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September Weather in College, United States

Last updated: June 24, 2025

In September, the average temperature in College, United States is a crisp 9°C (48°F), with a potential drop to a chilly -8°C (18°F) and a peak of a pleasant 23°C (74°F). Expect around 43 mm (1.7 in) of precipitation spread over 9 days, while the air feels notably humid at an average of 90%.

September Temperature in College

In September in College, the average temperature is 9°C (48°F). The maximum can reach 23°C (74°F), while the minimum can dip as low as -8°C (18°F). This wide range of temperatures suggests that travelers should prepare for both warm and cold conditions when visiting.

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

The chart illustrates September temperature patterns in College, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In College, September typically has an average temperature of 9°C (48°F), with highs reaching up to 23°C (74°F) and lows dropping to around -8°C (18°F).
JanFebMarAprMayJunJulAugSepOctNovDec-321433526365584833115
Data source: Temperature data for College 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 College

In College in September, the precipitation amount reaches 43 mm (1.7 in) over the course of 9 days.

September Precipitation Trends in College

The chart displays monthly precipitation patterns in College, 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 College, September typically receives around 43 mm (1.7 inches) of precipitation spread over approximately 9 days.
JanFebMarAprMayJunJulAugSepOctNovDec1324212024564910443393133
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
Choose your preferred precipitation unit

September Humidity in College

In College in September, humidity is 90%. With an average temperature of 9°C (48°F), this humidity feels like a damp chill that seeps into your bones, making outdoor exploration quite uncomfortable and requiring heavier layers to stay warm and dry.

September Average Humidity in College

This chart illustrates the average monthly humidity levels in College, 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 College is approximately 90%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec97%93%89%85%77%78%85%88%90%97%100%99%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in College

In College in September, the maximum UV index is 3, which corresponds to a moderate Exposure Category. The time to burn is approximately 30 minutes. For more details on the hourly UV index in College, you can check the information here.

Maximum UV Index Levels in College for September

The chart shows the monthly maximum UV Index (UVI) for College 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 College typically reaches 3, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec112355553211
Data source: College 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 College Compares to Other Months

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

This table compares monthly weather conditions in College, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-19°C (-2°F)13 mm (0.5 inches)96%low
February Weather-16°C (3°F)24 mm (1.0 inches)93%low
March Weather-10°C (14°F)21 mm (0.8 inches)89%low
April Weather0°C (33°F)20 mm (0.8 inches)85%moderate
May Weather11°C (52°F)24 mm (0.9 inches)77%moderate
June Weather17°C (63°F)56 mm (2.2 inches)78%moderate
July Weather18°C (66°F)49 mm (1.9 inches)85%moderate
August Weather14°C (58°F)104 mm (4.1 inches)88%moderate
September Weather9°C (48°F)43 mm (1.7 inches)90%moderate
October Weather0°C (33°F)39 mm (1.5 inches)97%low
November Weather-12°C (11°F)31 mm (1.2 inches)100%low
December Weather-15°C (5°F)33 mm (1.3 inches)99%low

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