Rialto Weather in January
Average highs run from 69°F on January 1 to 70°F on January 31, and lows from 44°F to 44°F. Normal precipitation for the month is 2.11 in over about 7 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
- 70°F
- Average low
- 44°F
- Precipitation
- 2.11 in
- Record high
- 93°FJan 9, 1990
- Record low
- 18°FJan 7, 1913
- Chance of a freeze
- 25%
- Daylight
- 9 h 56 min to 10 h 32 min
- Cloud cover
- 46%
- Humidity
- 57%
- Dew point
- 33°F
- Wind
- 6.9 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 | 69°F | 44°F | 85°F 1918 | 25°F 1983 | 21% |
| Jan 2 | 69°F | 44°F | 86°F 2012 | 25°F 1919 | 21% |
| Jan 3 | 69°F | 44°F | 86°F 2012 | 24°F 1924 | 22% |
| Jan 4 | 69°F | 44°F | 85°F 2012 | 22°F 1949 | 22% |
| Jan 5 | 69°F | 44°F | 85°F 1903 | 24°F 1949 | 22% |
| Jan 6 | 69°F | 44°F | 84°F 1969 | 22°F 1913 | 22% |
| Jan 7 | 69°F | 44°F | 87°F 1962 | 18°F 1913 | 22% |
| Jan 8 | 69°F | 44°F | 89°F 1923 | 24°F 1913 | 22% |
| Jan 9 | 69°F | 44°F | 93°F 1990 | 22°F 1937 | 22% |
| Jan 10 | 69°F | 44°F | 84°F 1923 | 24°F 1937 | 22% |
| Jan 11 | 69°F | 44°F | 84°F 1986 | 25°F 1937 | 22% |
| Jan 12 | 70°F | 44°F | 86°F 1928 | 26°F 1949 | 22% |
| Jan 13 | 70°F | 44°F | 82°F 1986 | 24°F 1963 | 22% |
| Jan 14 | 70°F | 44°F | 87°F 2009 | 24°F 2007 | 22% |
| Jan 15 | 70°F | 44°F | 83°F 1975 | 27°F 2007 | 22% |
| Jan 16 | 70°F | 44°F | 86°F 1976 | 27°F 2007 | 22% |
| Jan 17 | 70°F | 44°F | 87°F 1971 | 28°F 1960 | 22% |
| Jan 18 | 70°F | 44°F | 91°F 1971 | 27°F 1928 | 22% |
| Jan 19 | 70°F | 44°F | 89°F 1971 | 28°F 1910 | 21% |
| Jan 20 | 70°F | 44°F | 80°F 1968 | 20°F 1922 | 21% |
| Jan 21 | 70°F | 44°F | 80°F 1968 | 23°F 1922 | 22% |
| Jan 22 | 70°F | 44°F | 84°F 1994 | 20°F 1937 | 22% |
| Jan 23 | 70°F | 44°F | 85°F 1948 | 20°F 1937 | 22% |
| Jan 24 | 70°F | 44°F | 82°F 1946 | 24°F 1937 | 22% |
| Jan 25 | 70°F | 44°F | 86°F 2003 | 27°F 1932 | 22% |
| Jan 26 | 70°F | 44°F | 86°F 1987 | 26°F 1950 | 22% |
| Jan 27 | 70°F | 44°F | 86°F 1986 | 28°F 1950 | 22% |
| Jan 28 | 70°F | 44°F | 83°F 1971 | 22°F 1937 | 22% |
| Jan 29 | 70°F | 44°F | 85°F 1971 | 27°F 1932 | 22% |
| Jan 30 | 70°F | 44°F | 87°F 2003 | 28°F 1949 | 22% |
| Jan 31 | 70°F | 44°F | 93°F 2003 | 25°F 1982 | 22% |
Chance of rain
- Chance of a wet day
Sunrise and sunset
Times for 2026, local time (PST).
- January 1
- sunrise 6:55 AM, sunset 4:51 PM
- January 31
- sunrise 6:47 AM, sunset 5:19 PM
Other months
Sources
Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00047473 (Riverside Citrus Exp), public domain. Records: NOAA GHCN-Daily, station USC00047306, 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.