Union Weather in January
Average highs run from 44°F on January 1 to 47°F on January 31, and lows from 35°F to 35°F. Normal precipitation for the month is 15.48 in over about 20 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
- 45°F
- Average low
- 36°F
- Precipitation
- 15.48 in
- Snowfall
- 1.3 in
- Record high
- 61°FJan 19, 2005
- Record low
- 8°FJan 4, 2004
- Chance of a freeze
- 93%
- Daylight
- 8 h 33 min to 9 h 34 min
- Cloud cover
- 76%
- Humidity
- 94%
- Dew point
- 33°F
- Wind
- 4.3 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 | 44°F | 35°F | 52°F 2012 | 12°F 2022 | 67% | 2% |
| Jan 2 | 44°F | 35°F | 54°F 2001 | 15°F 2016 | 67% | 2% |
| Jan 3 | 44°F | 36°F | 52°F 2026 | 17°F 2011 | 67% | 2% |
| Jan 4 | 44°F | 36°F | 53°F 2003 | 8°F 2004 | 67% | 2% |
| Jan 5 | 44°F | 36°F | 55°F 2015 | 12°F 2017 | 67% | 2% |
| Jan 6 | 44°F | 36°F | 52°F 2006 | 13°F 2017 | 66% | 2% |
| Jan 7 | 45°F | 36°F | 57°F 2002 | 15°F 2017 | 66% | 2% |
| Jan 8 | 45°F | 36°F | 51°F 2012 | 27°F 2001 | 66% | 2% |
| Jan 9 | 45°F | 36°F | 54°F 2003 | 25°F 2022 | 66% | 2% |
| Jan 10 | 45°F | 36°F | 54°F 2006 | 25°F 2022 | 66% | 2% |
| Jan 11 | 45°F | 36°F | 57°F 2010 | 15°F 2007 | 66% | 2% |
| Jan 12 | 45°F | 36°F | 56°F 2021 | 13°F 2007 | 66% | 2% |
| Jan 13 | 45°F | 36°F | 53°F 2010 | 17°F 2024 | 65% | 2% |
| Jan 14 | 45°F | 36°F | 57°F 2023 | 10°F 2024 | 65% | 2% |
| Jan 15 | 45°F | 36°F | 58°F 2018 | 13°F 2024 | 65% | 2% |
| Jan 16 | 45°F | 36°F | 55°F 2018 | 15°F 2024 | 65% | 1% |
| Jan 17 | 45°F | 36°F | 56°F 2005 | 21°F 2013 | 65% | 1% |
| Jan 18 | 46°F | 36°F | 57°F 2005 | 24°F 2000 | 65% | 1% |
| Jan 19 | 46°F | 36°F | 61°F 2005 | 21°F 2025 | 64% | 1% |
| Jan 20 | 46°F | 36°F | 55°F 2005 | 18°F 2025 | 64% | 1% |
| Jan 21 | 46°F | 36°F | 59°F 2005 | 19°F 2025 | 64% | 1% |
| Jan 22 | 46°F | 36°F | 54°F 2016 | 18°F 2008 | 64% | 1% |
| Jan 23 | 46°F | 36°F | 57°F 2005 | 17°F 2008 | 64% | 1% |
| Jan 24 | 46°F | 36°F | 57°F 2005 | 17°F 2008 | 64% | 1% |
| Jan 25 | 46°F | 36°F | 57°F 2003 | 15°F 2008 | 63% | 1% |
| Jan 26 | 46°F | 36°F | 61°F 2015 | 18°F 2025 | 63% | 2% |
| Jan 27 | 46°F | 36°F | 56°F 2016 | 20°F 2025 | 63% | 2% |
| Jan 28 | 46°F | 36°F | 57°F 2024 | 20°F 2025 | 63% | 2% |
| Jan 29 | 46°F | 36°F | 56°F 2019 | 19°F 2025 | 62% | 2% |
| Jan 30 | 46°F | 36°F | 60°F 2024 | 17°F 2023 | 62% | 2% |
| Jan 31 | 47°F | 35°F | 57°F 2026 | 24°F 2007 | 62% | 2% |
Chance of rain
- Chance of a wet day
- Chance of snowfall
Sunrise and sunset
Times for 2026, local time (PST).
- January 1
- sunrise 8:00 AM, sunset 4:33 PM
- January 31
- sunrise 7:39 AM, sunset 5:13 PM
Other months
Sources
Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00451939 (Cushman Powerhouse #2), public domain. Records: NOAA GHCN-Daily, station USW00094227, 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.