UV Index
UV Index
Today's UV index in Mesa, United States 
will be up to 11.6, indicating a extreme level of sun exposure for the average person. Check our tips for today to make sure you're safe in the sun.
Last checked: 2025-06-22
UV index at 11.6 in Mesa means extreme risk: limit outdoor time especially from 10 a.m. to 4 p.m., actively seek shade, wear protective clothing, broad-brimmed hat, apply SPF 30+ sunscreen every 2 hours, and wear UV-blocking sunglasses. Watch for bright surfaces like water and snow increasing UV exposure.
Mesa has a high UV index, especially in summer, often reaching very dangerous levels above 10 during midday hours. Winter months have a lower UV index, but it remains moderate compared to many places.
Seasonally, summers are extremely hot and dry, with temperatures often above 100°F (38°C). Winters are mild and pleasant, with daytime temperatures around the 60s to 70s°F (15-25°C). Rainfall is sparse and mostly occurs during brief monsoon storms in late summer.
Compared to other places in Arizona, Mesa is hotter than northern cities like Flagstaff but similar to Phoenix since they are close. Compared to neighboring states, Mesa is much warmer and drier than northern New Mexico or Colorado, which get cooler and snowier winters.
See the UV index hour by hour for Mesa, along with the temperature and how cloudy it is. If the UV level is higher than moderate, it's best to avoid direct sunlight.