The weather in Monterrey in September is hot. The average temperatures are between 22°C and 30°C.
You can expect rain for roughly half of the month of September in Monterrey. 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 Monterrey in September 2025.
If you’re planning to visit Monterrey in the near future, we highly recommend that you review the 14 day weather forecast for Monterrey before you arrive.
Temperatures
30° / 22°
Rainy Days
10
Snowy Days
0
Dry Days
20
Rainfall
251
mm
Sun Hours
11.3
Hrs
