Morristown Weather in September

What's the weather like in Morristown (New Jersey) in September 2025?

The climate in Morristown during September can be summarized as warm and damp.

September is in the fall / autumn in Morristown and is typically the 4th warmest month of the year. Daytime maximum temperatures average around a comfortable 25°C (76°F), whilst at night 12°C (54°F) is normal.

Morristown weather averages (imperial / metric)
Daytime temperature 24.5°C 76°F
Nightly temperature 12.2°C 53.9°F
Average temperature 18.3°C 64.9°F
Daily sunshine 7.7 hrs
Avg rainfall 108 mm 4.3 ins
Rainy days 8 days
Sea temperature 21°C 69.8°F
Humidity 70%
Windspeed 15.5kph 10 mph

On average September is the 5th wettest month of the year in Morristown with around 108mm 4.3 inches of rain making it a damp time to visit. This rainfall is typically spread over 8 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 Morristown

Morristown average temperature in September

September rainfall

Morristown average rain in September

September hourly sunshine

Morristown 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 Morristown 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

Morristown weather stats

Morristown weather statistics
Hottest month: July 29°C 84.2°F
Driest month: February 80mm 3.1ins
Sunniest month: August 9hrs
Coldest month: January 1.9°C 35.4°F
Wettest month: July 123mm 4.8ins
Map showing location of Morristown (40.79677, -74.48154) Morristown map pin © Google

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