Today, the UV index suggests low sun danger (0-2) in Tokyo, reaching up to 2.3. 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 Tokyo.
The UV index in Tokyo varies throughout the year, with the highest levels occurring during the summer months. In July and August, the UV index can reach as high as 10, which is considered very high (or extreme). During spring and autumn, the UV index is generally moderate, ranging from 4 to 6. It is crucial to protect yourself from the sun's rays by using sunscreen, wearing hats and sunglasses, and seeking shade during peak hours.
Tokyo experiences four distinct seasons: spring, summer, autumn, and winter. Spring (March to May) in Tokyo is mild, with temperatures ranging from 10 °C (50 °F) to 20 °C (68 °F). It is a beautiful time to visit as cherry blossoms bloom across the city. Summer (June to August) is hot and humid, with temperatures averaging around 25 °C (77 °F), but often reaching over 30 °C (86 °F). Autumn (September to November) brings cooler temperatures, ranging from 15 °C (59 °F) to 25 °C (77 °F), and colorful foliage. Winter (December to February) is cold, with temperatures ranging from 0 °C (32 °F) to 10 °C (50 °F), and occasional snowfall.
Compared to other regions of Japan, Tokyo generally receives more sunshine throughout the year. This is partly due to its location in the Kanto region, which has a lower average annual precipitation compared to other areas. The city is also less prone to typhoons compared to western Japan. However, it is important to note that sun exposure can still be harmful, and taking proper precautions to protect your skin is essential regardless of the region you are visiting in Japan.
The chart above displays the Shortwave Radiation Sum (MJ/m²) for each day of the last year in Tokyo. It's designed to provide you with a better understanding of the yearly weather and sun exposure.