UV Index
UV Index
Today's UV index in Hillsboro, United States 
will be up to 7.4, 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: 2025-06-20
With Hillsboro's UV index reaching 7.4, 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 Hillsboro, United States, varies throughout the year, generally ranging from low to moderate levels, with higher values during summer months. Peaks can reach up to 8 or 9 in the hottest months.
Hillsboro experiences mild, wet winters and warm, dry summers. Rain is common from October to April, while July and August are the driest and sunniest. Temperatures rarely drop below freezing in winter and often reach the 80s Fahrenheit in summer.
Compared to nearby Portland and the broader Pacific Northwest, Hillsboro has a similar climate with slightly more sunshine in summer. It is wetter and cooler than many parts of California to the south but milder than the inland areas east of the Cascade Mountains.
See the UV index hour by hour for Hillsboro, along with the temperature and how cloudy it is. If the UV level is higher than moderate, it's best to avoid direct sunlight.