Fresno weather by month
Fresno runs from about 9°C in January to 33°C in July, with February the wettest month at 96 mm.
warmest month
July
33°C
coolest month
January
9°C
wettest month
February
96 mm
worst air month
December
21 µg/m³
The whole year, month by month.
| Month | Avg temp | Rain | Sun | PM2.5 |
|---|---|---|---|---|
| January | 9°C | 65 mm | 214 h | 15 |
| February | 10°C | 96 mm | 242 h | 12 |
| March | 13°C | 94 mm | 315 h | 12 |
| April | 16°C | 38 mm | 350 h | 8 |
| May | 22°C | 9 mm | 418 h | 9 |
| June | 29°C | 0 mm | 418 h | 8 |
| July | 33°C | 0 mm | 433 h | 9 |
| August | 30°C | 0 mm | 397 h | 12 |
| September | 27°C | 0 mm | 354 h | 21 |
| October | 22°C | 10 mm | 322 h | 10 |
| November | 12°C | 52 mm | 261 h | 15 |
| December | 10°C | 37 mm | 215 h | 21 |
About 3,939 hours of sun a year. Roughly 41 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.