Mexico City weather by month
Mexico City runs from about 15°C in January to 23°C in May, with July the wettest month at 316 mm.
warmest month
May
23°C
coolest month
January
15°C
wettest month
July
316 mm
worst air month
January
34 µg/m³
The whole year, month by month.
| Month | Avg temp | Rain | Sun | PM2.5 |
|---|---|---|---|---|
| January | 15°C | 0 mm | 294 h | 34 |
| February | 16°C | 11 mm | 304 h | 27 |
| March | 20°C | 0 mm | 360 h | 28 |
| April | 21°C | 9 mm | 363 h | 26 |
| May | 23°C | 39 mm | 380 h | 26 |
| June | 20°C | 183 mm | 331 h | 20 |
| July | 17°C | 316 mm | 332 h | 33 |
| August | 17°C | 292 mm | 332 h | 30 |
| September | 17°C | 286 mm | 275 h | 25 |
| October | 15°C | 103 mm | 282 h | 25 |
| November | 17°C | 7 mm | 323 h | 28 |
| December | 15°C | 8 mm | 320 h | 33 |
About 3,896 hours of sun a year. Roughly 124 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 2026-05-22. Full method, licences and the list of sources we rejected are on the methodology page.