Matsumoto weather by month
Matsumoto runs from about 2°C in January to 25°C in August, with May the wettest month at 225 mm.
warmest month
August
25°C
coolest month
January
2°C
wettest month
May
225 mm
worst air month
July
13 µg/m³
The whole year, month by month.
| Month | Avg temp | Rain | Sun | PM2.5 |
|---|---|---|---|---|
| January | 2°C | 61 mm | 232 h | 5 |
| February | 2°C | 132 mm | 208 h | 9 |
| March | 4°C | 181 mm | 249 h | 10 |
| April | 13°C | 115 mm | 263 h | 12 |
| May | 16°C | 225 mm | 280 h | 11 |
| June | 20°C | 207 mm | 297 h | 10 |
| July | 25°C | 178 mm | 278 h | 13 |
| August | 25°C | 125 mm | 320 h | 12 |
| September | 24°C | 32 mm | 292 h | 8 |
| October | 16°C | 155 mm | 235 h | 7 |
| November | 9°C | 124 mm | 235 h | 7 |
| December | 4°C | 48 mm | 236 h | 5 |
About 3,125 hours of sun a year. Roughly 160 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 2026-05-24. Full method, licences and the list of sources we rejected are on the methodology page.