Mertzon Weather in September

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

The climate in Mertzon during September can be summarized as hot and a little damp.

September is in the fall / autumn in Mertzon and is typically the 4th warmest month of the year. Daytime maximum temperatures average around a comfortable 30°C (86°F), whilst at night 18°C (64°F) is normal.

Mertzon weather averages (imperial / metric)
Daytime temperature 30.2°C 86.3°F
Nightly temperature 17.7°C 63.8°F
Average temperature 23.9°C 75°F
Daily sunshine 8.6 hrs
Avg rainfall 84 mm 3.3 ins
Rainy days 7 days
Sea temperature 27°C 80.6°F
Humidity 64%
Windspeed 15.8kph 10 mph

On average September is the wettest month of the year in Mertzon with around 84mm 3.3 inches of rain making it a a little 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 8.6 hours of sunshine per day.

September temperatures in Mertzon

Mertzon average temperature in September

September rainfall

Mertzon average rain in September

September hourly sunshine

Mertzon 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 Mertzon 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

Mertzon weather stats

Mertzon weather statistics
Hottest month: July 34.8°C 94.6°F
Driest month: January 20mm 0.8ins
Sunniest month: July 10.9hrs
Coldest month: January 13.6°C 56.5°F
Wettest month: September 84mm 3.3ins
Map showing location of Mertzon (31.26183, -100.81733) Mertzon map pin © Google

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