nomadseason

September Weather in College Place, United States

Last updated: June 24, 2025

In September, the average temperature in College Place, United States hovers around 19°C (66°F). While you might enjoy comfortable days, be prepared for temperatures to dip as low as 4°C (40°F) or rise to a scorching 38°C (100°F). Expect light rainfall, with 16 mm (0.6 in) of precipitation spread over 3 days. Moreover, the average humidity sits at a pleasant 58%, making it an appealing time to explore the region!

September Temperature in College Place

In September in College Place, the average temperature is 19°C (66°F). The maximum can reach 38°C (100°F), while the minimum can drop to as low as 4°C (40°F). Be prepared for a wide range of temperatures to ensure a comfortable travel experience.

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

The chart illustrates September temperature patterns in College Place, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In College Place, September typically has an average temperature of 19°C (66°F), with highs reaching up to 38°C (100°F) and lows dropping to around 4°C (40°F).
JanFebMarAprMayJunJulAugSepOctNovDec373745526170787666534437
Data source: Temperature data for College Place 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 College Place

In College Place in September, the precipitation amount is 16 mm (0.6 in), spread over a duration of 3 days.

September Precipitation Trends in College Place

The chart displays monthly precipitation patterns in College Place, 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 Place, September typically receives around 16 mm (0.6 inches) of precipitation spread over approximately 3 days.
JanFebMarAprMayJunJulAugSepOctNovDec4979473627140616385456
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
Choose your preferred precipitation unit

September Humidity in College Place

In College Place in September, humidity is 58%. With an average temperature of 19°C (66°F), this humidity feels like a mild embrace, creating a pleasantly warm atmosphere that's perfect for leisurely strolls and sightseeing adventures.

September Average Humidity in College Place

This chart illustrates the average monthly humidity levels in College Place, 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 Place is approximately 58%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec86%86%85%83%77%81%77%60%58%75%85%87%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in College Place

In College Place in September, the maximum UV index is 7, which corresponds to the high Exposure Category. This means that the time to burn is approximately 25 minutes. For more detailed information, you can check the Hourly UV Index in College Place.

Maximum UV Index Levels in College Place for September

The chart shows the monthly maximum UV Index (UVI) for College Place 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 Place typically reaches 7, which falls under the high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec24679101097532
Data source: College Place 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 Place Compares to Other Months

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

This table compares monthly weather conditions in College Place, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather3°C (37°F)49 mm (1.9 inches)86%low
February Weather3°C (38°F)79 mm (3.1 inches)86%moderate
March Weather7°C (45°F)47 mm (1.9 inches)85%high
April Weather11°C (52°F)36 mm (1.4 inches)83%high
May Weather16°C (61°F)27 mm (1.1 inches)77%very high
June Weather21°C (70°F)14 mm (0.5 inches)81%very high
July Weather26°C (78°F)0 mm (0.0 inches)76%very high
August Weather25°C (76°F)6 mm (0.2 inches)60%very high
September Weather19°C (66°F)16 mm (0.6 inches)58%high
October Weather11°C (53°F)38 mm (1.5 inches)75%moderate
November Weather6°C (44°F)54 mm (2.1 inches)85%moderate
December Weather3°C (37°F)55 mm (2.2 inches)87%low

Compare College Place's Climate with Cities Worldwide