June Weather in Simi Valley, United States

Last updated: June 24, 2025

In June, the average temperature in Simi Valley, United States is a pleasant 20°C (69°F). Daytime warmth can soar to a maximum of 37°C (99°F), while cool nights may drop to a minimum of 11°C (52°F). With an average humidity of 52% and just 2 mm (0.1 in) of precipitation over 0 days, it's an ideal time to enjoy the outdoors!

June Temperature in Simi Valley

In June in Simi Valley, the average temperature is 20°C (69°F). Maximums can reach 37°C (99°F) and minimums can be as low as 11°C (52°F). It's advisable to pack both light clothing for the warm days and a light jacket for the cooler evenings when traveling during this time.

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

The chart illustrates June 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, June typically has an average temperature of 20°C (69°F), with highs reaching up to 37°C (99°F) and lows dropping to around 11°C (52°F).

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

June Precipitation in Simi Valley

In Simi Valley in June, the precipitation amount is 2 mm (0.1 in) during a span of 0 days.

June Precipitation Trends in Simi Valley

The chart displays monthly precipitation patterns in Simi Valley, with values for each month alongside June’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how June’s conditions compare to those of other months. In Simi Valley, June typically receives around 2 mm (0.1 inches) of precipitation spread over approximately 0 days.

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

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Millimeters (mm) Inches (in)

June Humidity in Simi Valley

In Simi Valley in June humidity is 52%. With an average temperature of 20°C (69°F), this humidity feels like a pleasant embrace, making it comfortable for traveling, allowing for enjoyable outdoor exploration without excessive discomfort.

June Average Humidity in Simi Valley

This chart illustrates the average monthly humidity levels in Simi Valley, with June’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In June, average humidity in Simi Valley is approximately 52%, offering insight into how humid the weather typically is during this month.

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

June UV Index in Simi Valley

In Simi Valley in June, 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 June

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

Data source: Simi Valley June 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 June 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 June’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 June’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