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September Weather in Westwood, United States

Last updated: June 24, 2025

In September, the average temperature in Westwood, United States hovers around 19°C (66°F), offering a comfortable climate for outdoor activities. Expect temperatures to range from a brisk 2°C (36°F) to a warm 34°C (94°F). Rainfall is moderate, with an average precipitation of 88 mm (3.5 in) spread across approximately 10 days. With an average humidity of 79%, the air can feel a bit heavy, adding to the overall charm of the season.

September Temperature in Westwood

In September in Westwood, the average temperature is 19°C (66°F), with maximums reaching 34°C (94°F) and minimums dipping as low as 2°C (36°F). Be prepared for a wide range of temperatures when planning your travel.

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

The chart illustrates September temperature patterns in Westwood, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Westwood, September typically has an average temperature of 19°C (66°F), with highs reaching up to 34°C (94°F) and lows dropping to around 2°C (36°F).
JanFebMarAprMayJunJulAugSepOctNovDec272837476070747266543933
Data source: Temperature data for Westwood 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 Westwood

In Westwood in September, the precipitation amount is 88 mm (3.5 in) spread over a duration of 10 days.

September Precipitation Trends in Westwood

The chart displays monthly precipitation patterns in Westwood, 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 Westwood, September typically receives around 88 mm (3.5 inches) of precipitation spread over approximately 10 days.
JanFebMarAprMayJunJulAugSepOctNovDec7475869915813111183881417266
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Westwood

In Westwood in September humidity is 79%. With an average temperature of 19°C (66°F), this humidity feels like a warm embrace, making it feel much warmer than the actual temperature and creating a heavy, sticky atmosphere that can be a bit uncomfortable for traveling.

September Average Humidity in Westwood

This chart illustrates the average monthly humidity levels in Westwood, 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 Westwood is approximately 79%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec87%87%86%87%82%81%78%79%80%82%87%86%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Westwood

In Westwood 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 Westwood.

Maximum UV Index Levels in Westwood for September

The chart shows the monthly maximum UV Index (UVI) for Westwood 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 Westwood typically reaches 7, which falls under the high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec34689101097532
Data source: Westwood 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 Westwood Compares to Other Months

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

This table compares monthly weather conditions in Westwood, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-3°C (27°F)74 mm (2.9 inches)87%moderate
February Weather-2°C (28°F)75 mm (3.0 inches)87%moderate
March Weather3°C (38°F)86 mm (3.4 inches)86%high
April Weather8°C (47°F)99 mm (3.9 inches)87%very high
May Weather15°C (60°F)158 mm (6.2 inches)82%very high
June Weather21°C (71°F)131 mm (5.1 inches)81%very high
July Weather24°C (75°F)111 mm (4.4 inches)78%very high
August Weather22°C (72°F)83 mm (3.3 inches)79%very high
September Weather19°C (66°F)88 mm (3.5 inches)79%high
October Weather12°C (54°F)141 mm (5.6 inches)82%moderate
November Weather4°C (39°F)72 mm (2.8 inches)87%moderate
December Weather1°C (33°F)65 mm (2.6 inches)86%low

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