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September Weather in Trenton, United States

Last updated: June 24, 2025

In September, the average temperature in Trenton, United States is a pleasant 23°C (74°F). Expect temperatures to range from a cool 10°C (49°F) to a warm 35°C (95°F). With an average precipitation of 121 mm (4.8 in) spread over 10 days, it’s wise to prepare for some wet weather. Additionally, the air carries an average humidity of 64%, creating a uniquely refreshing atmosphere.

September Temperature in Trenton

In September in Trenton, the average temperature is a pleasant 23°C (74°F). The maximum can reach a scorching 35°C (95°F), while the minimum can drop to a cool 10°C (49°F). This makes Trenton an ideal destination for travelers seeking warm weather with the option to enjoy cooler evenings.

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

The chart illustrates September temperature patterns in Trenton, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Trenton, September typically has an average temperature of 23°C (74°F), with highs reaching up to 35°C (95°F) and lows dropping to around 10°C (49°F).
JanFebMarAprMayJunJulAugSepOctNovDec434854607075787773645046
Data source: Temperature data for Trenton 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 Trenton

In Trenton in September, the precipitation amount is 121 mm (4.8 in) spread over a period of 10 days.

September Precipitation Trends in Trenton

The chart displays monthly precipitation patterns in Trenton, 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 Trenton, September typically receives around 121 mm (4.8 inches) of precipitation spread over approximately 10 days.
JanFebMarAprMayJunJulAugSepOctNovDec10919118416210614412215012114279150
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Trenton

In Trenton in September, humidity is 64%. With an average temperature of 23°C (74°F), this humidity feels like a warm blanket wrapping around you, making outdoor exploration enjoyable yet slightly sticky, so it's best to stay hydrated and take breaks in the shade while traveling.

September Average Humidity in Trenton

This chart illustrates the average monthly humidity levels in Trenton, 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 Trenton is approximately 64%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec87%87%85%82%83%82%78%67%64%75%87%89%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Trenton

In Trenton 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 Trenton.

Maximum UV Index Levels in Trenton for September

The chart shows the monthly maximum UV Index (UVI) for Trenton 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 Trenton typically reaches 9, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec46810111111119764
Data source: Trenton 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 Trenton Compares to Other Months

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

This table compares monthly weather conditions in Trenton, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather6°C (43°F)109 mm (4.3 inches)87%moderate
February Weather9°C (48°F)191 mm (7.5 inches)87%high
March Weather12°C (54°F)184 mm (7.2 inches)85%very high
April Weather16°C (60°F)162 mm (6.4 inches)82%very high
May Weather21°C (70°F)106 mm (4.2 inches)83%extreme
June Weather24°C (75°F)144 mm (5.7 inches)82%extreme
July Weather26°C (79°F)122 mm (4.8 inches)78%extreme
August Weather25°C (77°F)150 mm (5.9 inches)67%extreme
September Weather23°C (74°F)121 mm (4.8 inches)64%very high
October Weather18°C (64°F)142 mm (5.6 inches)74%high
November Weather10°C (50°F)79 mm (3.1 inches)87%high
December Weather8°C (46°F)150 mm (5.9 inches)88%moderate

Compare Trenton's Climate with Cities Worldwide