The temperatures in Isla Mujeres during September are extremely high, between 27°C and hot as 31°C, drinking water regularly is advisable.
You can expect rain for roughly half of the month of September in Isla Mujeres. We’re expecting roughly 8 to 15 days of rain, so your rubber boots and umbrella are going to see plenty of use this month if you’re keen on staying dry.
Our weather forecast can give you a great sense of what weather to expect in Isla Mujeres in September 2025.
If you’re planning to visit Isla Mujeres in the near future, we highly recommend that you review the 14 day weather forecast for Isla Mujeres before you arrive.
Temperatures
31° / 27°
Rainy Days
12
Snowy Days
0
Dry Days
18
Rainfall
209
mm
Sun Hours
11.3
Hrs
