UV Index
UV Index
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Today's UV index in Portland, United States 
will be up to 0.9, indicating low risk of harm from the sun's UV rays for the average person. Check our tips for today to make sure you're safe in the sun.
Today, the UV index suggests low sun danger (0-2) in Portland, reaching up to 0.9. Remember sunglasses and SPF 30+ on sunny days, and be cautious around reflective surfaces like sand, water, and snow for increased UV exposure.
Read more here about the climate and sun exposure in and around Portland.
The UV index in Portland ranges from low to moderate, typically reaching a maximum of 5 to 6 during the summer months. This means there is a moderate risk of harm from unprotected sun exposure, so it is advisable to wear sunscreen, sunglasses, and protective clothing when outdoors for an extended period of time.
Portland experiences four distinct weather seasons. In spring (March to May), temperatures range from around 7 °C (45 °F) to 18 °C (65 °F), with occasional rainfall. Summer (June to August) brings pleasant temperatures averaging between 16 °C (61 °F) and 26 °C (79 °F), along with drier conditions. Fall (September to November) sees temperatures dropping to around 6 °C (43 °F) to 18 °C (65 °F) and increasing rain. Winter (December to February) is chilly, with temperatures ranging between 0 °C (32 °F) and 10 °C (50 °F), and occasional snowfall.
Compared to its region, Portland has cooler summers and milder winters due to its proximity to the Pacific Ocean. This maritime influence moderates temperature extremes. However, the region does see less sunshine compared to other areas. Portland receives approximately 144 sunny days per year, which is lower than the national average. Despite this, the city enjoys a mild climate overall, making it suitable for various outdoor activities throughout the year.
The chart above displays the Shortwave Radiation Sum (MJ/m²) for each day of the last year in Portland. It's designed to provide you with a better understanding of the yearly weather and sun exposure.