Climate averages 1991–2020
San Cristóbal de las Casas weather
in September.
A mild, very wet month: the 8th warmest and the 11th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
September is a mild month in San Cristóbal de las Casas: daytime highs average 20.3°C and nights cool to about 13.1°C. By daytime temperature it is the 8th warmest of the 12 months.
Expect about 429 mm of rain on roughly 26 days, which makes September a very wet month (the 11th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 12 h 15 min on an average September day.
The nearest other city in this atlas is Tuxtla (51 km away). In September its highs average 28.2°C, 7.9°C warmer than San Cristóbal de las Casas, with 341 mm of rain.
Among the 153 cities listed in Mexico, San Cristóbal de las Casas ranks joint 142nd of 153 for the warmest September highs and 152nd of 153 for the driest September (rainfall, lowest first). The mean September high of those 153 cities is 26.5°C; San Cristóbal de las Casas is 6.2°C cooler than that mean.
From September to October, average highs fall by 0.5°C to 19.9°C, and monthly rainfall falls from 429 mm to 230 mm.
The annual picture
September in context
Monthly rainfall
Average total · mmAverages from hourly ERA5 reanalysis data. Actual weather varies from year to year. How these numbers are calculated
Every month, side by side
San Cristóbal de las Casas climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 19.6°C9.7°C | 9.7°C | 12 | 2.6 | 11.211 h |
| February | 21.3°C10.1°C | 10.1°C | 7.3 | 1.8 | 11.612 h |
| March | 22.9°C11.0°C | 11.0°C | 17 | 3.7 | 12.012 h |
| April | 23.4°C12.2°C | 12.2°C | 50 | 8.6 | 12.513 h |
| May | 22.2°C13.0°C | 13.0°C | 223 | 19.2 | 12.913 h |
| June | 20.8°C13.3°C | 13.3°C | 486 | 25.7 | 13.113 h |
| July | 21.0°C12.8°C | 12.8°C | 300 | 21.6 | 13.013 h |
| August | 21.0°C12.9°C | 12.9°C | 363 | 23.2 | 12.713 h |
| September, selected | 20.3°C13.1°C | 13.1°C | 429 | 26.3 | 12.212 h |
| October | 19.9°C12.5°C | 12.5°C | 230 | 18.1 | 11.812 h |
| November | 19.5°C11.1°C | 11.1°C | 58 | 7.9 | 11.411 h |
| December | 19.7°C10.2°C | 10.2°C | 18 | 2.5 | 11.211 h |
Rainfall is the average of the 30 separate monthly totals. A rain day is a local calendar day with at least 1 mm of precipitation. Daylight is the calculated sunrise-to-sunset length, not measured sunshine.
Compare places
September in nearby cities
- Tuxtla in SeptemberMexico · 51 kmHigh 28.2°C · Low 21.3°C · 341 mm rain
- Comitán in SeptemberMexico · 76 kmHigh 23.5°C · Low 16.0°C · 355 mm rain
- Villahermosa in SeptemberMexico · 143 kmHigh 30.9°C · Low 24.3°C · 287 mm rain
- Cárdenas, Mexico in SeptemberMexico · 162 kmHigh 30.2°C · Low 23.8°C · 289 mm rain
- Paraiso in SeptemberMexico · 196 kmHigh 30.3°C · Low 24.5°C · 244 mm rain
- Huehuetenango in SeptemberGuatemala · 200 kmHigh 21.7°C · Low 12.9°C · 236 mm rain
- Tapachula in SeptemberMexico · 207 kmHigh 28.0°C · Low 20.9°C · 697 mm rain
- Malacatán in SeptemberGuatemala · 212 kmHigh 26.4°C · Low 18.4°C · 462 mm rain
Read the numbers correctly
Climate, not a promise.
These patterns help compare months. They cannot tell you the weather on a specific day of your trip.
Sources, method and limitsHow these numbers are made (what the highs, lows and rain days mean, the sources and the model cell used for San Cristóbal de las Casas) is explained once on the San Cristóbal de las Casas year overview and on the Sources, method and limits page.