UV Index
UV Index
Today's UV index in Osaka, Japan 
will be up to 11.1, 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: 2025-06-21
UV index at 11.1 in Osaka 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.
Osaka's UV index is highest in summer, often reaching very high to extreme levels around July and August, and lowest in winter, typically low to moderate from December to February. Seasonal patterns include hot, humid summers with heavy rain due to the monsoon, and cool, mild winters with less precipitation. Compared to other parts of Japan, Osaka is warmer and wetter than northern regions like Hokkaido but cooler and less rainy than southern areas like Okinawa; it experiences more rainfall than most inland areas but less than some coastal zones.
See the UV index hour by hour for Osaka, along with the temperature and how cloudy it is. If the UV level is higher than moderate, it's best to avoid direct sunlight.