Climate and monthly weather forecast
Simi Valley, CA

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The Simi Valley city in California, with a view of the scenic Rocky Peak and hilly ranges
The Simi Valley city in California, with a view of the scenic Rocky Peak and hilly ranges

Weather in January

January in Simi Valley, California, is an enjoyable winter month, with an average temperature ranging between min 47.3°F (8.5°C) and max 61.3°F (16.3°C). The transition into January notes an average high-temperature of a comfortable 61.3°F (16.3°C), revealing a mild distinction from the 60.1°F (15.6°C) in December. Weather in January »

Weather in February

The last month of the winter, February, is also a moderate month in Simi Valley, California, with temperature in the range of an average low of 46.6°F (8.1°C) and an average high of 60.6°F (15.9°C). With February's arrival, Simi Valley's weather records an average high-temperature of a moderate 60.6°F (15.9°C), marking little difference from January's 61.3°F (16.3°C). Weather in February »

Weather in March

March, the first month of the spring in Simi Valley, is an enjoyable month, with temperature in the range of an average high of 63.3°F (17.4°C) and an average low of 47.8°F (8.8°C). As Simi Valley transitions into March, the average high-temperature stands at a still refreshing 63.3°F (17.4°C), offering little variation from the preceding month. Weather in March »

Weather in April

April, the same as March, is another comfortable spring month in Simi Valley, California, with temperature in the range of an average low of 50.4°F (10.2°C) and an average high of 66.7°F (19.3°C). April's weather displays an average high-temperature of a still comfortable 66.7°F (19.3°C), slightly varied from March's 63.3°F (17.4°C). Weather in April »

Weather in May

The last month of the spring, May, is an agreeable month in Simi Valley, California, with temperature in the range of an average high of 70.2°F (21.2°C) and an average low of 53.4°F (11.9°C). The arrival of May is marked by an average high-temperature of a pleasant 70.2°F (21.2°C), bearing a close resemblance to April. Weather in May »

Weather in June

June, the first month of the summer in Simi Valley, is a moderately hot month, with temperature in the range of an average high of 75.6°F (24.2°C) and an average low of 57.7°F (14.3°C). Simi Valley's June weather indicates a minor ascent in high-temperatures, adjusting from an agreeable 70.2°F (21.2°C) in May to a warm 75.6°F (24.2°C). Weather in June »

Weather in July

July, the same as June, is a moderately hot summer month in Simi Valley, California, with an average temperature varying between 61.9°F (16.6°C) and 80.8°F (27.1°C). The shift into July records an average high-temperature of a still moderately hot 80.8°F (27.1°C), subtly varied from June's 75.6°F (24.2°C). Weather in July »

Weather in August

August, the last month of the summer in Simi Valley, is also a moderately hot month, with an average temperature varying between 82.2°F (27.9°C) and 63.1°F (17.3°C). In Simi Valley, the peak average temperatures are observed in August, with a high of 82.2°F (27.9°C) and a low of 63.1°F (17.3°C). August's average heat index is evaluated at 84.2°F (29°C). Weather in August »

Weather in September

September, the first month of the autumn in Simi Valley, is also a moderately hot month, with an average temperature varying between 79.7°F (26.5°C) and 62.1°F (16.7°C). The shift into September uncovers an average high-temperature of a still warm 79.7°F (26.5°C), subtly different from the previous month. Weather in September »

Weather in October

October, the same as September, is another warm autumn month in Simi Valley, California, with an average temperature fluctuating between 74.1°F (23.4°C) and 57.6°F (14.2°C). Start of October brings a slight shift in the average high-temperature, dipping a bit from September's 79.7°F (26.5°C) to a still warm 74.1°F (23.4°C). Weather in October »

Weather in November

The last month of the autumn, November, is another refreshing month in Simi Valley, California, with an average temperature fluctuating between 51.8°F (11°C) and 67.5°F (19.7°C). A modest decline in the average high-temperature is seen during November, decreasing from a moderately hot 74.1°F (23.4°C) in October to an enjoyable 67.5°F (19.7°C). Weather in November »

Weather in December

December, the first month of the winter in Simi Valley, is still a mild month, with an average temperature ranging between min 46.4°F (8°C) and max 60.1°F (15.6°C). Simi Valley's coldest month, December, generally records average temperatures ranging from a high of 60.1°F (15.6°C) to a low of 46.4°F (8°C). Weather in December »
Resources | Updated: Feb 9, 2024 | Published by: Weather U.S.

