San Cristóbal de Las Casas Weather in September

With daytime temperatures of 25°C (77°F) and nighttime lows of 15°C (59°F), September in San Cristóbal de Las Casas brings high temperatures during the day. Do keep in mind that September is part of the rainy season, with frequent and often heavy rainfall.

Rainfall in San Cristóbal de Las Casas in September

San Cristóbal de Las Casas is in the rainy season in September, with rain on around 20 days and an average of 417 mm (16 in). Rain during the rainy season here tends to be intense rather than just persistent drizzle. Expect significant downpours.

Temperature in San Cristóbal de Las Casas in September

In September, San Cristóbal de Las Casas sees high temperatures, with highs of 25°C (77°F). Nights drop to around 15°C (59°F). Conditions stay fairly consistent through the month, making it easier to plan what to wear. Nights drop to around 15°C (59°F), which is noticeably cooler than the daytime. A light jacket for the evening is a sensible addition, and the cool nights tend to make sleeping comfortable.

Sunshine in San Cristóbal de Las Casas in September

The area enjoys a balanced 118 hours of sunlight, ensuring it's neither too rainy nor too sunny.

September in San Cristóbal de Las Casas has its charm, but if you're looking for destinations with pleasant temperatures and sunny skies, our weather planner can help you explore other options in the world.

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For a detailed overview over the year and the best time to visit Mexico, check out our San Cristóbal de Las Casas's climate page.

San Cristóbal de Las Casas Temperature in September

Min Temperature 15°C (59°F)  

Max Temperature 25°C (77°F)  

Chance of Rain 68%  

Precipitation 417 mm (16 in)  

Rainy days 20 days  

Humidity 80%  

Sunshine 118 hours  

Percentage Sunshine  

Daily Historical Temperatures

49-year average (1976-2025)

Based on our historical records, temperatures in San Cristóbal de Las Casas typically stay consistent throughout September, with daily highs averaging around 25°C (77°F). Nights are cool, with lows around 14°C (57°F).

Average temperatures in September

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Daily Historical Precipitation

49-year average (1976-2025)

Average daily rainfall for each day of the month based on long-term records.

Average precipitation in September

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Historical weather for San Cristóbal de Las Casas in September

Browse day-by-day weather records for San Cristóbal de Las Casas spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.

Historical weather Temperatures Precipitation

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San Cristóbal de Las Casas historical weather extremes in September

The extremes listed below come from historical weather data collected in San Cristóbal de Las Casas from 1986 through 2025.

• On September 15, 2009, temperatures climbed to 35°C (95°F), marking the warmest September day on record.
• San Cristóbal de Las Casas experienced its chilliest September day on September 9, 1998, reaching only 16°C (61°F).
• The lowest overnight temperature recorded in September was 7°C (45°F) (September 1, 1987).
• The wettest September day on record brought 232 mm (9.1 in) of precipitation to San Cristóbal de Las Casas (September 4, 1997).

What to Wear in San Cristóbal de Las Casas in September

Pleasant temperatures in September mean you can pack light but flexibel pieces. Think cotton t-shirts, comfortable walking shorts, and one warmer layer for evenings. A light sweater or denim jacket works well. Heavy rain is guaranteed, please bring a good poncho and waterproof everything! It won't hurt to bring your sunglasses along, as you'll see some sunny periods.

What To Do in San Cristóbal de Las Casas in September

We rated the following activities from 1 (least suitable) to 10 (best) to do.

Swimming

7/10

Camping

6/10

Select a Month

Check the conditions for any month of the year.

• January
• February
• March
• April

• May
• June
• July
• August

• September
• October
• November
• December

For a detailed overview over the year and the best time to visit Mexico, check out our San Cristóbal de Las Casas's climate page.

More climate data for San Cristóbal de Las Casas

Temperature Rainfall Sunshine Humidity

See the full San Cristóbal de Las Casas climate overview or explore weather in Mexico.