Tucson weather by month
Tucson runs from about 10°C in January to 33°C in July, with March the wettest month at 78 mm.
warmest month
July
33°C
coolest month
January
10°C
wettest month
March
78 mm
worst air month
July
6 µg/m³
The whole year, month by month.
| Month | Avg temp | Rain | Sun | PM2.5 |
|---|---|---|---|---|
| January | 10°C | 68 mm | 269 h | 5 |
| February | 12°C | 53 mm | 276 h | 5 |
| March | 14°C | 78 mm | 320 h | 5 |
| April | 20°C | 16 mm | 373 h | 4 |
| May | 26°C | 0 mm | 405 h | 4 |
| June | 32°C | 8 mm | 364 h | 5 |
| July | 33°C | 34 mm | 374 h | 6 |
| August | 31°C | 24 mm | 373 h | 5 |
| September | 30°C | 24 mm | 357 h | 4 |
| October | 26°C | 2 mm | 331 h | 4 |
| November | 14°C | 14 mm | 278 h | 4 |
| December | 14°C | 1 mm | 292 h | 5 |
About 4,012 hours of sun a year. Roughly 31 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.