nomadseason

September Weather in Trenton, United States

Last updated: June 24, 2025

In Trenton, United States, the average temperature in September is a comfortable 17°C (62°F), with extremes ranging from a chilly 0°C (33°F) to a warm 34°C (93°F). During this month, you can expect precipitation of about 30 mm (1.2 in) over approximately 4 days, contributing to an average humidity level of 46%. Enjoy the pleasant climate!

September Temperature in Trenton

In September in Trenton, the average temperature is 17°C (62°F). Maximum temperatures can reach 34°C (93°F), while minimums can drop as low as 0°C (33°F). Be prepared for a wide range of temperatures when planning your travel to Trenton during this month.

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 17°C (62°F), with highs reaching up to 34°C (93°F) and lows dropping to around 0°C (33°F).
JanFebMarAprMayJunJulAugSepOctNovDec232736455466747262463625
Data source: Temperature data for Trenton generated using information from the Copernicus Climate Change Service.
Choose your preferred temperature unit
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 30 mm (1.2 in) over the course of 4 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 30 mm (1.2 inches) of precipitation spread over approximately 4 days.
JanFebMarAprMayJunJulAugSepOctNovDec576850624719101430374246
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
Choose your preferred precipitation unit

September Humidity in Trenton

In Trenton in September, humidity is 46%. With an average temperature of 17°C (62°F), this humidity feels like a refreshing breeze, making it comfortable for exploring the local attractions and enjoying outdoor activities.

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 46%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec91%92%84%75%62%56%44%37%46%67%84%88%
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.
JanFebMarAprMayJunJulAugSepOctNovDec3579101111109643
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 Weather-5°C (24°F)57 mm (2.2 inches)91%moderate
February Weather-3°C (27°F)67 mm (2.7 inches)92%moderate
March Weather2°C (36°F)50 mm (2.0 inches)84%high
April Weather7°C (45°F)62 mm (2.4 inches)74%very high
May Weather12°C (54°F)47 mm (1.9 inches)62%very high
June Weather19°C (66°F)19 mm (0.8 inches)56%extreme
July Weather24°C (75°F)10 mm (0.4 inches)44%extreme
August Weather22°C (72°F)14 mm (0.6 inches)37%very high
September Weather17°C (62°F)30 mm (1.2 inches)46%very high
October Weather8°C (46°F)37 mm (1.5 inches)67%high
November Weather2°C (36°F)42 mm (1.7 inches)84%moderate
December Weather-4°C (25°F)46 mm (1.8 inches)88%moderate

Compare Trenton's Climate with Cities Worldwide