Chambersburg Weather in September

What's the weather like in Chambersburg (Pennsylvania) in September 2025?

The climate in Chambersburg during September can be summarized as mild and a little damp.

September is in the fall / autumn in Chambersburg and is typically the 4th warmest month of the year. Daytime maximum temperatures average around 24°C (76°F), whilst at night 12°C (53°F) is normal.

Chambersburg weather averages (imperial / metric)
Daytime temperature 24.2°C 75.5°F
Nightly temperature 11.5°C 52.6°F
Average temperature 17.8°C 64°F
Daily sunshine 7.7 hrs
Avg rainfall 86 mm 3.4 ins
Rainy days 9 days
Sea temperature 21.4°C 70.6°F
Humidity 75%
Windspeed 11.5kph 7 mph

On average September is the 5th driest month of the year in Chambersburg with around 86mm 3.4 inches of rain making it a a little damp time to visit. This rainfall is typically spread over 9 days, although this may vary considerably.

On the flip side this corresponds to an average of 7.7 hours of sunshine per day.

September temperatures in Chambersburg

Chambersburg average temperature in September

September rainfall

Chambersburg average rain in September

September hourly sunshine

Chambersburg 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 Chambersburg 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

Chambersburg weather stats

Chambersburg weather statistics
Hottest month: July 28.7°C 83.7°F
Driest month: February 70mm 2.8ins
Sunniest month: July 9.9hrs
Coldest month: January 1.7°C 35.1°F
Wettest month: June 101mm 4ins
Map showing location of Chambersburg (39.93759, -77.6611) Chambersburg map pin © Google

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