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September Weather in Morristown, United States

Last updated: June 24, 2025

In September, the average temperature in Morristown, United States hovers around 21°C (70°F). Temperatures can range from a chilly 5°C (42°F) to a sweltering 33°C (92°F). Expect 88 mm (3.5 in) of precipitation over about 7 days, maintaining a comfortable average humidity of 69%.

September Temperature in Morristown

In September in Morristown, the average temperature is 21°C (70°F). Maximum temperatures can reach 33°C (92°F), while the minimum can drop as low as 5°C (42°F). This variability makes Morristown an ideal destination for travelers looking for a diverse climate experience.

September Weather in Morristown: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Morristown, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Morristown, September typically has an average temperature of 21°C (70°F), with highs reaching up to 33°C (92°F) and lows dropping to around 5°C (42°F).
JanFebMarAprMayJunJulAugSepOctNovDec303443526473767470584236
Data source: Temperature data for Morristown generated using information from the Copernicus Climate Change Service.
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The average of daily temperatures (24 hours) calculated across all days in the month.

September Precipitation in Morristown

In Morristown in September, the precipitation amount is 88 mm (3.5 in) over a span of 7 days.

September Precipitation Trends in Morristown

The chart displays monthly precipitation patterns in Morristown, with values for each month alongside September’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how September’s conditions compare to those of other months. In Morristown, September typically receives around 88 mm (3.5 inches) of precipitation spread over approximately 7 days.
JanFebMarAprMayJunJulAugSepOctNovDec8310013410213610511292881029887
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Morristown

In Morristown in September humidity is 69%. With an average temperature of 21°C (70°F), this humidity feels like a warm embrace, making outdoor activities enjoyable but requiring occasional breaks for hydration and shade during your travels.

September Average Humidity in Morristown

This chart illustrates the average monthly humidity levels in Morristown, with September’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In September, average humidity in Morristown is approximately 69%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec87%85%86%84%79%82%79%70%69%76%88%87%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Morristown

In Morristown in September, the maximum UV index is 8, which corresponds to a very high Exposure Category. This means that the time to burn is only 15 minutes. For more detailed information, you can refer to the Hourly UV Index in Morristown.

Maximum UV Index Levels in Morristown for September

The chart shows the monthly maximum UV Index (UVI) for Morristown in September, representing the highest UV radiation level. The UVI measures the intensity of ultraviolet radiation from the sun, indicating the potential risk of sunburn and UV-related health issues. In September, the maximum UV index in Morristown typically reaches 8, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec357910111098643
Data source: Morristown September UVI data generated using information from the Copernicus Climate Change Service.

UV Risk Categories

  •  Extreme (11+): Avoid the sun, stay in shade.
  •  Very High (8-10): Limit sun exposure.
  •  High (6-7): Use SPF 30+ and protective clothing.
  •  Moderate (3-5): Midday shade recommended.
  •  Low (0-2): No protection needed.

How September Weather in Morristown Compares to Other Months

Weather in Morristown varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Morristown, focusing on differences in temperature, rainfall, humidity, and UV levels.

This table compares monthly weather conditions in Morristown, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-1°C (30°F)83 mm (3.3 inches)87%moderate
February Weather1°C (34°F)100 mm (3.9 inches)85%moderate
March Weather6°C (43°F)134 mm (5.3 inches)86%high
April Weather11°C (53°F)102 mm (4.0 inches)84%very high
May Weather18°C (65°F)136 mm (5.4 inches)79%very high
June Weather23°C (73°F)105 mm (4.1 inches)82%extreme
July Weather25°C (77°F)112 mm (4.4 inches)79%very high
August Weather23°C (74°F)92 mm (3.6 inches)70%very high
September Weather21°C (70°F)88 mm (3.5 inches)69%very high
October Weather14°C (58°F)102 mm (4.0 inches)76%high
November Weather5°C (42°F)98 mm (3.9 inches)88%moderate
December Weather2°C (36°F)86 mm (3.4 inches)87%moderate

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