Cozumel weather in September
September in Cozumel: hot, rainy, with clean air — an excellent time to visit.
#6 of 12 months in Cozumel · #410 of 897 destinations to visit in September · comfort 84/100 (tier A)
Updated June 2026 · climate normals from ERA5 reanalysis
Traveller notes on Cozumel in September
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Cozumel climate normals — September
| Daytime high | 29°C / 85°F | 🥵 hot |
|---|---|---|
| Nighttime low | 27°C / 81°F | |
| Rainfall | 104 mm / 4.1 in | 🌧 rainy |
| Rainy days | 18 days | |
| Humidity | 79% | 💦 very humid |
| Dew point | 24°C / 76°F | |
| Sunshine | 10.8 h/day | |
| Daylight | 12.3 h | |
| Wind | 21 km/h / 13 mph | |
| Air quality (US AQI) | 33 | 🍃 good |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
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Cozumel in September — FAQ
- Is September a good time to visit Cozumel?
- September in Cozumel: hot, rainy, with clean air — an excellent time to visit. It ranks #6 of 12 months for Cozumel on SeasonMap's comfort score (84/100).
- What is the weather like in Cozumel in September?
- In September, Cozumel averages a daily high of 29.3°C and a low of 27.3°C, with about 103.9 mm of rain over roughly 17.8 rainy days.
- What is the air quality in Cozumel in September?
- Cozumel has a mean US Air Quality Index of about 33 in September.