UV Index
UV Index
Today's UV index in Alonnisos, Greece 
will be up to 6.7, indicating a high level of sun exposure for the average person. Check our tips for today to make sure you're safe in the sun.
Last checked: 2025-05-10
With Alonnisos's UV index reaching 6.7, protect your skin from harm by staying in shade, wearing protective clothing, and applying SPF 30+ sunscreen every 2 hours, especially between 10 a.m. and 4 p.m. when UV rays are strongest.
The UV index in Alonnisos is generally high during summer, often reaching 9 or above, indicating strong sun exposure. In winter, the UV index drops to low or moderate levels, around 2 to 4.
Seasonally, Alonnisos has hot, dry summers with temperatures often above 30°C. Winters are mild and wetter, with temperatures usually between 10°C and 15°C. Spring and autumn are pleasant with moderate temperatures and less rain.
Compared to mainland Greece, Alonnisos has milder winters due to its island location. It tends to be cooler in summer than cities like Athens. Nearby islands have similar weather, but Alonnisos is usually a bit windier because of its position in the Aegean Sea.
See the UV index hour by hour for Alonnisos, along with the temperature and how cloudy it is. If the UV level is higher than moderate, it's best to avoid direct sunlight.