UV Index
UV Index
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Today's UV index in Seattle, United States 
will be up to 3.5, 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 3.5 in Seattle, 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 Seattle varies throughout the year, with the highest levels typically occurring from May to August. Despite its northern location, the city's cloud cover and fog can result in a lower UV index compared to other parts of the country during the summer months.
Seattle has a marine west coast climate, characterized by mild, wet winters and cool, relatively dry summers. The city experiences two main seasons, with the majority of its annual precipitation falling between October and May. Summer is the driest season, but short showers can still occur.
Compared to its region and neighboring countries, Seattle's climate is quite unique. The city is much wetter than nearby Portland, Oregon and significantly less rainy than Vancouver, British Columbia. In contrast, cities in the southeastern United States and Mexico typically have hotter climates with higher humidity. Seattle's marine climate and lower temperatures are influenced by its coastal location and proximity to the Pacific Ocean.
The chart below displays the average Shortwave Radiation Sum (MJ/m²) for each month of the last year in Seattle. It's designed to provide you with a better understanding of the yearly weather and sun exposure.