Monthly weather forecast and climate
Simi Valley, CA

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 a comfortable winter month, with average temperature fluctuating between 47.3°F (8.5°C) and 61.3°F (16.3°C). In January, the average high-temperature is essentially the same as in December - a comfortable 61.3°F (16.3°C). Weather in January »

Weather in February

The last month of the winter, February, is another mild month in Simi Valley, California, with average temperature fluctuating between 60.6°F (15.9°C) and 46.6°F (8.1°C). In February, the average high-temperature is essentially the same as in January - a mild 60.6°F (15.9°C). Weather in February »

Weather in March

March, the first month of the spring, in Simi Valley, is a comfortable month, with average temperature ranging between max 63.3°F (17.4°C) and min 47.8°F (8.8°C). In Simi Valley, the average high-temperature in March is practically the same as in February - a comfortable 63.3°F (17.4°C). Weather in March »

Weather in April

April, the same as March, is another enjoyable spring month in Simi Valley, California, with average temperature ranging between min 50.4°F (10.2°C) and max 66.7°F (19.3°C). In Simi Valley, the average high-temperature is essentially the same as in March - a still enjoyable 66.7°F (19.3°C). Weather in April »

Weather in May

May, the last month of the spring, in Simi Valley, is a pleasant month, with average temperature ranging between min 53.4°F (11.9°C) and max 70.2°F (21.2°C). In Simi Valley, the average high-temperature in May is relatively the same as in April - an agreeable 70.2°F (21.2°C). Weather in May »

Weather in June

The first month of the summer, June, is a warm month in Simi Valley, California, with average temperature fluctuating between 75.6°F (24.2°C) and 57.7°F (14.3°C). In June, the average high-temperature slightly increases, from a pleasant 70.2°F (21.2°C) in May, to a moderately hot 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 average temperature varying between 61.9°F (16.6°C) and 80.8°F (27.1°C). In Simi Valley, the average high-temperature in July is essentially the same as in June - a still moderately hot 80.8°F (27.1°C). Weather in July »

Weather in August

August, the last month of the summer, in Simi Valley, is another warm month, with average temperature ranging between max 82.2°F (27.9°C) and min 63.1°F (17.3°C). The warmest month is August, with an average high-temperature of 82.2°F (27.9°C) and an average low-temperature of 63.1°F (17.3°C). The average heat index in August is estimated at 84°F (28.9°C). Weather in August »

Weather in September

The first month of the autumn, September, is still a warm month in Simi Valley, California, with temperature in the range of an average high of 79.7°F (26.5°C) and an average low of 62.1°F (16.7°C). In Simi Valley, the average high-temperature is practically the same as in August - a still warm 79.7°F (26.5°C). Weather in September »

Weather in October

October, the same as September, is another warm autumn month in Simi Valley, California, with temperature in the range of an average low of 57.6°F (14.2°C) and an average high of 74.1°F (23.4°C). In October, the average high-temperature marginally drops, from 79.7°F (26.5°C) in September, 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 comfortable month in Simi Valley, California, with average temperature ranging between min 51.8°F (11°C) and max 67.5°F (19.7°C). In November, the average high-temperature marginally drops, from a warm 74.1°F (23.4°C) in October, to an enjoyable 67.5°F (19.7°C). Weather in November »

Weather in December

The first month of the winter, December, is also a moderate month in Simi Valley, California, with temperature in the range of an average high of 60.1°F (15.6°C) and an average low of 46.4°F (8°C). December is the coldest month, with an average high-temperature of 60.1°F (15.6°C) and an average low-temperature of 46.4°F (8°C). Weather in December »
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FAQ

How many days 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 is the month 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, California.

What is the rainiest month in Simi Valley?

The month with the most rainfall in Simi Valley, California, is February when the rain falls for 5.8 days and typically aggregates up to 1.93" (49mm) of precipitation.

What is the most humid month in Simi Valley?

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

What is the driest month in Simi Valley?

The month with the least rainfall 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?

The month with the longest days in Simi Valley is June, with an average of 14.4h of daylight.

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

Months with the most sunshine are June and July, with an average of 12.1h of sunshine.

When is the highest UV index in Simi Valley?

Months with the highest UV index are June through August, with an average maximum UV index of 6.

What is the warmest month in Simi Valley?

August is the warmest month in Simi Valley, California, with an average high-temperature of 82.2°F (27.9°C) and an average low-temperature of 63.1°F (17.3°C).

What is the least humid month in Simi Valley?

November is the least humid month, with an average relative humidity of 50%.

What is the coldest month in Simi Valley?

With an average high-temperature of 60.1°F (15.6°C) and an average low-temperature of 46.4°F (8°C), December is the coldest month.

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

December has the shortest days of the year, with an average of 9.9h of daylight.

What is the month with the lowest UV index in Simi Valley?

The month with the lowest UV index in Simi Valley is December, 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").
Months with the lowest atmospheric pressure are June and September (29.9").

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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).
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: 14.4h).
The month with the shortest days is December (Average daylight: 9.9h).

Months with the most sunshine are June and July (Average sunshine: 12.1h).
Months with the least sunshine are January, February and December (Average sunshine: 6.8).

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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

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

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