The weather in Mcallen in September is very hot. The average temperatures are between 26°C and 34°C, drinking water regularly is advisable.
You can expect about 3 to 8 days of rain in Mcallen during the month of September. It’s a good idea to bring along your umbrella so that you don’t get caught in poor weather.
Our weather forecast can give you a great sense of what weather to expect in Mcallen in September 2025.
If you’re planning to visit Mcallen in the near future, we highly recommend that you review the 14 day weather forecast for Mcallen before you arrive.
Temperatures
34° / 26°
Rainy Days
7
Snowy Days
0
Dry Days
23
Rainfall
137
mm
Sun Hours
11.2
Hrs
