Cancún weather in September
September in Cancún: sweltering, rainy, with clean air — an excellent time to visit.
#8 of 12 months in Cancún · #259 of 604 destinations to visit in September · comfort 82/100 (tier A)
Updated June 2026 · climate normals from ERA5 reanalysis
Cancún climate normals — September
| Daytime high | 30°C / 86°F | 🔥 sweltering |
|---|---|---|
| Nighttime low | 27°C / 80°F | |
| Feels like (high) | 36°C / 97°F | |
| Rainfall | 137 mm / 5.4 in | 🌧 rainy |
| Rainy days | 21 days | |
| Humidity | 81% | 💦 very humid |
| Dew point | 24°C / 76°F | |
| Sunshine | 10.7 h/day | |
| Daylight | 12.3 h | |
| Wind | 14 km/h / 9 mph | |
| Air quality (US AQI) | 35 | 🍃 good |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
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Cancún in September — FAQ
- Is September a good time to visit Cancún?
- September in Cancún: sweltering, rainy, with clean air — an excellent time to visit. It ranks #8 of 12 months for Cancún on SeasonMap's comfort score (82/100).
- What is the weather like in Cancún in September?
- In September, Cancún averages a daily high of 29.9°C and a low of 26.5°C, with about 136.8 mm of rain over roughly 21 rainy days.
- What is the air quality in Cancún in September?
- Cancún has a mean US Air Quality Index of about 35 in September.