Monthly weather forecast and climate
Castaic, CA

Weather in January

January in Castaic, California, is an enjoyable winter month, with average temperature fluctuating between 43.9°F (6.6°C) and 61.2°F (16.2°C). In Castaic, the average high-temperature is essentially the same as in December - an enjoyable 61.2°F (16.2°C). Weather in January »

Weather in February

February, the last month of the winter, in Castaic, is also an enjoyable month, with average temperature fluctuating between 42.8°F (6°C) and 61.3°F (16.3°C). In Castaic, the average high-temperature is essentially the same as in January - a still comfortable 61.3°F (16.3°C). Weather in February »

Weather in March

March, the first month of the spring, in Castaic, is also an enjoyable month, with average temperature ranging between min 44.6°F (7°C) and max 64.6°F (18.1°C). In March, the average high-temperature is essentially the same as in February - a still enjoyable 64.6°F (18.1°C). Weather in March »

Weather in April

April is an agreeable spring month in Castaic, California, with average temperature ranging between min 47.5°F (8.6°C) and max 69.6°F (20.9°C). In April, the average high-temperature is practically the same as in March - an agreeable 69.6°F (20.9°C). Weather in April »

Weather in May

May, the last month of the spring, in Castaic, is a moderately hot month, with average temperature varying between 73.9°F (23.3°C) and 51.8°F (11°C). In May, the average high-temperature is relatively the same as in April - a moderately hot 73.9°F (23.3°C). Weather in May »

Weather in June

June, the first month of the summer, in Castaic, is also a moderately hot month, with temperature in the range of an average high of 81.7°F (27.6°C) and an average low of 57.2°F (14°C). In Castaic, the average high-temperature slightly increases, from 73.9°F (23.3°C) in May, to a still warm 81.7°F (27.6°C). Weather in June »

Weather in July

July is a tropical summer month in Castaic, California, with temperature in the range of an average high of 87.3°F (30.7°C) and an average low of 63°F (17.2°C). In Castaic, the average high-temperature slightly increases, from a moderately hot 81.7°F (27.6°C) in June, to a hot 87.3°F (30.7°C). Weather in July »

Weather in August

August, the last month of the summer, in Castaic, is also a hot month, with average temperature ranging between max 88.2°F (31.2°C) and min 63.7°F (17.6°C). With an average high-temperature of 88.2°F (31.2°C) and an average low-temperature of 63.7°F (17.6°C), August is the warmest month. The average heat index is appraised at a hot 89.1°F (31.7°C). Weather in August »

Weather in September

September, the first month of the autumn, in Castaic, is also a moderately hot month, with average temperature ranging between max 84.7°F (29.3°C) and min 61°F (16.1°C). In Castaic, the average high-temperature in September is essentially the same as in August - a warm 84.7°F (29.3°C). Weather in September »

Weather in October

October, like September, in Castaic, California, is another warm autumn month, with average temperature varying between 76.6°F (24.8°C) and 55.8°F (13.2°C). In Castaic, the average high-temperature slightly decreases, from a moderately hot 84.7°F (29.3°C) in September, to a still warm 76.6°F (24.8°C). Weather in October »

Weather in November

November, the last month of the autumn, in Castaic, is also an agreeable month, with average temperature ranging between min 49.1°F (9.5°C) and max 68°F (20°C). In Castaic, California, the average high-temperature marginally drops, from a warm 76.6°F (24.8°C) in October, to an agreeable 68°F (20°C). Weather in November »

Weather in December

December, the first month of the winter, in Castaic, is also a moderate month, with average temperature fluctuating between 59.5°F (15.3°C) and 42.3°F (5.7°C). The coldest month is December, with an average high-temperature of 59.5°F (15.3°C) and an average low-temperature of 42.3°F (5.7°C). Weather in December »
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FAQ

How much does it rain in Castaic?

In Castaic, during the entire year, the rain falls for 42.2 days and collects up to 6.77" (172mm) of precipitation.

What is the month with the least sunshine in Castaic?

With an average of 6.7h of sunshine, February has the least sunshine of the year in Castaic.

What is the month with the lowest UV index in Castaic?

February, November and December, with an average maximum UV index of 3, are months with the lowest UV index in Castaic.

What is the most humid month in Castaic?

The most humid month is March, with an average relative humidity of 56%.

What is the driest month in Castaic?

June and August are months with the least rain in Castaic, California, when the rain falls for 0.7 days and typically aggregates up to 0.04" (1mm) of rain.

When are the longest days in Castaic?

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

What is the month with the most sunshine in Castaic?

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

When is the highest UV index in Castaic?

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

What is the warmest month in Castaic?

With an average high-temperature of 88.2°F (31.2°C) and an average low-temperature of 63.7°F (17.6°C), August is the warmest month in Castaic, California.

What is the least humid month in Castaic?

August and October, with an average relative humidity of 43%, are the least humid months in Castaic.

What is the coldest month in Castaic?

December is the coldest month in Castaic, California, with an average high-temperature of 59.5°F (15.3°C) and an average low-temperature of 42.3°F (5.7°C).

What is the rainiest month in Castaic?

The month with the most rainfall in Castaic, California, is December when the rain falls for 5.3 days and typically aggregates up to 1.42" (36mm) of precipitation.

What is the month with the shortest days in Castaic?

The month with the shortest days in Castaic, California, is December, with an average of 9.9h of daylight.

Average temperature
Castaic, CA

Average temperature - Castaic, CA

The warmest month (with the highest average high temperature) is August (88.2°F).
The month with the lowest average high temperature is December (59.5°F).

The month with the highest average low temperature is August (63.7°F).
The coldest month (with the lowest average low temperature) is December (42.3°F).

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Average pressure
Castaic, CA

Average pressure - Castaic, CA

The month with the highest atmospheric pressure is January (30.11").
The month with the lowest atmospheric pressure is June (29.88").

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Average wind speed
Castaic, CA

Average wind speed - Castaic, CA

The windiest months (with the highest average wind speed) are January and December (7.3mph).
The calmest month (with the lowest average wind speed) is August (4.9mph).

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Average humidity
Castaic, CA

Average humidity - Castaic, CA

The month with the highest relative humidity is March (56%).
Months with the lowest relative humidity are August and October (43%).

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Average rainfall
Castaic, CA

Average rainfall - Castaic, CA

The wettest month (with the highest rainfall) is December (1.42").
The driest months (with the least rainfall) are June and August (0.04").

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Average rainfall days
Castaic, CA

Average rainfall days - Castaic, CA

The month with the highest number of rainy days is March (6.9 days).
The month with the least rainy days is June (0.7 days).

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Average daylight / Average sunshine
Castaic, CA

Average daylight / Average sunshine - Castaic, 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).
The month with the least sunshine is February (Average sunshine: 6.7h).

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Average sunshine days
Castaic, CA

Average sunshine days - Castaic, CA

The month with the most sunshine days is August (28.7 days).
The month with the least sunshine days is February (21.5 days).

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Average UV index
Castaic, CA

Average UV index - Castaic, CA

Months with the highest UV index are June, July and August (UV index 6).
Months with the lowest UV index are February, November and December (UV index 3).

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Average visibility
Castaic, CA

Average visibility - Castaic, 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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