Tokyo weather by month
Tokyo runs from about 5°C in January to 29°C in August, with June the wettest month at 289 mm.
warmest month
August
29°C
coolest month
January
5°C
wettest month
June
289 mm
worst air month
December
37 µg/m³
The whole year, month by month.
| Month | Avg temp | Rain | Sun | PM2.5 |
|---|---|---|---|---|
| January | 5°C | 38 mm | 248 h | 32 |
| February | 7°C | 85 mm | 189 h | 33 |
| March | 8°C | 203 mm | 243 h | 26 |
| April | 16°C | 116 mm | 215 h | 23 |
| May | 19°C | 247 mm | 250 h | 20 |
| June | 22°C | 289 mm | 258 h | 22 |
| July | 28°C | 118 mm | 302 h | 16 |
| August | 29°C | 192 mm | 336 h | 25 |
| September | 26°C | 145 mm | 258 h | 22 |
| October | 20°C | 145 mm | 200 h | 23 |
| November | 13°C | 138 mm | 210 h | 37 |
| December | 7°C | 6 mm | 264 h | 37 |
About 2,973 hours of sun a year. Roughly 175 rainy days a year.
These are long-run climate normals, not a forecast. A given year can sit well outside them. PM2.5 is a global model: near the coast it counts sea salt as fine particulate and reads high against ground stations, sometimes by a factor of two. Use the shape of the year, not the absolute number.
where these numbers come from
- · Temperature, rainfall and sunshine: ECMWF ERA5 reanalysis climate normals via Open-Meteo (CC BY 4.0), fetched once and stored.
- · PM2.5: Copernicus CAMS reanalysis, monthly means. Modelled, not station readings; near coasts CAMS counts sea salt as PM2.5 and reads high.
Last reviewed 2026-05-22. Full method, licences and the list of sources we rejected are on the methodology page.