If you plan to visit Cozumel in September, the weather is typically alright, with an average high temperature of +84°F during the day and approximately 1 sunny days. Expect some rainy, though, as there are typically 26 rainy days in the month and around 188 mm of precipitation. The weather is changeable so you may have to pack for every eventuality. Search flightsin one click on Avionero.
Good to know:
September is usually the hottest month of the year in Cozumel;
September is usually the wettest month of the year in Cozumel;
Average weather
☀️
+84°F
Avg. max. temperature
+68°F
Min.
+95°F
Max.
188 mm
Total precipitation
83%
Avg. humidity
3 m/s
Avg. wind
1 ☀️
Sunny Days
2 ⛅️
Cloudy
26 🌦
Rainy
Our opinion: Cozumel has OK weather in September.
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Average temperature in Cozumel in September
Here are the expected maximum, average and minimum temperatures in Cozumel for September based on the historical data.
Last Year
Historical Data
Going from a maximum of +91°F during the day to a minimum of +77°F during the night, the temperature in September averages around +90°F.
The average maximum temperature goes up 0% by the end of the month, compared with the beginning of the month, from +91°F to +91°F.
Is Cozumel warm or cold in September?
Cozumel is typically warm in September.
Maximum temperatures go up compared to the previous month from +84°F to +84°F. The minimum temperature also goes up from +81°F to +81°F.
It’s generally warm, but pack a long-sleeve shirt for evenings.
September is the hottest month in Cozumel, here is the comparison with other months:
Climate in Cozumel in September
Cozumel weather looks like this, on average, in September and the surrounding months.
August
September
October
Avg. temperature
+84°F
+84°F
+82°F
Min. temperature
+68°F
+68°F
+72°F
Max. temperature
+93°F
+95°F
+91°F
Rainfall
122 mm
188 mm
206 mm
Wind
3 m/s
3 m/s
4 m/s
Humidity
82%
83%
82%
Air pressure
1013 HPa
1011 HPa
1012 HPa
Sunny days
2
1
2
Cloudy days
4
2
3
Rainy days
24
26
25
Snowy days
0
0
0
September weather is still as ok as in August.The temperature levels stay the same in the area of +84°F for average maximum temperature during the day.Prepare for more rain. Average rainfall goes from 122 mm to 188 mm.Humidity rises from 82% to 83%.The average wind speed doesn’t change much during September, staying around 3 m/s.The days becoming less sunny, going from 2 sunny days in August to 1 in September.
October brings much the same weather, it remains ok.
Wind speed in Cozumel in September based on historical data.
Last Year
Historical Data
The average wind speed is 3 m/s getting up to 4 m/s which is a light breeze; barely moving the tree leaves.
The average wind speed in Cozumel is gradually increasing during September, going from 3 m/s to 3 m/s over the course of the month.
Rain
Amount of rainfall in mm during September in Cozumel based on historical data.
Last Year
Historical Data
Typically, there is a 60% chance of rain on an average day in September, with total rainfall of approximately 121 mm. The maximum amount of rainfall per day is around 19 mm, which is considered light rain.September is a pretty wet month with over 18 rainy days, so don’t forget to pack an umbrella, raincoat, and a pair of wellies.
September is one of the rainiest months in Cozumel, here is a comparison with other months, total mm:
Cozumel wettest month is October, where a typical day has a 81% chance of precipitation and 206 mm of rainfall per day. April, on the other hand, is the driest month with a mere 43% chance of precipitation and 33 mm of rainfall per day.
How was the weather last September in Cozumel?
This is the weather in Cozumel in September 2025:
1 September
☁️
+91°F
2 September
☁️
+91°F
3 September
☁️
+90°F
4 September
🌧️
+89°F
5 September
☁️
+88°F
6 September
☁️
+90°F
7 September
☀️
+91°F
8 September
☁️
+91°F
9 September
🌧️
+90°F
10 September
🌧️
+89°F
11 September
☁️
+90°F
12 September
☁️
+92°F
13 September
☁️
+92°F
14 September
☁️
+92°F
15 September
☁️
+92°F
16 September
☀️
+92°F
17 September
☀️
+89°F
18 September
🌧️
+89°F
19 September
☀️
+91°F
20 September
☀️
+91°F
21 September
🌧️
+90°F
22 September
☁️
+91°F
23 September
☁️
+90°F
24 September
☁️
+90°F
25 September
☁️
+87°F
26 September
🌧️
+87°F
27 September
🌧️
+89°F
28 September
🌧️
+85°F
29 September
🌧️
+87°F
30 September
🌧️
+91°F
In September 2025 Cozumel had 5 sunny days, 15 cloudy days, and 10 rainy days. The average maximum temperature was +90°F, with an absolute maximum of +91°F and a minimum of +84°F. The average humidity was 86%, with a maximum of 100% and a minimum of 71%. The average wind speed was 3 m/s, with a maximum of 7 m/s and a minimum of 0 m/s.
Are you planning a trip in September?
Climate Change Over the Years
This is how Cozumel climate has changed over the last 43 years.
The climate in Cozumel in September has not changed that much over the last 43 years.
The average temperature was the lowest in 1984 (+80°F) and the highest in 2023 (+87°F). The driest year was 2004 with only 723 mm of rainfall, and the wettest year was 1983 with 2095 mm.
FAQ
Frequently asked questions about the weather in Cozumel in September:
Is September a good time to visit Cozumel?
It’s always a good time to visit Cozumel, but the weather is changeable in September, so plan a mix of indoor and outdoor activities and exploring, and pack for every eventuality.
Can you sunbathe in Cozumel in September?
September is warm in Cozumel. You may enjoy some beach or pool time in the day, but pack something a tad warmer for the evening.
Is Cozumel rainy in September?
Cozumel is often rainy in September. You may get a bit damp when outside, so pack an umbrella, and maybe even a raincoat.
Is it sunny in Cozumel in September?
Usually, it’s not very sunny in Cozumel in September, often it’s pretty cloudy. Pack for any eventuality; layering can help reduce the number of bulky items needed.
For this page, we’ve looked at the typical weather in Cozumel, based on historical hourly weather data from January 1, 1979, to December 31, 2023.
For past dates, we show actual recorded data at the location at that time. Forecasts are based on recorded weather during that day of the year, averaged over the total years for which we have records (unless stated otherwise). The daily temperature is the highest recorded temperature in the shadow during that day.
