Mexico City weather in September
September in Mexico City: nice, soaked, with very humid — an excellent time to visit.
#11 of 12 months in Mexico City · #226 of 604 destinations to visit in September · comfort 84/100 (tier A)
Updated June 2026 · climate normals from ERA5 reanalysis
Mexico City climate normals — September
| Daytime high | 21°C / 70°F | 😎 nice |
|---|---|---|
| Nighttime low | 12°C / 54°F | |
| Feels like (high) | 22°C / 72°F | |
| Rainfall | 160 mm / 6.3 in | ⛈ soaked |
| Rainy days | 19 days | |
| Humidity | 76% | 💦 very humid |
| Dew point | 12°C / 53°F | |
| Sunshine | 9.5 h/day | |
| Daylight | 12.2 h | |
| Wind | 13 km/h / 8 mph | |
| Air quality (US AQI) | 65 | 🙂 moderate |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
Where is Mexico City?
Loading map…
Mexico City in September — FAQ
- Is September a good time to visit Mexico City?
- September in Mexico City: nice, soaked, with very humid — an excellent time to visit. It ranks #11 of 12 months for Mexico City on SeasonMap's comfort score (84/100).
- What is the weather like in Mexico City in September?
- In September, Mexico City averages a daily high of 21.2°C and a low of 12.3°C, with about 160 mm of rain over roughly 18.6 rainy days.
- What is the air quality in Mexico City in September?
- Mexico City has a mean US Air Quality Index of about 65 in September.