Portland weather in January: Portland, Oregon: normal highs, lows, rain and records for January
Portland in January has a normal high of 48°F and a normal low of 36°F, a daily mean of 42°F, rising from 46°F on the 1st to 49°F by the 31st. Measurable precipitation falls on 19 days in a normal January, 5.03 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 9°C and low of 2°C, 128 mm of precipitation and 4 cm of snow in January.
- NOAA stationPortland International Airport
- Station IDUSW00024229
- Location45.59°N 122.60°W
- Elevation19 ft (6 m)
- From the center4 miles
- Population635,749
- Jan 48° 36°
- Feb 52° 37°
- Mar 57° 40°
- Apr 62° 44°
- May 69° 49°
- Jun 74° 54°
- Jul 82° 59°
- Aug 82° 59°
- Sep 77° 54°
- Oct 64° 47°
- Nov 54° 41°
- Dec 47° 36°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
How warm is Portland in January?
The normal high is 48°F and the normal low 36°F, for a daily mean of 41.9°F. January is 0.3°F warmer than December and 2.2°F cooler than February. January is the 11th warmest month of the year in Portland and the 3rd wettest, and the snowiest. Across the month the normal high rises 3°F, from 46°F on January 1 to 49°F on January 31. From one year to the next January's mean temperature typically moves about 2.8°F either way (NOAA's standard deviation), so roughly two Januarys in three average between 39°F and 45°F.
Bars above: each day's normal high to low. Columns below: the chance of 0.01 inch or more of precipitation that day, on a scale of 0 to 100% (highest 62%).
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in |
|---|---|---|---|---|
| January 1 | 46°F | 36°F | 62% | 42% |
| January 8 | 47°F | 36°F | 62% | 41% |
| January 15 | 47°F | 36°F | 60% | 39% |
| January 22 | 48°F | 36°F | 58% | 37% |
| January 31 | 49°F | 37°F | 57% | 35% |
Every day of January: normal high, low and chance of precipitation (warmest afternoon January 31, coldest night January 1)
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in | Daylight |
|---|---|---|---|---|---|
| January 1 | 46°F | 36°F | 62% | 42% | 8 h 50 min |
| January 2 | 46°F | 36°F | 62% | 42% | 8 h 50 min |
| January 3 | 46°F | 36°F | 62% | 42% | 8 h 50 min |
| January 4 | 46°F | 36°F | 62% | 42% | 8 h 50 min |
| January 5 | 46°F | 36°F | 62% | 41% | 8 h 50 min |
| January 6 | 46°F | 36°F | 62% | 41% | 8 h 50 min |
| January 7 | 47°F | 36°F | 62% | 41% | 8 h 50 min |
| January 8 | 47°F | 36°F | 62% | 41% | 8 h 50 min |
| January 9 | 47°F | 36°F | 61% | 41% | 8 h 50 min |
| January 10 | 47°F | 36°F | 61% | 41% | 9 h |
| January 11 | 47°F | 36°F | 61% | 40% | 9 h |
| January 12 | 47°F | 36°F | 61% | 40% | 9 h |
| January 13 | 47°F | 36°F | 60% | 40% | 9 h |
| January 14 | 47°F | 36°F | 60% | 40% | 9 h |
| January 15 | 47°F | 36°F | 60% | 39% | 9 h |
| January 16 | 47°F | 36°F | 60% | 39% | 9 h 10 min |
| January 17 | 48°F | 36°F | 59% | 39% | 9 h 10 min |
| January 18 | 48°F | 36°F | 59% | 38% | 9 h 10 min |
| January 19 | 48°F | 36°F | 59% | 38% | 9 h 10 min |
| January 20 | 48°F | 36°F | 59% | 38% | 9 h 10 min |
| January 21 | 48°F | 36°F | 58% | 38% | 9 h 20 min |
| January 22 | 48°F | 36°F | 58% | 37% | 9 h 20 min |
| January 23 | 48°F | 36°F | 58% | 37% | 9 h 20 min |
| January 24 | 48°F | 37°F | 58% | 37% | 9 h 20 min |
| January 25 | 49°F | 37°F | 58% | 36% | 9 h 20 min |
| January 26 | 49°F | 37°F | 57% | 36% | 9 h 30 min |
| January 27 | 49°F | 37°F | 57% | 36% | 9 h 30 min |
| January 28 | 49°F | 37°F | 57% | 36% | 9 h 30 min |
| January 29 | 49°F | 37°F | 57% | 35% | 9 h 30 min |
| January 30 | 49°F | 37°F | 57% | 35% | 9 h 40 min |
| January 31 | 49°F | 37°F | 57% | 35% | 9 h 40 min |
- Normal high
- 48°FJanuary average
- Normal low
- 36°FJanuary average
- Precipitation
- 5.03 inmonth total
- Days with precipitation
- 190.01 inch or more
- Snowfall
- 1.7 inmonth total
- Nights at 32°F or colder
- 9
- Daylight
- 8 h 50 min to 9 h 40 minJanuary 1 to January 31
- Sunshine
- 54%of clear-sky sunlight (NASA)
Source: NOAA NCEI 1991-2020 daily normals, station USW00024229; monthly normals. Daylight is computed from the place's latitude with NOAA's solar equations.
