September Weather in Westlake, United States

Last updated: June 24, 2025

In Westlake, United States, the average temperature in September hovers around 26°C (79°F). Expect a range from a cool 13°C (56°F) to a sizzling 35°C (95°F). This month sees an average precipitation of 174 mm (6.8 in) over 14 days, accompanied by a 72% average humidity level. Stay prepared for a mix of warm days and refreshing showers!

September Temperature in Westlake

In September in Westlake, the average temperature is 26°C (79°F). Maximums can reach 35°C (95°F), and minimums can be as low as 13°C (56°F). This mild climate makes it an ideal time for outdoor adventures and sightseeing.

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

The chart illustrates September temperature patterns in Westlake, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Westlake, September typically has an average temperature of 26°C (79°F), with highs reaching up to 35°C (95°F) and lows dropping to around 13°C (56°F).

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

September Precipitation in Westlake

In Westlake in September, the total precipitation amount is 174 mm (6.8 in) spread over 14 days.

September Precipitation Trends in Westlake

The chart displays monthly precipitation patterns in Westlake, 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 Westlake, September typically receives around 174 mm (6.8 inches) of precipitation spread over approximately 14 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 Westlake

In Westlake in September, humidity is 72%. With an average temperature of 26°C (79°F), this humidity feels like a warm blanket wrapping around you, making outdoor activities feel a bit more strenuous but also adding a tropical charm to your travels.

September Average Humidity in Westlake

This chart illustrates the average monthly humidity levels in Westlake, 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 Westlake is approximately 72%, 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 Westlake

In Westlake 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 Westlake.

Maximum UV Index Levels in Westlake for September

The chart shows the monthly maximum UV Index (UVI) for Westlake 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 Westlake typically reaches 10, which falls under the very high exposure category.

Data source: Westlake 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 Westlake Compares to Other Months

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

This table compares monthly weather conditions in Westlake, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	12°C (53°F)	117 mm (4.6 inches)	81%	moderate
February Weather	14°C (58°F)	110 mm (4.3 inches)	81%	very high
March Weather	18°C (65°F)	78 mm (3.1 inches)	79%	very high
April Weather	20°C (69°F)	152 mm (6.0 inches)	80%	very high
May Weather	25°C (77°F)	206 mm (8.1 inches)	81%	extreme
June Weather	27°C (81°F)	168 mm (6.6 inches)	76%	extreme
July Weather	28°C (83°F)	159 mm (6.2 inches)	73%	extreme
August Weather	28°C (83°F)	182 mm (7.2 inches)	71%	extreme
September Weather	26°C (79°F)	174 mm (6.8 inches)	72%	very high
October Weather	22°C (72°F)	124 mm (4.9 inches)	73%	very high
November Weather	16°C (60°F)	71 mm (2.8 inches)	83%	high
December Weather	14°C (57°F)	126 mm (5.0 inches)	88%	moderate