September Weather in Poway, United States

Last updated: June 24, 2025

In September, the average temperature in Poway, United States is a pleasant 22°C (73°F). Expect a minimum of 12°C (54°F) and the potential for highs reaching 40°C (104°F). Rainfall is modest, with about 5 mm (0.2 in) of precipitation occurring over 1 day, while the average humidity hovers around 52%.

September Temperature in Poway

In September, in Poway, the average temperature is 22°C (73°F). Maximums can reach 40°C (104°F), while minimums can dip as low as 12°C (54°F). It's ideal for travelers seeking warm weather, but be prepared for both hot and cooler spells.

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

The chart illustrates September temperature patterns in Poway, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Poway, September typically has an average temperature of 22°C (73°F), with highs reaching up to 40°C (104°F) and lows dropping to around 12°C (54°F).

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

September Precipitation in Poway

In Poway in September, the precipitation amount is 5 mm (0.2 in) over a duration of 1 day.

September Precipitation Trends in Poway

The chart displays monthly precipitation patterns in Poway, 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 Poway, September typically receives around 5 mm (0.2 inches) of precipitation spread over approximately 1 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 Poway

In Poway in September humidity is 52%. With an average temperature of 22°C (73°F), this humidity feels like a comfortable blanket, making it ideal for leisurely explorations and outdoor activities as long as you're hydrated and take breaks in the shade.

September Average Humidity in Poway

This chart illustrates the average monthly humidity levels in Poway, 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 Poway is approximately 52%, 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 Poway

In Poway 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 Poway.

Maximum UV Index Levels in Poway for September

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

Data source: Poway 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 Poway Compares to Other Months

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

This table compares monthly weather conditions in Poway, 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 (55°F)	73 mm (2.9 inches)	72%	moderate
February Weather	12°C (55°F)	88 mm (3.5 inches)	77%	high
March Weather	14°C (57°F)	76 mm (3.0 inches)	67%	very high
April Weather	16°C (61°F)	35 mm (1.4 inches)	56%	very high
May Weather	17°C (63°F)	30 mm (1.2 inches)	46%	extreme
June Weather	20°C (68°F)	4 mm (0.2 inches)	48%	extreme
July Weather	23°C (74°F)	4 mm (0.1 inches)	46%	extreme
August Weather	24°C (75°F)	2 mm (0.1 inches)	42%	very high
September Weather	22°C (73°F)	5 mm (0.2 inches)	52%	very high
October Weather	20°C (68°F)	15 mm (0.6 inches)	58%	high
November Weather	16°C (62°F)	39 mm (1.5 inches)	66%	moderate
December Weather	13°C (55°F)	74 mm (2.9 inches)	74%	moderate