Does it rain or snow in Portland in January?
On a given January day the chance of 0.01 inch or more is 60% on average, highest around January 1 (62%). In all, 5.03 in falls on 19 days of a normal January, 1 of them with an inch or more.
In a normal January in Portland, 9 nights fall to freezing, 1 days stay below freezing all day and snowfall averages 1.7 inches.
Snow falls on 1 day in a normal January, and an inch or more covers the ground on 1 day.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USW00024229.
How humid and windy is Portland in January?
At 3 p.m. the normal temperature is 48°F with 67% relative humidity and a dew point of 37°F; at 6 a.m. it is 40°F with 85% humidity. The wind averages 8.5 mph, most often from the southeast in the afternoon. A dew point under 50°F feels dry.
| Time | Temperature | Dew point | Humidity | Wind | Clear or few clouds |
|---|---|---|---|---|---|
| 6 a.m. | 40°F | 36°F | 85% | 7.4 mph | – |
| 9 a.m. | 41°F | 36°F | 84% | 8.0 mph | – |
| noon | 45°F | 37°F | 73% | 9.5 mph | – |
| 3 p.m. | 48°F | 37°F | 67% | 10.0 mph | – |
| 6 p.m. | 44°F | 37°F | 74% | 9.4 mph | – |
| 9 p.m. | 42°F | 36°F | 79% | 8.6 mph | – |
Source: NOAA NCEI 1991-2020 hourly normals, station USW00024229. Hourly normals exist only for NOAA's first-order stations; a dash where NOAA publishes no value for that hour (the sky at some hours).
What are the records for January in Portland?
The warmest January temperature on Portland's official record (since 1940) is 66°F, on January 18, 2005; the coldest is −2°F, on January 31, 1950. The wettest January brought 12.83 in (1953); the snowiest, 41.4 inches (1950).
The January mean against the 1991-2020 normal of 41.9°F: 2021 44.8°F (+2.9), 2022 41.8°F (−0.1), 2023 43.3°F (+1.4), 2024 40.3°F (−1.6), 2025 41.3°F (−0.6), 2026 41.7°F (−0.2). 2 of 6 ran warmer than normal.
| January | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 44.8°F | +2.9°F | 7.03 in |
| 2022 | 41.8°F | −0.1°F | 5.10 in |
| 2023 | 43.3°F | +1.4°F | 3.34 in |
| 2024 | 40.3°F | −1.6°F | 9.43 in |
| 2025 | 41.3°F | −0.6°F | 2.93 in |
| 2026 | 41.7°F | −0.2°F | 2.63 in |
Source: records: ACIS, NWS threaded record PDXthr; recent months: ACIS, station USW00024229. Records and recent months use complete months only.
How does January in Portland compare across Oregon?
Across the 105 places PlainClimate covers in Oregon, January normal highs run from 32°F in Halfway to 55°F in Bandon; Portland's is 48°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.