January Weather in Simi Valley, United States

Last updated: June 24, 2025

In Simi Valley, United States, the average temperature in January is a comfortable 13°C (55°F). However, temperatures can fluctuate, with a minimum of 2°C (35°F) and a maximum reaching up to 31°C (88°F). Expect around 79 mm (3.1 in) of precipitation spread across 5 days, coupled with an average humidity level of 78%. Ideal weather for exploring this vibrant locale!

January Temperature in Simi Valley

In January, in Simi Valley, the average temperature is 13°C (55°F). The maximum can reach 31°C (88°F), while the minimum can drop as low as 2°C (35°F). This temperature range makes Simi Valley a versatile destination, perfect for travelers looking for both warm days and cooler evenings.

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

The chart illustrates January 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, January typically has an average temperature of 13°C (55°F), with highs reaching up to 31°C (88°F) and lows dropping to around 2°C (35°F).

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

January Precipitation in Simi Valley

In Simi Valley in January, the precipitation amount is 79 mm (3.1 in) over a span of 5 days.

January Precipitation Trends in Simi Valley

The chart displays monthly precipitation patterns in Simi Valley, with values for each month alongside January’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how January’s conditions compare to those of other months. In Simi Valley, January typically receives around 79 mm (3.1 inches) of precipitation spread over approximately 5 days.

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

Choose your preferred precipitation unit

Millimeters (mm) Inches (in)

January Humidity in Simi Valley

In Simi Valley in January, humidity is 78%. With an average temperature of 13°C (55°F), this humidity feels like a damp blanket enveloping you, making outdoor activities feel steamy and your clothes cling uncomfortably, often leaving you longing for a cool breeze or an air-conditioned escape while exploring.

January Average Humidity in Simi Valley

This chart illustrates the average monthly humidity levels in Simi Valley, with January’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In January, average humidity in Simi Valley is approximately 78%, offering insight into how humid the weather typically is during this month.

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

January UV Index in Simi Valley

In Simi Valley in January, the maximum UV index reaches 4, which corresponds to a moderate Exposure Category. With a time to burn of 30 minutes, it’s important to take precautions to protect your skin. You can find more details in the Hourly UV Index in Simi Valley for better planning.

Maximum UV Index Levels in Simi Valley for January

The chart shows the monthly maximum UV Index (UVI) for Simi Valley in January, 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 January, the maximum UV index in Simi Valley typically reaches 4, which falls under the moderate exposure category.

Data source: Simi Valley January 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 January 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 January’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 January’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