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September Weather in Trenton, United States

Last updated: June 24, 2025

In Trenton, United States, the average temperature in September hovers around 24°C (76°F), with a comfortable range between a cool 10°C (51°F) and a warm 35°C (96°F). Expect a total precipitation of 199 mm (7.8 in) over approximately 12 days, leading to an average humidity level of 80%—perfect for those who thrive in a tropical climate!

September Temperature in Trenton

In September in Trenton, the average temperature is 24°C (76°F), with maximums reaching 35°C (96°F) and minimums dropping as low as 10°C (51°F). Therefore, it's advisable to pack layers for your travels, ensuring comfort in both warmer afternoons and 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 24°C (76°F), with highs reaching up to 35°C (96°F) and lows dropping to around 10°C (51°F).
JanFebMarAprMayJunJulAugSepOctNovDec465254637177807975675450
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 199 mm (7.8 in) over the course of 12 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 199 mm (7.8 inches) of precipitation spread over approximately 12 days.
JanFebMarAprMayJunJulAugSepOctNovDec75986811412717516420419971103120
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 80%. With an average temperature of 24°C (76°F), this humidity feels like a warm, sticky embrace that can make exploring outdoors quite draining, so it's essential 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 80%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec84%81%80%80%81%82%83%83%80%80%83%84%
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.
JanFebMarAprMayJunJulAugSepOctNovDec46810111111109854
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 Weather8°C (46°F)75 mm (3.0 inches)84%moderate
February Weather11°C (52°F)98 mm (3.9 inches)81%high
March Weather12°C (55°F)67 mm (2.7 inches)80%very high
April Weather17°C (63°F)114 mm (4.5 inches)80%very high
May Weather22°C (71°F)127 mm (5.0 inches)81%extreme
June Weather25°C (77°F)175 mm (6.9 inches)82%extreme
July Weather27°C (80°F)164 mm (6.5 inches)83%extreme
August Weather26°C (79°F)204 mm (8.0 inches)82%very high
September Weather24°C (76°F)199 mm (7.8 inches)80%very high
October Weather20°C (68°F)71 mm (2.8 inches)79%very high
November Weather12°C (55°F)103 mm (4.0 inches)83%moderate
December Weather10°C (50°F)120 mm (4.7 inches)84%moderate

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