Diablo Grande Weather in January
Average highs run from 59°F on January 1 to 63°F on January 31, and lows from 37°F to 39°F. Normal precipitation for the month is 2.66 in over about 11 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
- 60°F
- Average low
- 38°F
- Precipitation
- 2.66 in
- Record high
- 74°FJan 19, 2021
- Record low
- 18°FJan 2, 1961
- Chance of a freeze
- 87%
- Daylight
- 9 h 38 min to 10 h 20 min
- Cloud cover
- 55%
- Humidity
- 80%
- Dew point
- 40°F
- Wind
- 6.3 mph
Every day of the month
A wet day has at least 0.01 inch of precipitation.
| Date | Normal high | Normal low | Record high | Record low | Chance wet |
|---|---|---|---|---|---|
| Jan 1 | 59°F | 37°F | 65°F 1997 | 21°F 1979 | 35% |
| Jan 2 | 59°F | 37°F | 67°F 2007 | 18°F 1961 | 35% |
| Jan 3 | 59°F | 38°F | 62°F 1996 | 23°F 2011 | 35% |
| Jan 4 | 59°F | 38°F | 65°F 2007 | 21°F 1993 | 35% |
| Jan 5 | 59°F | 38°F | 65°F 2012 | 22°F 1950 | 35% |
| Jan 6 | 59°F | 38°F | 68°F 2012 | 23°F 1950 | 35% |
| Jan 7 | 59°F | 38°F | 66°F 1990 | 24°F 1973 | 35% |
| Jan 8 | 59°F | 38°F | 67°F 1990 | 25°F 1973 | 35% |
| Jan 9 | 59°F | 38°F | 69°F 1953 | 26°F 1977 | 35% |
| Jan 10 | 59°F | 38°F | 70°F 1953 | 25°F 2026 | 35% |
| Jan 11 | 59°F | 38°F | 68°F 1953 | 26°F 2026 | 35% |
| Jan 12 | 59°F | 38°F | 67°F 1959 | 26°F 1963 | 35% |
| Jan 13 | 59°F | 38°F | 70°F 1980 | 24°F 1963 | 35% |
| Jan 14 | 60°F | 38°F | 69°F 2009 | 23°F 1963 | 35% |
| Jan 15 | 60°F | 38°F | 68°F 2021 | 23°F 1963 | 35% |
| Jan 16 | 60°F | 38°F | 68°F 2009 | 20°F 2007 | 35% |
| Jan 17 | 60°F | 38°F | 70°F 1998 | 26°F 1960 | 35% |
| Jan 18 | 60°F | 38°F | 67°F 1981 | 26°F 2001 | 35% |
| Jan 19 | 60°F | 38°F | 74°F 2021 | 26°F 1987 | 35% |
| Jan 20 | 60°F | 38°F | 68°F 1981 | 19°F 1963 | 35% |
| Jan 21 | 61°F | 39°F | 69°F 1986 | 23°F 2025 | 35% |
| Jan 22 | 61°F | 39°F | 70°F 1950 | 24°F 1962 | 35% |
| Jan 23 | 61°F | 39°F | 69°F 1950 | 24°F 2025 | 35% |
| Jan 24 | 61°F | 39°F | 68°F 1970 | 22°F 1962 | 35% |
| Jan 25 | 61°F | 39°F | 69°F 1976 | 25°F 1962 | 35% |
| Jan 26 | 62°F | 39°F | 67°F 2017 | 26°F 1950 | 35% |
| Jan 27 | 62°F | 39°F | 72°F 2014 | 27°F 1979 | 35% |
| Jan 28 | 62°F | 39°F | 67°F 2014 | 25°F 2021 | 34% |
| Jan 29 | 62°F | 39°F | 70°F 2014 | 27°F 1979 | 34% |
| Jan 30 | 62°F | 39°F | 69°F 2014 | 27°F 1991 | 34% |
| Jan 31 | 63°F | 39°F | 74°F 1976 | 23°F 2008 | 34% |
Chance of rain
- Chance of a wet day
Sunrise and sunset
Times for 2026, local time (PST).
- January 1
- sunrise 7:20 AM, sunset 4:58 PM
- January 31
- sunrise 7:09 AM, sunset 5:29 PM
Other months
Sources
Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00046168 (Newman), public domain. Records: NOAA GHCN-Daily, station USC00048999, 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.