Weather World
Castaic, CA 7-Day Night Weather Forecast
Quick Weather Clicks
Settings
Sun & Moon
Weather Quote O' the Day
Castaic, CA Weather Forecast
Castaic, CA Weather Forecast Date: 504 AM PDT Thu Oct 08 2026
The area/counties/county of: Santa Clarita Valley, including: Lake Castaic, Newhall, Santa Clarita, and Valencia.or toggle through each period.
Today... Sunny. Highs 96 to 100.
Tonight... Clear. Lows in the 60s to around 70.
Friday... Sunny. Highs in the lower 90s. Southwest winds 10 to 20 mph in the afternoon.
Friday Night... Mostly clear. Lows around 60.
Saturday... Low clouds and fog in the morning then mostly cloudy. Highs around 80. South winds 10 to 20 mph in the afternoon.
Saturday Night... Cloudy. Patchy fog after midnight. Lows in the mid to upper 50s.
Sunday... Low clouds and fog in the morning then mostly cloudy. A 50% chance of showers in the afternoon. Highs in the lower to mid 70s.
Sunday Night... A chance of showers in the evening, then showers likely after midnight. Lows around 50. Chance of precipitation 60%.
Columbus Day... Showers likely. Highs in the mid 60s. Chance of precipitation 70%.
Monday Night... Mostly cloudy with a 40% chance of showers. Lows in the mid to upper 40s.
Tuesday... Mostly cloudy with a 40% chance of showers. Highs around 70.
Tuesday Night... Partly cloudy with a 20% chance of showers. Lows in the mid to upper 40s.
POP = Probability of Precipitation
Castaic Radar Loop
Use the map search tool if you want to place a location marker on the radar map...