Frequently asked questions

How much does it rain in Simi Valley?

Throughout the year, in Simi Valley, California, there are 53.7 rainfall days, and 9.61" (244mm) of precipitation is accumulated.

What are the months with the least sunshine in Simi Valley?

January, February and December, with an average of 6.8h of sunshine, are months with the least sunshine in Simi Valley.

What is the rainiest month in Simi Valley?

February is the month with the most rainfall. Rain falls for 5.8 days and accumulates 1.93" (49mm) of precipitation.

When is Daylight Saving Time (DST) in Simi Valley?

On Sunday, March 10. 2024, at 2:00 am, Daylight Saving Time starts in Simi Valley, and the time zone changes from PST to PDT. Daylight Saving Time ends Sunday, November 3. 2024, at 2:00 am, and the time zone reverts from PDT to PST.

What is the most humid month in Simi Valley?

June is the most humid month in Simi Valley, California, with an average relative humidity of 62%.

What is the driest month in Simi Valley?

The month with the least rainfall in Simi Valley is June, when the rain falls for 1.5 days and typically collects 0.08" (2mm) of precipitation.

When are the longest days in Simi Valley?

June has the longest days of the year in Simi Valley, with an average of 14h and 24min of daylight.

What are the months with the most sunshine in Simi Valley?

The months with the most sunshine in Simi Valley are June and July, with an average of 12.1h of sunshine.

What are the months with the highest UV index in Simi Valley?

The months with the highest UV index in Simi Valley are June through August, with an average maximum UV index of 6.

What time of the year is the hottest in Simi Valley?

August, characterized by an average high temperature of 82.2°F (27.9°C) and a low temperature of 63.1°F (17.3°C), is generally the warmest month.

What is the least humid month in Simi Valley?

The least humid month in Simi Valley is November, with an average relative humidity of 50%.

What is the coldest time of year in Simi Valley?

The lowest temperatures are recorded in December, with averages reaching a high of 60.1°F (15.6°C) and a low of 46.4°F (8°C).

What is the month with the shortest days in Simi Valley?

With an average of 9h and 54min of daylight, December has the shortest days of the year in Simi Valley, California.

When is the lowest UV index in Simi Valley?

December is the month with the lowest UV index, with an average maximum UV index of 3.

Average temperature
Simi Valley, CA

Average temperature - Simi Valley, CA

The warmest month (with the highest average high temperature) is August (82.2°F).
The month with the lowest average high temperature is December (60.1°F).

The month with the highest average low temperature is August (63.1°F).
The coldest month (with the lowest average low temperature) is December (46.4°F).

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Average pressure
Simi Valley, CA

Average pressure - Simi Valley, CA

The month with the highest atmospheric pressure is January (30.11"Hg).
The months with the lowest atmospheric pressure are June and September (29.9"Hg).

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Average wind speed
Simi Valley, CA

Average wind speed - Simi Valley, CA

The windiest month (with the highest average wind speed) is December (6.5mph).
The calmest month (with the lowest average wind speed) is August (4.3mph).

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Average rainfall
Simi Valley, CA

Average rainfall - Simi Valley, CA

The wettest month (with the highest rainfall) is February (1.93").
The driest month (with the least rainfall) is June (0.08").

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Average rainfall days
Simi Valley, CA

Average rainfall days - Simi Valley, CA

The month with the highest number of rainy days is March (8 days).
The months with the least rainy days are June and August (1.5 days).

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Average daylight / Average sunshine
Simi Valley, CA

Average daylight / Average sunshine - Simi Valley, CA

The month with the longest days is June (Average daylight: 14h and 24min).
The month with the shortest days is December (Average daylight: 9h and 54min).

The months with the most sunshine are June and July (Average sunshine: 12h and 6min).
The months with the least sunshine are January, February and December (Average sunshine: 6h and 48min).

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Average sunshine days
Simi Valley, CA

Average sunshine days - Simi Valley, CA

The month with the most sunshine days is August (25.4 days).
The month with the least sunshine days is February (20.9 days).

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Average visibility
Simi Valley, CA

Average visibility - Simi Valley, CA

The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).

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Simi Valley, California, USA

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