September Weather in Westwood, United States

Last updated: June 24, 2025

In September, the average temperature in Westwood, United States is a pleasant 16°C (62°F). However, temperatures can swing dramatically, ranging from a chilly -1°C (30°F) to a sweltering 35°C (96°F). Expect some moisture as well, with an average precipitation of 19 mm (0.7 in) spread over 3 days. The air is relatively comfortable, featuring an average humidity of 46%.

September Temperature in Westwood

In September in Westwood, the average temperature is 16°C (62°F). Maximum temperatures can reach 35°C (96°F), while minimums can drop as low as -1°C (30°F). Travelers should be prepared for a wide range of weather conditions during their visit.

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 16°C (62°F), with highs reaching up to 35°C (96°F) and lows dropping to around -1°C (30°F).

Data source: Temperature data for Westwood generated using information from the Copernicus Climate Change Service.

September Precipitation in Westwood

In Westwood in September, the precipitation amount is 19 mm (0.7 in) over a period of 3 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 19 mm (0.7 inches) of precipitation spread over approximately 3 days.

Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.

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Millimeters (mm) Inches (in)

September Humidity in Westwood

In Westwood in September, humidity is 46%. With an average temperature of 16°C (62°F), this humidity feels like a mild and refreshing embrace, making it a comfortable time for traveling as you can explore the sights without feeling overly sticky or fatigued.

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 46%, offering insight into how humid the weather typically is during this month.

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 9, which corresponds to a very high Exposure Category. The time to burn is just 15 minutes, so it's essential to take precautions. For 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 9, which falls under the very high exposure category.

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.
	Temperature	Precipitation	Humidity	UV
January Weather	0°C (31°F)	162 mm (6.4 inches)	86%	moderate
February Weather	0°C (32°F)	176 mm (6.9 inches)	87%	moderate
March Weather	2°C (35°F)	143 mm (5.6 inches)	86%	very high
April Weather	6°C (43°F)	73 mm (2.9 inches)	83%	very high
May Weather	11°C (53°F)	58 mm (2.3 inches)	72%	extreme
June Weather	17°C (64°F)	16 mm (0.6 inches)	67%	extreme
July Weather	22°C (72°F)	6 mm (0.2 inches)	56%	extreme
August Weather	21°C (70°F)	8 mm (0.3 inches)	42%	extreme
September Weather	16°C (62°F)	19 mm (0.7 inches)	46%	very high
October Weather	9°C (49°F)	42 mm (1.6 inches)	67%	high
November Weather	4°C (39°F)	79 mm (3.1 inches)	86%	moderate
December Weather	-1°C (30°F)	131 mm (5.2 inches)	86%	moderate