August Weather in Simi Valley, United States

Last updated: June 24, 2025

In August, the average temperature in Simi Valley, United States is a pleasant 24°C (75°F), with a range that can dip to a minimum of 16°C (61°F) and peak at a scorching 39°C (102°F). Expect minimal precipitation at just 1 mm (0.0 in) over 0 days, complemented by an average humidity of 39%.

August Temperature in Simi Valley

In August in Simi Valley, the average temperature is 24°C (75°F), with maximums reaching up to 39°C (102°F) and minimums dropping as low as 16°C (61°F). This pleasant climate makes Simi Valley a great destination for travelers seeking warm weather and enjoyable outdoor activities.

August Weather in Simi Valley: Daily Temperature Highs, Lows, and Averages

The chart illustrates August temperature patterns in Simi Valley, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Simi Valley, August typically has an average temperature of 24°C (75°F), with highs reaching up to 39°C (102°F) and lows dropping to around 16°C (61°F).

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

August Precipitation in Simi Valley

In Simi Valley in August, the precipitation amount is 1 mm (0.0 in) during a span of 0 days.

August Precipitation Trends in Simi Valley

The chart displays monthly precipitation patterns in Simi Valley, with values for each month alongside August’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how August’s conditions compare to those of other months. In Simi Valley, August typically receives around 1 mm (0.0 inches) of precipitation spread over approximately 0 days.

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

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Millimeters (mm) Inches (in)

August Humidity in Simi Valley

In Simi Valley in August humidity is 39%. With an average temperature of 24°C (75°F), this humidity feels like a comfortable embrace, making it pleasant for traveling as the air remains fresh and invigorating, ideal for exploring without breaking a sweat.

August Average Humidity in Simi Valley

This chart illustrates the average monthly humidity levels in Simi Valley, with August’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In August, average humidity in Simi Valley is approximately 39%, offering insight into how humid the weather typically is during this month.

Data source: Humidity data for August generated using information from the Copernicus Climate Change Service.

August UV Index in Simi Valley

In Simi Valley in August, the maximum UV index reaches 11, which corresponds to an extreme Exposure Category. With a time to burn of just 10 minutes, it's essential to take precautions. For more details, you can check the Hourly UV Index in Simi Valley.

Maximum UV Index Levels in Simi Valley for August

The chart shows the monthly maximum UV Index (UVI) for Simi Valley in August, 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 August, the maximum UV index in Simi Valley typically reaches 11, which falls under the extreme exposure category.

Data source: Simi Valley August 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 August Weather in Simi Valley Compares to Other Months

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

This table compares monthly weather conditions in Simi Valley, showing how August’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	13°C (55°F)	79 mm (3.1 inches)	78%	moderate
February Weather	13°C (55°F)	63 mm (2.5 inches)	82%	high
March Weather	14°C (57°F)	80 mm (3.2 inches)	75%	very high
April Weather	17°C (62°F)	20 mm (0.8 inches)	68%	very high
May Weather	17°C (64°F)	15 mm (0.6 inches)	57%	extreme
June Weather	20°C (69°F)	2 mm (0.1 inches)	52%	extreme
July Weather	23°C (74°F)	1 mm (0.0 inches)	46%	extreme
August Weather	24°C (75°F)	1 mm (0.0 inches)	39%	extreme
September Weather	22°C (73°F)	2 mm (0.1 inches)	48%	very high
October Weather	20°C (68°F)	10 mm (0.4 inches)	59%	high
November Weather	16°C (62°F)	19 mm (0.7 inches)	72%	moderate
December Weather	12°C (55°F)	86 mm (3.4 inches)	76%	moderate