October Weather in Simi Valley, United States

Last updated: June 24, 2025

In October, the average temperature in Simi Valley, United States is a pleasant 20°C (68°F). However, temperatures can fluctuate significantly, with a minimum of 7°C (45°F) and a maximum reaching up to 38°C (101°F). Expect 10 mm (0.4 in) of precipitation over just 1 day, accompanied by an average humidity of 59%, making for a diverse and dynamic climate experience.

October Temperature in Simi Valley

In October in Simi Valley, the average temperature is 20°C (68°F), with maximums reaching up to 38°C (101°F) and minimums dropping as low as 7°C (45°F). It's important to pack for a range of temperatures to ensure comfort during your travels.

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

The chart illustrates October 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, October typically has an average temperature of 20°C (68°F), with highs reaching up to 38°C (101°F) and lows dropping to around 7°C (45°F).

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

October Precipitation in Simi Valley

In Simi Valley in October, the precipitation amount is 10 mm (0.4 in) over the course of 1 day.

October Precipitation Trends in Simi Valley

The chart displays monthly precipitation patterns in Simi Valley, with values for each month alongside October’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how October’s conditions compare to those of other months. In Simi Valley, October typically receives around 10 mm (0.4 inches) of precipitation spread over approximately 1 days.

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

Choose your preferred precipitation unit

Millimeters (mm) Inches (in)

October Humidity in Simi Valley

In Simi Valley in October, humidity is 59%. With an average temperature of 20°C (68°F), this humidity feels like a warm embrace, creating a slightly muggy atmosphere that can be a bit stifling for outdoor activities, yet refreshing during cooler, shaded moments, making it ideal for leisurely sightseeing and exploration in the early mornings or late afternoons.

October Average Humidity in Simi Valley

This chart illustrates the average monthly humidity levels in Simi Valley, with October’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In October, average humidity in Simi Valley is approximately 59%, offering insight into how humid the weather typically is during this month.

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

October UV Index in Simi Valley

In Simi Valley in October, the maximum UV index is 7, which corresponds to the high Exposure Category. This means that the time to burn is approximately 25 minutes. For more detailed information, you can check the Hourly UV Index in Simi Valley.

Maximum UV Index Levels in Simi Valley for October

The chart shows the monthly maximum UV Index (UVI) for Simi Valley in October, 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 October, the maximum UV index in Simi Valley typically reaches 7, which falls under the high exposure category.

Data source: Simi Valley October 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 October 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 October’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 October’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