UV Index
UV Index
Today's UV index in Tokyo, Japan 
will be up to 11, 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: 2025-06-23
UV index at 11 in Tokyo 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.
Tokyo's UV index is highest in summer, often reaching levels 7 to 9, indicating strong sunlight. It is lowest in winter, usually around 1 to 2, showing weak sunlight exposure during those months.
Tokyo experiences four distinct seasons: hot, humid summers with frequent rain and typhoons; cool, dry winters with occasional snow; mild springs with cherry blossoms; and colorful autumns with falling leaves.
Compared to other places in Japan, Tokyo has milder winters than northern areas like Hokkaido but hotter summers than northern Honshu. Neighboring countries like South Korea and China share similar seasonal weather, but Tokyo's coastal location makes its climate more humid.
See the UV index hour by hour for Tokyo, along with the temperature and how cloudy it is. If the UV level is higher than moderate, it's best to avoid direct sunlight.