Weather forecast for 10 daysCastaic, CA

Weather forecast for the weekend

Saturday Oct 17, 2026

  • 86°F
  • 59°F
Partly Cloudy / Wind
Partly Cloudy / Wind
  • Precip. probability: 3%
  • Precipitation: 0"
  • Wind: 25mphENE 61°
  • Humidity: 16%
  • UV index: 6
  • Sunrise: 7:01 am PDT
  • Sunset: 6:17 pm PDT
  • ▼
On Saturday, October 17, breezy and partly cloudy conditions will persist throughout the day.
A stark contrast will be evident between the daytime peak temperature of a humid 86°F and the nighttime low of a mild 59°F.
Today, expect conditions that are hotter than normal, with a temperature that reflects September's typical maximum of 84.7°F.
Sunrise was at 7:01 am and sunset will be at 6:17 pm; the daylight will last for 11h and 16min.

Sunday Oct 18, 2026

  • 86°F
  • 57°F
Sunny
Sunny
  • Precip. probability: 0%
  • Precipitation: 0"
  • Wind: 14mphENE 70°
  • Humidity: 25%
  • UV index: 6
  • Sunrise: 7:02 am PDT
  • Sunset: 6:16 pm PDT
  • ▼
Tomorrow, in Castaic, skies will stay clear and sunny.
A substantial temperature fluctuation from a humid 86°F at its peak to a refreshing 57.2°F at its lowest point is predicted.
Tomorrow, the maximum temperature of 86°F will resemble September's climate more than October's.
Sunrise will be at 7:02 am and sunset at 6:16 pm; tomorrow's daylight will last for 11h and 14min.

10-day overview

Daily temperatures

Warmest period: today - tomorrow 86°C.
Coldest day: Thursday 63°C.

Chance of precipitation

Highest chance: Wednesday 70%.

Long-term weather forecast

  • Saturday
  • Oct 17, 2026
  • 86°F
  • 59°F
Partly Cloudy / Wind
Partly Cloudy / Wind
  • Precip. probability: 3%
  • Precipitation: 0"
  • Wind: 25mphENE 61°
  • Humidity: 16%
  • UV index: 6
  • Sunrise: 7:01 am PDT
  • Sunset: 6:17 pm PDT
  • ▼
  • Sunday
  • Oct 18, 2026
  • 86°F
  • 57°F
Sunny
Sunny
  • Precip. probability: 0%
  • Precipitation: 0"
  • Wind: 14mphENE 70°
  • Humidity: 25%
  • UV index: 6
  • Sunrise: 7:02 am PDT
  • Sunset: 6:16 pm PDT
  • ▼
  • Monday
  • Oct 19, 2026
  • 82°F
  • 55°F
Sunny
Sunny
  • Precip. probability: 0%
  • Precipitation: 0"
  • Wind: 16mphS 178°
  • Humidity: 32%
  • UV index: 6
  • Sunrise: 7:03 am PDT
  • Sunset: 6:15 pm PDT
  • ▼
  • Tuesday
  • Oct 20, 2026
  • 77°F
  • 57°F
Mostly Sunny
Mostly Sunny
  • Precip. probability: 6%
  • Precipitation: 0"
  • Wind: 13mphSSE 150°
  • Humidity: 44%
  • UV index: 6
  • Sunrise: 7:04 am PDT
  • Sunset: 6:14 pm PDT
  • ▼
  • Wednesday
  • Oct 21, 2026
  • 68°F
  • 55°F
Rain
Rain
  • Precip. probability: 70%
  • Precipitation: 0.63"
  • Wind: 11mphSE 129°
  • Humidity: 62%
  • UV index: 4
  • Sunrise: 7:05 am PDT
  • Sunset: 6:12 pm PDT
  • ▼
  • Thursday
  • Oct 22, 2026
  • 63°F
  • 52°F
Thunderstorms
Thunderstorms
  • Precip. probability: 67%
  • Precipitation: 0.24"
  • Wind: 11mphSE 141°
  • Humidity: 77%
  • UV index: 4
  • Sunrise: 7:06 am PDT
  • Sunset: 6:11 pm PDT
  • ▼
  • Friday
  • Oct 23, 2026
  • 70°F
  • 52°F
Sunny
Sunny
  • Precip. probability: 6%
  • Precipitation: 0"
  • Wind: 10mphESE 119°
  • Humidity: 61%
  • UV index: 5
  • Sunrise: 7:07 am PDT
  • Sunset: 6:10 pm PDT
  • ▼
  • Saturday
  • Oct 24, 2026
  • 75°F
  • 55°F
Mostly Sunny
Mostly Sunny
  • Precip. probability: 3%
  • Precipitation: 0"
  • Wind: 11mphE 91°
  • Humidity: 49%
  • UV index: 5
  • Sunrise: 7:07 am PDT
  • Sunset: 6:09 pm PDT
  • ▼
  • Sunday
  • Oct 25, 2026
  • 75°F
  • 54°F
Partly Cloudy
Partly Cloudy
  • Precip. probability: 8%
  • Precipitation: 0.08"
  • Wind: 12mphE 98°
  • Humidity: 46%
  • UV index: 5
  • Sunrise: 7:08 am PDT
  • Sunset: 6:08 pm PDT
  • ▼
  • Monday
  • Oct 26, 2026
  • 72°F
  • 52°F
Mostly Sunny
Mostly Sunny
  • Precip. probability: 22%
  • Precipitation: 0"
  • Wind: 12mphE 94°
  • Humidity: 49%
  • UV index: 5
  • Sunrise: 7:09 am PDT
  • Sunset: 6:07 pm PDT
  • ▼
An unsettled pattern is expected over the next ten days, and a mix of mostly clear, gloomy, rain-soaked and lightning-active weather is predicted.
Rainfall is anticipated on Wednesday and Thursday.
Noticeable swings in temperature are expected in the upcoming period. Maximum temperatures are forecasted between 62.6°F and 86°F, while nighttime temperatures are expected to vary from 51.8°F to 59°F.
Saturday and Sunday, with the highest temperature of 86°F, will be the hottest days in Castaic; expect the coldest day on Thursday with a high of 62.6°F.
Updated: Oct 17, 2026 @ 17:00:53 UTC
Published by: Weather U.S. | About Us
Data Sources | weather.com | Weather
Weather Forecasting & Climate

Frequently asked questions

Today, partly cloudy skies with gusty winds are expected.

Today, the highest temperature will be 86°F, while the lowest temperature will be 59°F.
The highest temperature will be noticeably higher than the average maximum of 76.6°F in October. The lowest temperature will be in line with the average low of 55.8°F.

On Saturday, in Castaic, sunrise was at 7:01 am and sunset will be at 6:17 pm (PDT).

Today in Castaic, the daylight will last for 11h and 16min.

On Sunday, sunny and dry conditions are anticipated.

Tomorrow, the highest temperature will be 86°F, while the lowest temperature will be 57.2°F.
The highest temperature tomorrow will be uncommonly higher than the average maximum of 76.6°F in October. The lowest temperature will be in line with the average low of 55.8°F.

On Sunday, in Castaic, sunrise will be at 7:02 am and sunset at 6:16 pm (PDT).

In Castaic, tomorrow, there will be 11h and 14min of daylight.