Climate and monthly weather forecast
Castaic, CA

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Weather in January

January in Castaic, California, is an enjoyable winter month, with an average temperature fluctuating between 61.2°F (16.2°C) and 43.9°F (6.6°C). As Castaic transitions from December to January, the average high-temperatures adjust to a still refreshing 61.2°F (16.2°C), nearly the same as the previous 59.5°F (15.3°C). Weather in January »

Weather in February

February, the last month of the winter in Castaic, is also an enjoyable month, with temperature in the range of an average low of 42.8°F (6°C) and an average high of 61.3°F (16.3°C). The arrival of February records an average high-temperature of a still refreshing 61.3°F (16.3°C), closely related to the 61.2°F (16.2°C) observed in January. Weather in February »

Weather in March

The first month of the spring, March, is still a refreshing month in Castaic, California, with temperature in the range of an average high of 64.6°F (18.1°C) and an average low of 44.6°F (7°C). In Castaic, March's average high-temperature stands at a still refreshing 64.6°F (18.1°C), closely related to the preceding month. Weather in March »

Weather in April

April is an agreeable spring month in Castaic, California, with temperature in the range of an average low of 47.5°F (8.6°C) and an average high of 69.6°F (20.9°C). Castaic marks the onset of April with an average high-temperature of an agreeable 69.6°F (20.9°C), subtly divergent from March's 64.6°F (18.1°C). Weather in April »

Weather in May

The last month of the spring, May, is a warm month in Castaic, California, with an average temperature fluctuating between 73.9°F (23.3°C) and 51.8°F (11°C). At the start of May, Castaic's average high-temperature reaches a warm 73.9°F (23.3°C), subtly different from the preceding month. Weather in May »

Weather in June

The first month of the summer, June, is still a warm month in Castaic, California, 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). June brings a slight increase in the average high-temperature, progressing 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 in Castaic, California, is a tropical summer month, with an average temperature varying between 63°F (17.2°C) and 87.3°F (30.7°C). Castaic perceives a slight temperature ascent during July, with average high-temperatures adjusting from a warm 81.7°F (27.6°C) in June to a tropical 87.3°F (30.7°C). Weather in July »

Weather in August

August, the last month of the summer in Castaic, is another tropical month, with an average temperature ranging between min 63.7°F (17.6°C) and max 88.2°F (31.2°C). August is the warmest month, with an average high-temperature of 88.2°F (31.2°C) and an average low-temperature of 63.7°F (17.6°C). For August, the heat index is estimated at a tropical 89.6°F (32°C). Weather in August »

Weather in September

The first month of the autumn, September, is also a moderately hot month in Castaic, California, with temperature in the range of an average high of 84.7°F (29.3°C) and an average low of 61°F (16.1°C). September's onset brings an average high-temperature of a moderately hot 84.7°F (29.3°C), showing a minute difference from August's 88.2°F (31.2°C). Weather in September »

Weather in October

October, the same as September, is another warm autumn month in Castaic, California, with an average temperature fluctuating between 76.6°F (24.8°C) and 55.8°F (13.2°C). The average high-temperature slightly decreases in October, shifting from 84.7°F (29.3°C) in September to a still warm 76.6°F (24.8°C). Weather in October »

Weather in November

The last month of the autumn, November, is another pleasant month in Castaic, California, with an average temperature fluctuating between 49.1°F (9.5°C) and 68°F (20°C). With the arrival of November, Castaic experiences a modest decline in average high-temperatures, transitioning from a moderately hot 76.6°F (24.8°C) in October to a pleasant 68°F (20°C). Weather in November »

Weather in December

December, the first month of the winter in Castaic, is still a mild month, with temperature in the range of an average low of 42.3°F (5.7°C) and an average high of 59.5°F (15.3°C). In Castaic, the lowest temperatures are generally noted in December, averaging a high of 59.5°F (15.3°C) and a low of 42.3°F (5.7°C). Weather in December »
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Frequently asked questions

How many days 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, California.

When is the lowest UV index in Castaic?

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

What is the most humid month in Castaic?

With an average relative humidity of 56%, March is the most humid month.

When is Daylight Saving Time (DST) in Castaic?

On Sunday, March 10. 2024, at 2:00 am, Daylight Saving Time starts, 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 driest month in Castaic?

The months with the least rainfall are June and August Rain falls for 0.7 days and accumulates 0.04" (1mm) of rain.

When are the longest days in Castaic?

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

What are the months with the most sunshine in Castaic?

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

What are the months with the highest UV index in Castaic?

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

What month is the hottest in Castaic?

The month of August sees the average highest temperatures in Castaic, California, reaching 88.2°F (31.2°C) at the peak and 63.7°F (17.6°C) at the low.

What are the least humid months in Castaic?

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

What are the coldest months in Castaic?

Castaic's coldest month, December, registers temperatures that range from a high of 59.5°F (15.3°C) to a low of 42.3°F (5.7°C).

What is the rainiest month in Castaic?

December is the month with the most rainfall. Rain falls for 5.3 days and accumulates 1.42" (36mm) of precipitation.

What is the month with the shortest days in Castaic?

The month with the shortest days in Castaic is December, with an average of 9h and 54min 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"Hg).
The month with the lowest atmospheric pressure is June (29.88"Hg).

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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%).
The 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: 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 month with the least sunshine is February (Average sunshine: 6h and 42min).

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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

The months with the highest UV index are June, July and August (UV index 6).
The 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

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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Castaic, California, USA

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