Phoenix weather by month
Phoenix runs from about 11°C in January to 37°C in July, with February the wettest month at 57 mm.
warmest month
July
37°C
coolest month
January
11°C
wettest month
February
57 mm
worst air month
December
15 µg/m³
The whole year, month by month.
| Month | Avg temp | Rain | Sun | PM2.5 |
|---|---|---|---|---|
| January | 11°C | 46 mm | 237 h | 14 |
| February | 13°C | 57 mm | 269 h | 12 |
| March | 16°C | 41 mm | 325 h | 13 |
| April | 22°C | 5 mm | 371 h | 11 |
| May | 28°C | 0 mm | 398 h | 12 |
| June | 35°C | 0 mm | 379 h | 13 |
| July | 37°C | 5 mm | 392 h | 12 |
| August | 36°C | 12 mm | 382 h | 12 |
| September | 33°C | 0 mm | 356 h | 10 |
| October | 27°C | 7 mm | 329 h | 12 |
| November | 16°C | 2 mm | 284 h | 15 |
| December | 15°C | 0 mm | 278 h | 15 |
About 4,000 hours of sun a year. Roughly 19 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.