McKinney Weather in September

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

The climate in McKinney during September can be summarized as hot and damp.

September is in the fall / autumn in McKinney and is typically the 4th warmest month of the year. Daytime maximum temperatures average around 30°C (87°F), whilst at night 19°C (66°F) is normal.

McKinney weather averages (imperial / metric)
Daytime temperature 30.3°C 86.5°F
Nightly temperature 18.7°C 65.7°F
Average temperature 24.5°C 76.1°F
Daily sunshine 8.8 hrs
Avg rainfall 109 mm 4.3 ins
Rainy days 7 days
Sea temperature 24.2°C 75.6°F
Humidity 68%
Windspeed 15.1kph 9 mph

On average September is the 2nd wettest month of the year in McKinney with around 109mm 4.3 inches of rain making it a damp time to visit. This rainfall is typically spread over 7 days, although this may vary considerably.

On the flip side this corresponds to an average of 8.8 hours of sunshine per day.

September temperatures in McKinney

McKinney average temperature in September

September rainfall

McKinney average rain in September

September hourly sunshine

McKinney 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 McKinney 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

McKinney weather stats

McKinney weather statistics
Hottest month: July 34.5°C 94.1°F
Driest month: January 50mm 2ins
Sunniest month: July 11.4hrs
Coldest month: January 11.2°C 52.2°F
Wettest month: May 136mm 5.4ins
Map showing location of McKinney (33.19762, -96.61527) McKinney map pin © Google

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