San Cristobal de las Casas weather by month
San Cristobal de las Casas runs from about 14°C in November to 18°C in May, with June the wettest month at 550 mm.
warmest month
May
18°C
coolest month
November
14°C
wettest month
June
550 mm
worst air month
May
22 µg/m³
The whole year, month by month.
| Month | Avg temp | Rain | Sun | PM2.5 |
|---|---|---|---|---|
| January | 15°C | 15 mm | 325 h | 7 |
| February | 15°C | 16 mm | 313 h | 10 |
| March | 17°C | 34 mm | 353 h | 10 |
| April | 17°C | 68 mm | 349 h | 15 |
| May | 18°C | 142 mm | 351 h | 22 |
| June | 16°C | 550 mm | 232 h | 10 |
| July | 16°C | 255 mm | 309 h | 11 |
| August | 16°C | 210 mm | 316 h | 11 |
| September | 15°C | 375 mm | 289 h | 12 |
| October | 15°C | 147 mm | 296 h | 10 |
| November | 14°C | 93 mm | 305 h | 9 |
| December | 14°C | 46 mm | 301 h | 7 |
About 3,739 hours of sun a year. Roughly 164 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 2026-05-25. Full method, licences and the list of sources we rejected are on the methodology page.