, and winter is snowy with short daylight hours.
Compared to its region and neighboring countries, Mariehamn has a milder climate due to its coastal location and the moderating effects of the Baltic Sea. While nearby Sweden and Finland can have very cold winters, Mariehamn's winter temperatures are generally less extreme.
The chart below displays the average Shortwave Radiation Sum (MJ/m²) for each month of the last year in Mariehamn. It's designed to provide you with a better understanding of the yearly weather and sun exposure.