Click on a day for an hourly weather forecast
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.
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | 16° / 8° | 2 | 29 | 0 | 28 mm | Good | Monterrey in January |
| February | 20° / 11° | 2 | 26 | 0 | 34 mm | Good | Monterrey in February |
| March | 24° / 15° | 5 | 26 | 0 | 77 mm | Perfect | Monterrey in March |
| April | 30° / 19° | 6 | 24 | 0 | 92 mm | Good | Monterrey in April |
| May | 33° / 22° | 11 | 20 | 0 | 221 mm | Ok | Monterrey in May |
| June | 33° / 23° | 8 | 22 | 0 | 183 mm | Ok | Monterrey in June |
| July | 33° / 23° | 7 | 24 | 0 | 194 mm | Ok | Monterrey in July |
| August | 34° / 24° | 7 | 24 | 0 | 148 mm | Bad | Monterrey in August |
| September | 30° / 22° | 10 | 20 | 0 | 251 mm | Ok | Monterrey in September |
| October | 25° / 17° | 4 | 27 | 0 | 87 mm | Perfect | Monterrey in October |
| November | 19° / 11° | 2 | 28 | 0 | 54 mm | Good | Monterrey in November |
| December | 17° / 9° | 1 | 30 | 0 | 35 mm | Good | Monterrey in December |