Climate averages 1991–2020
Cozumel weather
in September.
A hot, wet month: the 3rd warmest and the 11th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
September is a hot month in Cozumel: daytime highs average 28.8°C and nights cool to about 26.6°C. By daytime temperature it is the 3rd warmest of the 12 months.
Expect about 179 mm of rain on roughly 21 days, which makes September a wet month (the 11th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 12 h 16 min on an average September day.
The nearest other city in this atlas is Playa del Carmen (20 km away). In September its highs average 29.6°C, 0.8°C warmer than Cozumel, with 166 mm of rain.
Among the 153 cities listed in Mexico, Cozumel ranks joint 62nd of 153 for the warmest September highs and 101st of 153 for the driest September (rainfall, lowest first). The mean September high of those 153 cities is 26.5°C; Cozumel is 2.2°C warmer than that mean.
From September to October, average highs fall by 0.9°C to 27.9°C, and monthly rainfall rises from 179 mm to 215 mm.
The annual picture
September in context
Monthly rainfall
Average total · mmAverages from hourly ERA5 reanalysis data. Actual weather varies from year to year. How these numbers are calculated
Every month, side by side
Cozumel climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 25.3°C23.4°C | 23.4°C | 64 | 11.6 | 11.011 h |
| February | 25.7°C23.8°C | 23.8°C | 28 | 6.9 | 11.511 h |
| March | 26.3°C24.3°C | 24.3°C | 26 | 5.7 | 12.012 h |
| April | 27.3°C25.3°C | 25.3°C | 29 | 5.7 | 12.613 h |
| May | 28.1°C26.1°C | 26.1°C | 84 | 11.1 | 13.113 h |
| June | 28.5°C26.6°C | 26.6°C | 168 | 17.4 | 13.413 h |
| July | 28.9°C27.0°C | 27.0°C | 82 | 14.1 | 13.213 h |
| August | 29.1°C27.0°C | 27.0°C | 107 | 16.2 | 12.813 h |
| September, selected | 28.8°C26.6°C | 26.6°C | 179 | 21.1 | 12.312 h |
| October | 27.9°C25.9°C | 25.9°C | 215 | 19.7 | 11.712 h |
| November | 26.7°C24.9°C | 24.9°C | 103 | 12.9 | 11.211 h |
| December | 25.9°C24.1°C | 24.1°C | 66 | 11.7 | 10.911 h |
Rainfall is the average of the 30 separate monthly totals. A rain day is a local calendar day with at least 1 mm of precipitation. Daylight is the calculated sunrise-to-sunset length, not measured sunshine.
Compare places
September in nearby cities
- Playa del Carmen in SeptemberMexico · 20 kmHigh 29.6°C · Low 25.6°C · 166 mm rain
- Cancún in SeptemberMexico · 76 kmHigh 29.2°C · Low 25.9°C · 162 mm rain
- Chetumal in SeptemberMexico · 262 kmHigh 30.6°C · Low 24.6°C · 186 mm rain
- Kanasín in SeptemberMexico · 276 kmHigh 33.1°C · Low 24.0°C · 134 mm rain
- Mérida in SeptemberMexico · 284 kmHigh 32.8°C · Low 24.1°C · 134 mm rain
- Campeche in SeptemberMexico · 380 kmHigh 31.8°C · Low 24.9°C · 174 mm rain
- Pinar del Río in SeptemberCuba · 398 kmHigh 30.6°C · Low 24.0°C · 182 mm rain
- Belmopan in SeptemberBelize · 409 kmHigh 30.5°C · Low 23.5°C · 150 mm rain
Read the numbers correctly
Climate, not a promise.
These patterns help compare months. They cannot tell you the weather on a specific day of your trip.
Sources, method and limitsHow these numbers are made (what the highs, lows and rain days mean, the sources and the model cell used for Cozumel) is explained once on the Cozumel year overview and on the Sources, method and limits page.