Yokohama weather by month
Yokohama runs from about 6°C in January to 29°C in August, with June the wettest month at 282 mm.
warmest month
August
29°C
coolest month
January
6°C
wettest month
June
282 mm
worst air month
December
37 µg/m³
The whole year, month by month.
| Month | Avg temp | Rain | Sun | PM2.5 |
|---|---|---|---|---|
| January | 6°C | 37 mm | 248 h | 32 |
| February | 7°C | 108 mm | 178 h | 33 |
| March | 9°C | 196 mm | 243 h | 26 |
| April | 16°C | 131 mm | 220 h | 23 |
| May | 19°C | 216 mm | 263 h | 20 |
| June | 22°C | 282 mm | 254 h | 22 |
| July | 28°C | 87 mm | 320 h | 16 |
| August | 29°C | 155 mm | 339 h | 25 |
| September | 26°C | 104 mm | 263 h | 22 |
| October | 20°C | 160 mm | 207 h | 23 |
| November | 13°C | 152 mm | 212 h | 37 |
| December | 8°C | 1 mm | 263 h | 37 |
About 3,010 hours of sun a year. Roughly 164 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 2026-05-23. Full method, licences and the list of sources we rejected are on the methodology page.