September · Mexico
Best time to visit Cozumel in September Weather, crowds & prices
Weather in Cozumel in September
Average temperature 29°C, 137 mm of rain, about 25 days with 6+ hours of sunshine and 84% humidity — based on the five most recent complete years of ERA5 data (2021–2025).
September score
7.8/10
Ranked #7 of 12 months
- Avg temp
- 29°C
- Rainfall
- 137 mm
- Humidity
- 84%
- Days with 6h+ sun
- 25
- Crowd Density
- Quiet / Uncrowded
- Average Expenses
- $$ · Moderate Cost ($$)
September in Cozumel scores 7.8/10 for beach and coastal travel - ranked #7 of 12. Expect around 29°C, 137 mm of rain, and roughly 25 days with 6+ hours of sunshine this month.
Cozumel's reefs, beach clubs and quiet east side make it the Caribbean's classic dive island.
September in Cozumel: strong conditions, 7th of 12
Days in September average 29°C (84°F) and humidity near 84% — front-load outdoor plans before the heat builds and treat the middle of the day as indoor time.
137 mm of rain makes this a wet month here, though with about 25 days with 6+ hours of sunshine there is still bright weather between the fronts.
That is 7.8/10 on the same scale — 7th of 12 months, versus 9.6/10 for the best month here.
Pack the lightest breathable clothing you own, a hat, and more water than feels necessary, a proper rain shell rather than an umbrella.
Budget for mid-season pricing, and crowds are light for this destination.
If your dates are flexible, April is materially better in Cozumel — 1.8 points higher on the same scale.
Frequently asked
- What is the weather like in Cozumel in September?
- In September, Cozumel averages 29°C, 137 mm of rain, and about 25 days with 6+ hours of sunshine. Its climate-comfort score is 7.8/10.
- Is September a good time to visit Cozumel?
- September earns a 7.8/10 climate-comfort score. Use the year-round chart to weigh the weather against your budget and crowd preferences.
- How much does it rain in Cozumel in September?
- Expect about 137 mm of rain in September. Average humidity is 84% and there are about 25 days with 6+ hours of sunshine.
Curated in Cozumel
Tickets & experiences
Things to do in Cozumel
Cozumel, Mexico. Live activities and tours from GetYourGuide, matched to this destination.