July Weather in Simi Valley, United States

Last updated: June 24, 2025

In July, the average temperature in Simi Valley, United States reaches a pleasant 23°C (74°F). However, temperatures can vary significantly, with a minimum of 13°C (56°F) and a scorching maximum of 42°C (108°F). The region experiences minimal precipitation, with only 1 mm (0.0 in) recorded during 0 days of the month. Enjoy the comfortable weather with an average humidity of 46%!

July Temperature in Simi Valley

In July in Simi Valley, the average temperature is 23°C (74°F), with maximums reaching up to 42°C (108°F) and minimums dropping to as low as 13°C (56°F). This variety in temperatures makes it advisable for travelers to pack both light clothing for the heat and warmer layers for cooler evenings.

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

The chart illustrates July 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, July typically has an average temperature of 23°C (74°F), with highs reaching up to 42°C (108°F) and lows dropping to around 13°C (56°F).

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

July Precipitation in Simi Valley

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

July Precipitation Trends in Simi Valley

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

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

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Millimeters (mm) Inches (in)

July Humidity in Simi Valley

In Simi Valley in July humidity is 46%. With an average temperature of 23°C (74°F), this humidity feels like a mild and pleasant embrace, making it comfortable for exploring the sights and indulging in outdoor activities without feeling overly sticky or weighed down.

July Average Humidity in Simi Valley

This chart illustrates the average monthly humidity levels in Simi Valley, with July’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In July, average humidity in Simi Valley is approximately 46%, offering insight into how humid the weather typically is during this month.

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

July UV Index in Simi Valley

In Simi Valley in July, the maximum UV index is 12, which corresponds to an extreme Exposure Category. The time to burn is just 10 minutes, underscoring the importance of sun protection. For detailed information, you can check the Hourly UV Index in Simi Valley.

Maximum UV Index Levels in Simi Valley for July

The chart shows the monthly maximum UV Index (UVI) for Simi Valley in July, 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 July, the maximum UV index in Simi Valley typically reaches 12, which falls under the extreme exposure category.

Data source: Simi Valley July 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 July 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 July’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 July’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