San Cristóbal de las Casas weather in September
September in San Cristóbal de las Casas: nice, soaked, with clean air — fine if you can take 26 rainy days.
#12 of 12 months in San Cristóbal de las Casas · #651 of 897 destinations to visit in September · comfort 71/100 (tier B)
Updated June 2026 · climate normals from ERA5 reanalysis
Traveller notes on San Cristóbal de las Casas in September
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San Cristóbal de las Casas climate normals — September
| Daytime high | 21°C / 70°F | 😎 nice |
|---|---|---|
| Nighttime low | 14°C / 57°F | |
| Rainfall | 428 mm / 16.9 in | ⛈ soaked |
| Rainy days | 26 days | |
| Humidity | 87% | 💦 very humid |
| Dew point | 14°C / 58°F | |
| Sunshine | 9.2 h/day | |
| Daylight | 12.2 h | |
| Wind | 6 km/h / 4 mph | |
| Air quality (US AQI) | 28 | 🍃 good |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
Where is San Cristóbal de las Casas?
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San Cristóbal de las Casas in September — FAQ
- Is September a good time to visit San Cristóbal de las Casas?
- September in San Cristóbal de las Casas: nice, soaked, with clean air — fine if you can take 26 rainy days. It ranks #12 of 12 months for San Cristóbal de las Casas on SeasonMap's comfort score (71/100).
- What is the weather like in San Cristóbal de las Casas in September?
- In September, San Cristóbal de las Casas averages a daily high of 21.2°C and a low of 13.8°C, with about 428.1 mm of rain over roughly 25.6 rainy days.
- What is the air quality in San Cristóbal de las Casas in September?
- San Cristóbal de las Casas has a mean US Air Quality Index of about 28 in September.