Castaic (CA) Weather & Climate: Best Time to Visit
Average temperatures, rainfall, sunshine and the best time to visit Castaic.
Climate overview of Castaic
Castaic, California, United States of America, experiences significant temperature variation throughout the year. Summers bring daytime highs of 35°C (95°F) in August, while winters cool to 18°C (64°F) in December.
The city has a relatively dry climate, receiving around 285 mm (11 in) of rainfall per year. It does experience a distinct dry season from April to November. December is the wettest month and June the driest. The most sunshine falls in July, with an average of 12.1 hours of daily sunshine.
Castaic Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in Castaic — and find the best time to visit.
Monthly Temperature in Castaic
Depending on the time of the year, temperatures range from very warm to moderate in Castaic. On average, daytime temperatures range from a very warm 35°C (95°F) in August to a moderate 18°C (64°F) in December.
Nighttime temperatures range from 17°C (63°F) in August to 6°C (43°F) in December.
Check out our detailed temperature page for more information.
Temperature ranges by month
Rainfall in Castaic
Castaic has a relatively dry climate with low precipitation, averaging 285 mm (11 in) of rainfall annually. The seasons in Castaic bring significant changes in precipitation. The wettest month, December, receives moderate rainfall, with an average of 63 mm (2.5 in) of precipitation. This rainfall is distributed across 8 rainy days.
In contrast, the driest month, June, experiences much less rainfall, totaling 0.1 mm (0 in) over 0 rainy days. These distinct seasonal differences provide diverse experiences throughout the year. For more details, please visit our Castaic Precipitation page.
The mean monthly precipitation over the year, including rain, hail, and snow
The average number of days each month with precipitation
Sunshine Hours in Castaic
In Castaic, summer days are longer and more sunny, with daily sunshine hours peaking at 12.1 hours in July. As the darker season arrives, the brightness of the sun becomes less. November sees a soft sun for only 7.2 hours per average day.
Visit our detailed sunshine hours page for more information.
Monthly hours of sunshine
Daily hours of sunshine
Daily percentage of sunshine
Humidity in Castaic by Month
The relative humidity is high throughout the year in Castaic.
The city experiences its highest humidity in May, reaching 73%. In November, the humidity drops to its lowest level at 50%. What does this mean? Read our detailed page on humidity levels for further details.
Relative humidity over the year
Best Time to Visit Castaic
Rainfall during this time ranges from 7 mm (0.3 in) in May to 62 mm (2.4 in) in January. This means you can expect a mix of sunny days and occasional showers. Seeking the perfect travel destination for this year? We've created a tool that suggests locations matching your desired weather. Let our weather planner guide your travel decisions.
Frequently asked questions about the climate in Castaic
What is the best time to visit Castaic?
February, March, April, May, October and November typically offer the most optimal weather in Castaic. In contrast, July and August tend to have less optimal conditions. Castaic has a distinct dry season from April to November.
What temperatures can I expect in Castaic?
Daytime highs range from 18°C (64°F) in December to 35°C (95°F) in August. Nighttime lows range from 6°C (43°F) to 17°C (63°F). Temperatures vary considerably through the year.
How much rain does Castaic get?
Annual rainfall is around 285 mm (11 in). December is the wettest month with 63 mm (2.5 in), while June is the driest with 0.1 mm (0 in).
How sunny is Castaic?
Castaic receives around 3,257 hours of sunshine per year. July is the sunniest month with 364 hours, while November is the cloudiest with just 217 hours. Overall, Castaic enjoys abundant sunshine.
Castaic 3-Day Forecast
Castaic (CA) 3-Day Forecast
Castaic on the map
Castaic is highlighted — select any city to see its climate.
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