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September Weather in West, United States

Last updated: June 24, 2025

In September, the average temperature in West, United States reaches a warm 27°C (81°F). Be prepared for variations, as temperatures can dip to a cool 10°C (51°F) and soar to a scorching 39°C (103°F). Expect some shower activity, with an average precipitation of 76 mm (3.0 in) spread over 8 days. The air remains comfortably humid with an average humidity level of 69%.

September Temperature in West

In September in West, the average temperature is 27°C (81°F). The maximum can reach 39°C (103°F), while the minimum can be as low as 10°C (51°F). Travelers should be prepared for hot days and cool nights, making it essential to pack layers for varying temperatures.

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

The chart illustrates September temperature patterns in West, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In West, September typically has an average temperature of 27°C (81°F), with highs reaching up to 39°C (103°F) and lows dropping to around 10°C (51°F).
JanFebMarAprMayJunJulAugSepOctNovDec495162677582868681705954
Data source: Temperature data for West 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

In West in September, the precipitation amount is 76 mm (3.0 in) spread over a duration of 8 days.

September Precipitation Trends in West

The chart displays monthly precipitation patterns in West, 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, September typically receives around 76 mm (3.0 inches) of precipitation spread over approximately 8 days.
JanFebMarAprMayJunJulAugSepOctNovDec638684104171765483761275363
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in West

In West in September, humidity is 69%. With an average temperature of 27°C (81°F), this humidity feels like a warm blanket wrapped around you, making it essential to stay hydrated and take frequent breaks during your travels.

September Average Humidity in West

This chart illustrates the average monthly humidity levels in West, 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 is approximately 69%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec80%80%78%79%81%77%71%67%69%73%82%87%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in West

In West in September, the maximum UV index reaches 10, which corresponds to a very high Exposure Category. With a time to burn of just 15 minutes, it's crucial to take precautions. For more detailed information, you can check the Hourly UV Index in West.

Maximum UV Index Levels in West for September

The chart shows the monthly maximum UV Index (UVI) for West 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 typically reaches 10, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec478101112121110864
Data source: West 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 Compares to Other Months

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

This table compares monthly weather conditions in West, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather10°C (49°F)63 mm (2.5 inches)79%moderate
February Weather11°C (51°F)86 mm (3.4 inches)80%high
March Weather17°C (62°F)84 mm (3.3 inches)78%very high
April Weather19°C (67°F)104 mm (4.1 inches)79%very high
May Weather24°C (76°F)171 mm (6.7 inches)81%extreme
June Weather28°C (83°F)76 mm (3.0 inches)77%extreme
July Weather30°C (87°F)54 mm (2.1 inches)71%extreme
August Weather30°C (87°F)83 mm (3.3 inches)67%extreme
September Weather27°C (81°F)76 mm (3.0 inches)69%very high
October Weather21°C (70°F)127 mm (5.0 inches)73%very high
November Weather15°C (59°F)53 mm (2.1 inches)82%high
December Weather12°C (54°F)62 mm (2.5 inches)87%moderate

Compare West's Climate with Cities Worldwide