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September Weather in Denville, United States

Last updated: June 24, 2025

In September, the average temperature in Denville, United States hovers around 19°C (67°F), providing a pleasant climate for outdoor activities. Temperatures can vary, with a minimum of 4°C (40°F) and a soaring maximum of 34°C (93°F). Expect some rain, as precipitation averages 111 mm (4.4 in) over 10 days, and enjoy the moderate humidity level at 68% that adds a touch of freshness to the air.

September Temperature in Denville

In September in Denville, the average temperature is 19°C (67°F). Maximum temperatures can reach 34°C (93°F), while minimums can drop to as low as 4°C (40°F). Travelers should prepare for a wide range of temperatures and pack accordingly.

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

The chart illustrates September temperature patterns in Denville, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Denville, September typically has an average temperature of 19°C (67°F), with highs reaching up to 34°C (93°F) and lows dropping to around 4°C (40°F).
JanFebMarAprMayJunJulAugSepOctNovDec313439506069757367574235
Data source: Temperature data for Denville 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 Denville

In Denville in September, the precipitation amount is 111 mm (4.4 in) over a span of 10 days.

September Precipitation Trends in Denville

The chart displays monthly precipitation patterns in Denville, 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 Denville, September typically receives around 111 mm (4.4 inches) of precipitation spread over approximately 10 days.
JanFebMarAprMayJunJulAugSepOctNovDec721019711713710214213611114390112
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Denville

In Denville in September, humidity is 68%. With an average temperature of 19°C (67°F), this humidity feels like a warm, enveloping blanket, making travel pleasant yet slightly muggy, which can be refreshing while exploring but may require occasional breaks to stay comfortable.

September Average Humidity in Denville

This chart illustrates the average monthly humidity levels in Denville, 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 Denville is approximately 68%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec84%82%81%78%70%69%62%65%68%74%82%80%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Denville

In Denville 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 Denville.

Maximum UV Index Levels in Denville for September

The chart shows the monthly maximum UV Index (UVI) for Denville 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 Denville typically reaches 8, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec356810101098642
Data source: Denville 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 Denville Compares to Other Months

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

This table compares monthly weather conditions in Denville, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-1°C (31°F)72 mm (2.8 inches)84%moderate
February Weather1°C (34°F)101 mm (4.0 inches)82%moderate
March Weather4°C (39°F)97 mm (3.8 inches)81%high
April Weather10°C (50°F)117 mm (4.6 inches)78%very high
May Weather16°C (60°F)137 mm (5.4 inches)69%very high
June Weather21°C (70°F)102 mm (4.0 inches)69%very high
July Weather24°C (76°F)142 mm (5.6 inches)62%very high
August Weather23°C (74°F)136 mm (5.4 inches)65%very high
September Weather19°C (67°F)111 mm (4.4 inches)68%very high
October Weather14°C (57°F)143 mm (5.6 inches)74%high
November Weather6°C (43°F)90 mm (3.5 inches)82%moderate
December Weather2°C (35°F)112 mm (4.4 inches)80%low

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