Castaic Weather in August
Average highs run from 96°F on August 1 to 95°F on August 31, and lows from 64°F to 64°F. Normal precipitation for the month is 0.00 in over about 0 wet days.
August day by day
The normal high and low for each date, and the record, in °F.
- Normal low
- Normal high
- Record high
- Record low
August at a glance
- Average high
- 96°F
- Average low
- 64°F
- Precipitation
- 0.00 in
- Record high
- 104°FAug 28, 2017
- Record low
- 40°FAug 14, 1968
- Chance of a freeze
- 0%
- Days of 90°F or more
- 23.9
- Daylight
- 13 h 51 min to 12 h 55 min
- Cloud cover
- 14%
- Humidity
- 32%
- Dew point
- 42°F
- Wind
- 5.8 mph
Every day of the month
A wet day has at least 0.01 inch of precipitation; snow means at least 0.1 inch of snowfall.
| Date | Normal high | Normal low | Record high | Record low | Chance wet | Chance of snow |
|---|---|---|---|---|---|---|
| Aug 1 | 96°F | 64°F | 101°F 1993 | 50°F 1976 | 1% | 0% |
| Aug 2 | 96°F | 64°F | 98°F 1993 | 50°F 1976 | 1% | 0% |
| Aug 3 | 96°F | 64°F | 98°F 2021 | 48°F 1953 | 1% | 0% |
| Aug 4 | 96°F | 64°F | 100°F 1998 | 47°F 1976 | 1% | 0% |
| Aug 5 | 96°F | 64°F | 99°F 1998 | 49°F 1950 | 1% | 0% |
| Aug 6 | 96°F | 64°F | 100°F 1997 | 47°F 1999 | 1% | 0% |
| Aug 7 | 96°F | 64°F | 98°F 2018 | 47°F 1999 | 1% | 0% |
| Aug 8 | 96°F | 64°F | 100°F 1981 | 50°F 1949 | 1% | 0% |
| Aug 9 | 96°F | 64°F | 98°F 2012 | 46°F 1949 | 1% | 0% |
| Aug 10 | 96°F | 64°F | 99°F 2012 | 45°F 1949 | 1% | 0% |
| Aug 11 | 96°F | 64°F | 98°F 1994 | 48°F 1949 | 1% | 0% |
| Aug 12 | 96°F | 64°F | 98°F 2012 | 51°F 1949 | 1% | 0% |
| Aug 13 | 96°F | 64°F | 100°F 2016 | 46°F 1954 | 1% | 0% |
| Aug 14 | 96°F | 64°F | 99°F 2016 | 40°F 1968 | 1% | 0% |
| Aug 15 | 96°F | 64°F | 103°F 2021 | 45°F 1938 | 1% | 0% |
| Aug 16 | 96°F | 64°F | 99°F 2015 | 44°F 1976 | 1% | 0% |
| Aug 17 | 96°F | 64°F | 101°F 2020 | 44°F 1968 | 1% | 0% |
| Aug 18 | 96°F | 64°F | 101°F 2020 | 45°F 1976 | 1% | 0% |
| Aug 19 | 96°F | 64°F | 98°F 1950 | 46°F 1972 | 1% | 0% |
| Aug 20 | 96°F | 64°F | 96°F 1950 | 43°F 1959 | 1% | 0% |
| Aug 21 | 96°F | 64°F | 97°F 2020 | 41°F 1968 | 1% | 0% |
| Aug 22 | 96°F | 64°F | 95°F 2025 | 40°F 1968 | 1% | 0% |
| Aug 23 | 96°F | 64°F | 98°F 2022 | 44°F 1963 | 1% | 0% |
| Aug 24 | 96°F | 64°F | 97°F 1985 | 45°F 1973 | 1% | 0% |
| Aug 25 | 96°F | 64°F | 96°F 2010 | 45°F 1972 | 1% | 0% |
| Aug 26 | 96°F | 64°F | 97°F 2017 | 42°F 1954 | 1% | 0% |
| Aug 27 | 96°F | 64°F | 101°F 2017 | 45°F 1973 | 1% | 0% |
| Aug 28 | 96°F | 64°F | 104°F 2017 | 45°F 1947 | 1% | 0% |
| Aug 29 | 96°F | 64°F | 103°F 2017 | 42°F 1942 | 1% | 0% |
| Aug 30 | 95°F | 64°F | 103°F 2017 | 42°F 1957 | 1% | 0% |
| Aug 31 | 95°F | 64°F | 100°F 2022 | 44°F 1964 | 2% | 0% |
Chance of rain
- Chance of a wet day
- Chance of snowfall
Sunrise and sunset
Times for 2026, local time (PDT).
- August 1
- sunrise 6:05 AM, sunset 7:56 PM
- August 31
- sunrise 6:27 AM, sunset 7:22 PM
Other months
Sources
Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00046161 (Newhall 5NW), public domain. Records: NOAA GHCN-Daily, station USW00023187, every year on file, quality-flagged values removed. Cloud, humidity, wind and sunshine: NASA POWER (MERRA-2, CERES and GEWEX SRB), 1991-2020. The data was obtained from the National Aeronautics and Space Administration (NASA) Langley Research Center's Prediction Of Worldwide Energy Resources (POWER) project funded through the NASA Earth Science Division: POWER Daily API v2, accessed 2026-09-24. Sun and moon: computed with the NOAA solar equations and Meeus.