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September Weather in Morristown, United States

Last updated: June 24, 2025

In Morristown, United States, the average temperature in September is a pleasant 23°C (73°F). Expect a range between a cool 7°C (46°F) and a warm 35°C (96°F). During this month, you can anticipate approximately 83 mm (3.3 in) of precipitation spread over 8 days, contributing to an average humidity of 67%.

September Temperature in Morristown

In September in Morristown, the average temperature is a pleasant 23°C (73°F). Maximum temperatures can reach up to 35°C (96°F), while minimum temperatures can drop as low as 7°C (46°F). This variation makes it essential for travelers to pack versatile clothing to enjoy both warm days and cooler evenings.

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 23°C (73°F), with highs reaching up to 35°C (96°F) and lows dropping to around 7°C (46°F).
JanFebMarAprMayJunJulAugSepOctNovDec404551586874787673624843
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 reaches 83 mm (3.3 in) over the course of 8 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 83 mm (3.3 inches) of precipitation spread over approximately 8 days.
JanFebMarAprMayJunJulAugSepOctNovDec901541371301091061011048312376122
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 67%. With an average temperature of 23°C (73°F), this humidity feels like a warm, enveloping blanket that makes the air feel thick and slightly sticky, which can be challenging for travelers who prefer cooler, drier conditions.

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 67%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec88%88%87%84%84%83%79%66%67%76%89%88%
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 9, which corresponds to a very high Exposure Category. The time to burn is just 15 minutes, so it's essential to take precautions. For detailed information, you can check 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 9, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec36810111111109753
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 Weather4°C (40°F)89 mm (3.5 inches)88%moderate
February Weather7°C (45°F)154 mm (6.1 inches)88%high
March Weather10°C (51°F)137 mm (5.4 inches)87%very high
April Weather14°C (58°F)130 mm (5.1 inches)84%very high
May Weather20°C (68°F)109 mm (4.3 inches)84%extreme
June Weather23°C (74°F)106 mm (4.2 inches)83%extreme
July Weather26°C (78°F)101 mm (4.0 inches)79%extreme
August Weather25°C (77°F)104 mm (4.1 inches)66%very high
September Weather23°C (73°F)83 mm (3.3 inches)67%very high
October Weather17°C (62°F)123 mm (4.8 inches)76%high
November Weather9°C (48°F)76 mm (3.0 inches)89%moderate
December Weather6°C (44°F)122 mm (4.8 inches)88%moderate

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