Spokane weather by month
Spokane runs from about -3°C in January to 26°C in July, with November the wettest month at 101 mm.
warmest month
July
26°C
coolest month
January
-3°C
wettest month
November
101 mm
worst air month
September
17 µg/m³
The whole year, month by month.
| Month | Avg temp | Rain | Sun | PM2.5 |
|---|---|---|---|---|
| January | -3°C | 59 mm | 93 h | 10 |
| February | 1°C | 52 mm | 125 h | 9 |
| March | 4°C | 45 mm | 281 h | 5 |
| April | 8°C | 30 mm | 319 h | 6 |
| May | 13°C | 35 mm | 385 h | 6 |
| June | 17°C | 26 mm | 393 h | 5 |
| July | 26°C | 1 mm | 455 h | 6 |
| August | 22°C | 11 mm | 394 h | 8 |
| September | 19°C | 3 mm | 331 h | 17 |
| October | 10°C | 25 mm | 273 h | 5 |
| November | 3°C | 101 mm | 111 h | 8 |
| December | 1°C | 86 mm | 89 h | 5 |
About 3,249 hours of sun a year. Roughly 49 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.