UV index in Tokyo
Japan · typical UV by month
Today's UV in Tokyo
The hourly forecast and the lower-UV times for what you do outside. Free, no account needed.
The year at a glance
- UV in Tokyo is highest in August, when a typical day peaks around 8 (Very high).
- On a typical August day, UV is 3 or more from about 8am to 4pm, about 7 hours.
- The typical midday UV reaches 3 or more from February to November, when public-health guidance recommends sun protection.
- UV usually stays under 3 in December and January.
- Clouds take the most off in May: a typical peak of 6, against 8 under a clear sky. On a clear day, expect the higher number.
Typical UV by month
The highest UV index of a typical day, with clouds and under a clear sky, and the hours UV is usually 3 or more, from 2023 to 2025.
| Month | Typical peak | Clear sky | UV 3 or more |
|---|---|---|---|
| JanJanuary | 2 Low | 3 | Rarely |
| FebFebruary | 3 Moderate | 4 | 10am-2pm |
| MarMarch | 4 Moderate | 5 | 10am-3pm |
| AprApril | 5 Moderate | 7 | 9am-3pm |
| MayMay | 6 High | 8 | 9am-4pm |
| JunJune | 7 High | 9 | 8am-4pm |
| JulJuly | 8 Very high | 10 | 8am-4pm |
| AugAugust | 8 Very high | 9 | 8am-4pm |
| SepSeptember | 6 High | 8 | 9am-3pm |
| OctOctober | 4 Moderate | 6 | 9am-2pm |
| NovNovember | 3 Moderate | 3 | 11am-1pm |
| DecDecember | 2 Low | 2 | Rarely |
About these numbers
Averages of every day from 2023 to 2025 in the global atmospheric composition model of the Copernicus Atmosphere Monitoring Service, served by the Open-Meteo Air Quality API (CC BY 4.0), for the city center, in local time. They describe a typical day, not any one day: the UV on a given day can be higher or lower, so check the forecast before you go. Solara is a planning aid, not medical advice.