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September Weather in West Salem, United States

Last updated: June 24, 2025

In September, the average temperature in West Salem, United States hovers around 18°C (64°F). Expect a cool minimum of 3°C (38°F) and a warm maximum reaching up to 33°C (92°F). This month sees approximately 105 mm (4.1 in) of precipitation spread over 10 days, with an average humidity level of 74%.

September Temperature in West Salem

In September in West Salem, the average temperature is 18°C (64°F). The maximum can reach 33°C (92°F), and the minimum can be as low as 3°C (38°F). This is a great time to pack both light clothing for the warm afternoons and a warmer layer for the cooler evenings while enjoying your travels.

September Weather in West Salem: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in West Salem, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In West Salem, September typically has an average temperature of 18°C (64°F), with highs reaching up to 33°C (92°F) and lows dropping to around 3°C (38°F).
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Data source: Temperature data for West Salem 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 West Salem

In West Salem in September, the precipitation amount is 105 mm (4.1 in) over the course of 10 days.

September Precipitation Trends in West Salem

The chart displays monthly precipitation patterns in West Salem, 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 West Salem, September typically receives around 105 mm (4.1 inches) of precipitation spread over approximately 10 days.
JanFebMarAprMayJunJulAugSepOctNovDec365057861371261001211051155145
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in West Salem

In West Salem in September humidity is 74%. With an average temperature of 18°C (64°F), this humidity feels like a warm embrace, making it ideal for leisurely strolls but potentially uncomfortable for extended outdoor activities.

September Average Humidity in West Salem

This chart illustrates the average monthly humidity levels in West Salem, 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 West Salem is approximately 74%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec84%85%84%83%75%79%75%69%74%79%88%82%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in West Salem

In West Salem 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 West Salem.

Maximum UV Index Levels in West Salem for September

The chart shows the monthly maximum UV Index (UVI) for West Salem 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 West Salem typically reaches 7, which falls under the high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec24589101097532
Data source: West Salem 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 West Salem Compares to Other Months

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

This table compares monthly weather conditions in West Salem, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-7°C (19°F)36 mm (1.4 inches)84%low
February Weather-6°C (21°F)50 mm (2.0 inches)85%moderate
March Weather2°C (35°F)57 mm (2.2 inches)84%moderate
April Weather7°C (45°F)86 mm (3.4 inches)83%very high
May Weather15°C (59°F)137 mm (5.4 inches)75%very high
June Weather21°C (71°F)125 mm (4.9 inches)79%very high
July Weather23°C (74°F)100 mm (3.9 inches)75%very high
August Weather21°C (70°F)121 mm (4.8 inches)69%very high
September Weather18°C (64°F)105 mm (4.1 inches)74%high
October Weather10°C (50°F)114 mm (4.5 inches)79%moderate
November Weather2°C (35°F)51 mm (2.0 inches)88%moderate
December Weather-3°C (27°F)45 mm (1.8 inches)82%low

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