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September Weather in Westwood, United States

Last updated: June 24, 2025

In Westwood, United States, the average temperature in September hovers around 21°C (70°F), with extremes ranging from a cool 5°C (42°F) to a sizzling 34°C (93°F). Expect about 109 mm (4.3 in) of precipitation spread over 10 days, and prepare for a typical humidity level of 75%.

September Temperature in Westwood

In September in Westwood, the average temperature is 21°C (70°F), with maximums reaching 34°C (93°F) and minimums dropping as low as 5°C (42°F). This range makes Westwood a perfect destination for travelers seeking both warm days and cooler evenings.

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 21°C (70°F), with highs reaching up to 34°C (93°F) and lows dropping to around 5°C (42°F).
JanFebMarAprMayJunJulAugSepOctNovDec343743536372787570604538
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 109 mm (4.3 in) spread over 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 109 mm (4.3 inches) of precipitation spread over approximately 10 days.
JanFebMarAprMayJunJulAugSepOctNovDec6710810710814111815115710910387103
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 75%. With an average temperature of 21°C (70°F), this humidity feels like a warm, enveloping blanket that makes exploring the area feel slightly sticky, requiring travelers to stay hydrated and take occasional breaks in the shade to fully enjoy their adventures.

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 75%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec84%83%83%81%78%79%74%72%75%81%85%84%
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 8, which corresponds to a very high Exposure Category. This means that the time to burn is only 15 minutes. For more detailed information, you can refer to 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 8, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec356910101098642
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 Weather1°C (35°F)67 mm (2.6 inches)84%moderate
February Weather3°C (38°F)108 mm (4.3 inches)83%moderate
March Weather6°C (43°F)107 mm (4.2 inches)83%high
April Weather12°C (54°F)108 mm (4.2 inches)81%very high
May Weather17°C (64°F)141 mm (5.5 inches)78%very high
June Weather22°C (73°F)118 mm (4.7 inches)79%very high
July Weather25°C (78°F)151 mm (5.9 inches)74%very high
August Weather24°C (75°F)157 mm (6.2 inches)72%very high
September Weather21°C (70°F)109 mm (4.3 inches)75%very high
October Weather15°C (60°F)103 mm (4.0 inches)81%high
November Weather7°C (45°F)87 mm (3.4 inches)85%moderate
December Weather3°C (39°F)103 mm (4.1 inches)84%low

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