McAllen Weather in September

What's the weather like in McAllen (Texas) in September 2025?

The climate in McAllen during September can be summarized as very hot, humid and damp.

September is in the fall / autumn in McAllen and is typically the 4th warmest month of the year. Daytime maximum temperatures average around a steamy 34°C (93°F), whilst at night 23°C (74°F) is normal.

McAllen weather averages (imperial / metric)
Daytime temperature 33.7°C 92.6°F
Nightly temperature 23.2°C 73.7°F
Average temperature 28.4°C 83.1°F
Daily sunshine 7.8 hrs
Avg rainfall 101 mm 4 ins
Rainy days 6 days
Sea temperature 28.9°C 84°F
Humidity 73%
Windspeed 14.4kph 9 mph

On average September is the wettest month of the year in McAllen with around 101mm 4 inches of rain making it a damp time to visit. This rainfall is typically spread over 6 days, although this may vary considerably.

On the flip side this corresponds to an average of 7.8 hours of sunshine per day.

September temperatures in McAllen

McAllen average temperature in September

September rainfall

McAllen average rain in September

September hourly sunshine

McAllen average rain in September

The data used in these monthly averages covers a period of over 100 years right up until last year. As such they are a valid prediction of what to expect for the weather in McAllen in September 2025.

Other monthly averages

Best places to visit in September

UV index Best time to go?

Beta

Current (hourly) weather 15 day forecast

McAllen weather stats

McAllen weather statistics
Hottest month: August 35.6°C 96.1°F
Driest month: March 12mm 0.5ins
Sunniest month: July 10.1hrs
Coldest month: January 20.3°C 68.5°F
Wettest month: September 101mm 4ins
Map showing location of McAllen (26.20341, -98.23001) McAllen map pin © Google

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