Guadalajara weather by month
Guadalajara runs from about 18°C in January to 27°C in May, with July the wettest month at 154 mm.
warmest month
May
27°C
coolest month
January
18°C
wettest month
July
154 mm
worst air month
July
16 µg/m³
The whole year, month by month.
| Month | Avg temp | Rain | Sun | PM2.5 |
|---|---|---|---|---|
| January | 18°C | 2 mm | 296 h | 15 |
| February | 19°C | 34 mm | 278 h | 12 |
| March | 22°C | 0 mm | 367 h | 13 |
| April | 24°C | 0 mm | 358 h | 12 |
| May | 27°C | 0 mm | 390 h | 15 |
| June | 25°C | 145 mm | 340 h | 14 |
| July | 21°C | 154 mm | 317 h | 16 |
| August | 21°C | 147 mm | 318 h | 14 |
| September | 22°C | 92 mm | 326 h | 13 |
| October | 21°C | 27 mm | 331 h | 13 |
| November | 22°C | 0 mm | 325 h | 14 |
| December | 20°C | 1 mm | 324 h | 14 |
About 3,970 hours of sun a year. Roughly 60 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.