Hillsboro, OR weather in January
Expect chilly weather with rain on most days in Hillsboro in January, with highs near 45°F and lows near 33°F. Rain or snow falls on about 20 days. Snowfall averages about 1.6 in. It is one of the coldest months in Hillsboro. Pack rain gear.
- Normal high
- 45°F
- Normal low
- 33°F
- Wet days
- 20
- 7.2 in total
- Snowfall
- 1.6 in
- normal snowfall
How January changes from start to finish
| January 1 | January 31 | |
|---|---|---|
| Normal high | 43°F | 47°F |
| Normal low | 32°F | 33°F |
| Chance of a wet day | 67% | 59% |
| Sunrise / sunset | 7:52 am / 4:38 pm | 7:34 am / 5:16 pm |
| Daylight | 8.8 h | 9.7 h |
Chance of a wet day: average for the first and last 7 days of the month. Times are local clock time (Pacific Time).
A typical January day
- 6 am37°Fdew point 35°F
- 9 am38°Fdew point 36°F
- Noon43°Fdew point 38°F
- 3 pm45°Fdew point 38°F
- 6 pm42°Fdew point 37°F
- 9 pm40°Fdew point 36°F
NOAA hourly normals (local standard time) from Portland-Hillsboro Airport (2 mi away); average wind 5 mph.
What kind of days to expect
- Comfortable dayshigh 65-80°F and dew point under 60°F0 of 31
- Hot dayshigh 90°F or more0 of 31
- Muggy daysdaily mean dew point 65°F or more0 of 31
- Wet daysat least 0.01 in of rain or melted snow20 of 31
- Notable rainat least 0.10 in14 of 31
- Freezing nightslow 32°F or below13 of 31
- Snow on the groundsnow depth 1 in or more0 of 31
Average days per January, counted from daily records for each year 1991-2020.
Rain and snow in January
Normal precipitation is 7.2 in; a dry January brings about 4.5 in and a wet one about 9.5 in (25th and 75th percentiles). About 5 days bring half an inch or more, and about 1 an inch or more. Normal snowfall is 1.6 in, with about 1 day of an inch or more.
How January varies from year to year
- Warmest January, 1991-20202003: average high 52°F
- Coolest January2017: average high 40°F
- Wettest January2006: 14.1 in
- Driest January2001: 2.2 in
- Highest reading67°F (January 19, 2005)
- Lowest reading8°F (January 11, 1993)
From the station's daily records with NOAA quality flags removed; most recent date shown when a reading repeats.
January compared with December and February
| December | January | February | |
|---|---|---|---|
| Normal high | 44°F | 45°F | 49°F |
| Normal low | 33°F | 33°F | 33°F |
| Wet days | 21 | 20 | 15 |
| Comfortable days | 0 | 0 | 1 |
| Daylight | 8.8 h | 9.2 h | 10.4 h |
Highs change by +1°F from December and +4°F into February.
Nearby alternatives in January
- Drier: Bend, OR130 mi · high 43°F · 9 wet days
- Cooler: Leavenworth, WA181 mi · high 34°F · 14 wet days
How Hillsboro ranks in January
- Normal high218th warmest of 378 cities; 5th of 6 in Oregon
- Wet days373rd driest of 378
- Comfortable days319th most of 339
What to pack for Hillsboro in January
- A warm jacket – lows near 33°F, highs near 45°F
- A rain jacket or umbrella – rain or snow on about 20 days
Heating and cooling
January has 812 heating degree days and 0 cooling degree days (base 65°F), 15% of the year's total heating and cooling demand.
Questions
How cold is Hillsboro in January?
The normal high is 45°F and the normal low is 33°F. From 1991 to 2020 the coldest January reading was 8°F (January 11, 1993).
Does it rain a lot in Hillsboro in January?
About 20 days in January have at least 0.01 in of precipitation, and the normal total is 7.2 in. The wettest January in 1991-2020 was in 2006 (14.1 in); the driest was in 2001 (2.2 in).
Does it snow in Hillsboro in January?
Yes. Normal snowfall in January is 1.6 in.
Is January a good time to visit Hillsboro?
January ranks 11th of 12 months on our comfort score for Hillsboro (31 out of 100). It has almost no comfortable days. The best month is June.
Where the numbers come from
- Temperature and snow depth: Forest Grove (USC00352997), 5.5 mi W of the city center, 180 ft . NOAA normals and daily records, 1991-2020.
- Rain and snowfall: Dilley 2 S (USC00352325), 7.3 mi SW of the city center, 194 ft . NOAA normals and daily records, 1991-2020.
- Frost dates and humidity and wind by hour: Portland-Hillsboro Airport (USW00094261), 2.3 mi ENE of the city center, 204 ft . NOAA normals and daily records, 1991-2020.
- Daily humidity and wind: Portland International Airport (726980-24229), 19 mi ENE of the city center, 22 ft (173 ft lower than the city). Hourly observations, 1991-2020.
- Not available for this location: cloud cover (no station close enough or similar enough in elevation).