Castaic Weather in January
Average highs run from 63°F on January 1 to 63°F on January 31, and lows from 46°F to 45°F. Normal precipitation for the month is 4.23 in over about 5 wet days.
January day by day
The normal high and low for each date, and the record, in °F.
- Normal low
- Normal high
- Record high
- Record low
January at a glance
- Average high
- 63°F
- Average low
- 47°F
- Precipitation
- 4.23 in
- Snowfall
- 0.1 in
- Record high
- 82°FJan 31, 2018
- Record low
- 3°FJan 21, 1937
- Chance of a freeze
- 16%
- Daylight
- 9 h 54 min to 10 h 30 min
- Cloud cover
- 47%
- Humidity
- 64%
- Dew point
- 33°F
- Wind
- 8.7 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 |
|---|---|---|---|---|---|---|
| Jan 1 | 63°F | 46°F | 71°F 1964 | 17°F 1965 | 15% | 0% |
| Jan 2 | 63°F | 47°F | 65°F 2018 | 15°F 1974 | 15% | 0% |
| Jan 3 | 63°F | 47°F | 68°F 2012 | 13°F 1949 | 15% | 0% |
| Jan 4 | 63°F | 47°F | 67°F 2018 | 8°F 1949 | 15% | 0% |
| Jan 5 | 63°F | 47°F | 68°F 2012 | 15°F 1971 | 15% | 0% |
| Jan 6 | 63°F | 47°F | 71°F 1969 | 16°F 1971 | 15% | 0% |
| Jan 7 | 63°F | 47°F | 69°F 1948 | 15°F 1937 | 15% | 0% |
| Jan 8 | 63°F | 47°F | 68°F 2015 | 9°F 1937 | 15% | 0% |
| Jan 9 | 63°F | 47°F | 66°F 1948 | 8°F 1937 | 15% | 0% |
| Jan 10 | 63°F | 47°F | 64°F 1990 | 12°F 1949 | 15% | 0% |
| Jan 11 | 63°F | 47°F | 67°F 2014 | 12°F 1949 | 15% | 0% |
| Jan 12 | 63°F | 47°F | 67°F 2002 | 11°F 1963 | 15% | 0% |
| Jan 13 | 63°F | 47°F | 68°F 1996 | 12°F 1963 | 15% | 0% |
| Jan 14 | 63°F | 47°F | 69°F 1996 | 15°F 2013 | 15% | 0% |
| Jan 15 | 63°F | 47°F | 71°F 1943 | 20°F 1987 | 15% | 0% |
| Jan 16 | 63°F | 47°F | 70°F 2021 | 16°F 1987 | 15% | 0% |
| Jan 17 | 63°F | 47°F | 69°F 2018 | 17°F 1949 | 15% | 0% |
| Jan 18 | 63°F | 47°F | 71°F 2015 | 18°F 1943 | 15% | 0% |
| Jan 19 | 63°F | 47°F | 68°F 1971 | 13°F 1935 | 15% | 0% |
| Jan 20 | 63°F | 47°F | 65°F 1971 | 10°F 1937 | 16% | 0% |
| Jan 21 | 63°F | 47°F | 63°F 1975 | 3°F 1937 | 16% | 0% |
| Jan 22 | 63°F | 47°F | 70°F 2014 | 12°F 1937 | 16% | 0% |
| Jan 23 | 63°F | 46°F | 67°F 1948 | 9°F 1937 | 16% | 0% |
| Jan 24 | 63°F | 46°F | 69°F 1948 | 18°F 1949 | 17% | 0% |
| Jan 25 | 63°F | 46°F | 67°F 1975 | 18°F 1949 | 17% | 0% |
| Jan 26 | 63°F | 46°F | 67°F 1951 | 21°F 1949 | 17% | 0% |
| Jan 27 | 63°F | 46°F | 67°F 2019 | 18°F 1957 | 17% | 0% |
| Jan 28 | 63°F | 46°F | 65°F 1993 | 14°F 1957 | 18% | 0% |
| Jan 29 | 63°F | 45°F | 67°F 2014 | 17°F 1969 | 18% | 0% |
| Jan 30 | 63°F | 45°F | 67°F 2018 | 20°F 2002 | 18% | 0% |
| Jan 31 | 63°F | 45°F | 82°F 2018 | 20°F 1937 | 18% | 0% |
Chance of rain
- Chance of a wet day
- Chance of snowfall
Sunrise and sunset
Times for 2026, local time (PST).
- January 1
- sunrise 7:01 AM, sunset 4:55 PM
- January 31
- sunrise 6:53 AM, sunset 5:23 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.