Monterrey weather in September
September in Monterrey: hot, rainy, with clean air — a great time to visit.
#11 of 12 months in Monterrey · #358 of 604 destinations to visit in September · comfort 77/100 (tier B)
Updated June 2026 · climate normals from ERA5 reanalysis
Monterrey climate normals — September
| Daytime high | 31°C / 87°F | 🥵 hot |
|---|---|---|
| Nighttime low | 22°C / 71°F | |
| Feels like (high) | 33°C / 91°F | |
| Rainfall | 84 mm / 3.3 in | 🌧 rainy |
| Rainy days | 6 days | |
| Humidity | 61% | 💧 humid |
| Dew point | 18°C / 64°F | |
| Sunshine | 10.6 h/day | |
| Daylight | 12.3 h | |
| Wind | 12 km/h / 8 mph | |
| Air quality (US AQI) | 47 | 🍃 good |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
Where is Monterrey?
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Monterrey in September — FAQ
- Is September a good time to visit Monterrey?
- September in Monterrey: hot, rainy, with clean air — a great time to visit. It ranks #11 of 12 months for Monterrey on SeasonMap's comfort score (77/100).
- What is the weather like in Monterrey in September?
- In September, Monterrey averages a daily high of 30.7°C and a low of 21.8°C, with about 84.2 mm of rain over roughly 5.6 rainy days.
- What is the air quality in Monterrey in September?
- Monterrey has a mean US Air Quality Index of about 47 in September.