January is one of the warmer months of the year in Portland, with average highs near 19.5°C and lows around 15.2°C (mean 17.4°C). It is one of the drier months, averaging 39 mm of rainfall and 74% relative humidity across the period.
January is one of the warmer months of the year in Portland. Across 45 years of records, the warmest Januarys in Portland were 1981, 2019 and 2022 — when the month averaged 18.8°C — while the coldest was 1992 at 15.1°C. Typical January days reach 19.5°C with nights near 15.2°C. The long-term trend is warming, about 0.2°C per decade.
January is one of the drier months in Portland, averaging 39 mm of rainfall. The wettest January on record was 2011 with 132 mm, while the driest was 2019 at 2 mm.
Relative humidity in Portland during January averages 74%. The most humid January was 1999 at 80%, and the least humid was 1983 at 69%.
January receives about 6.9 kWh/m²/day of solar energy in Portland. The sunniest January was 2009 at 7.7 kWh/m²/day, and the cloudiest were 1996, 2001 and 2022 at 6.4.
Average wind speed in Portland during January is 5.3 m/s. The windiest January was 1994 at 6.1 m/s, while the calmest were 1993 and 2011 at 4.5 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 17.2°C | 16.9°C | 17.1°C | 17.8°C | 17.8°C | +0.6°C |
| Avg High | 19.5°C | 19.1°C | 19.2°C | 20.0°C | 19.9°C | +0.4°C |
| Avg Low | 14.9°C | 14.8°C | 15.0°C | 15.7°C | 15.8°C | +0.9°C |
| Avg Rain | 32 mm | 43 mm | 33 mm | 36 mm | 54 mm | +22 mm |
January temperatures in Portland have risen by about 0.5°C between 1981–1985 and 2021–2025.
January has ranged from a record low of 11.3°C (1983) to a record high of 34.9°C (2019).
Rainfall in January is one of the drier months, averaging 39 mm, with a wettest year of 132 mm.
One of the best times to visit Portland
January is one of the best times to visit Portland. Expect days averaging 19.5°C and nights around 15.2°C (mean 17.4°C) — warmer than Portland's yearly average — with moderate rainfall (39 mm), so conditions are generally comfortable for sightseeing and outdoor plans.
| Year | Avg High | Avg Temp | Avg Low | Hottest Day | Coldest Day | Rainfall | Humidity | Wind | Solar |
|---|---|---|---|---|---|---|---|---|---|
| 2025 | 20.8°C | 18.7°C | 16.5°C | 28.9°C | 13.9°C | 12 mm | 73% | 4.9 m/s | 7.1 |
| 2024 | 19.4°C | 17.6°C | 15.8°C | 25.5°C | 14.5°C | 59 mm | 79% | 5.4 m/s | 6.8 |
| 2023 | 19.6°C | 17.5°C | 15.5°C | 28.6°C | 13.6°C | 22 mm | 76% | 4.8 m/s | 7.4 |
| 2022 | 21.0°C | 18.8°C | 16.7°C | 27.5°C | 14.0°C | 78 mm | 79% | 5.3 m/s | 6.4 |
| 2021 | 18.7°C | 16.8°C | 14.8°C | 31.3°C | 13.1°C | 84 mm | 79% | 5.5 m/s | 6.6 |
| 2020 | 19.7°C | 17.6°C | 15.4°C | 29.3°C | 13.7°C | 71 mm | 74% | 5.3 m/s | 6.5 |
| 2019 | 21.1°C | 18.8°C | 16.5°C | 34.9°C | 14.7°C | 2 mm | 73% | 4.6 m/s | 7.3 |
| 2018 | 20.7°C | 18.5°C | 16.2°C | 32.2°C | 14.1°C | 18 mm | 72% | 4.9 m/s | 7.2 |
| 2017 | 19.5°C | 17.5°C | 15.5°C | 29.3°C | 14.1°C | 37 mm | 74% | 4.8 m/s | 7.1 |
| 2016 | 19.5°C | 17.7°C | 15.8°C | 27.3°C | 14.4°C | 25 mm | 76% | 5 m/s | 7 |
| 2015 | 19.4°C | 17.3°C | 15.2°C | 29.7°C | 13.7°C | 55 mm | 74% | 5.8 m/s | 6.6 |
| 2014 | 20.6°C | 18.1°C | 15.5°C | 34.8°C | 12.6°C | 24 mm | 72% | 5.5 m/s | 7.5 |
| 2013 | 19.7°C | 17.6°C | 15.5°C | 31.0°C | 13.8°C | 20 mm | 70% | 4.9 m/s | 7.4 |
| 2012 | 20.7°C | 18.4°C | 16.2°C | 30.2°C | 13.9°C | 28 mm | 72% | 5.9 m/s | 6.9 |
| 2011 🌧️ | 19.4°C | 17.4°C | 15.4°C | 27.3°C | 13.5°C | 132 mm | 79% | 4.5 m/s | 6.7 |
| 2010 | 19.3°C | 17.0°C | 14.8°C | 30.4°C | 13.5°C | 17 mm | 72% | 4.8 m/s | 7.2 |
| 2009 | 19.4°C | 17.0°C | 14.7°C | 30.1°C | 11.9°C | 8 mm | 72% | 4.7 m/s | 7.7 |
| 2008 | 19.2°C | 17.3°C | 15.3°C | 30.1°C | 14.0°C | 18 mm | 76% | 5.1 m/s | 7.2 |
| 2007 | 20.4°C | 17.9°C | 15.5°C | 28.2°C | 13.2°C | 102 mm | 75% | 5 m/s | 6.6 |
| 2006 | 19.5°C | 17.3°C | 15.2°C | 31.2°C | 12.8°C | 34 mm | 76% | 5 m/s | 7.2 |
| 2005 | 19.4°C | 17.2°C | 15.0°C | 29.9°C | 12.6°C | 28 mm | 74% | 5.4 m/s | 7 |
| 2004 | 17.3°C | 15.8°C | 14.3°C | 25.2°C | 12.8°C | 40 mm | 75% | 5.3 m/s | 6.8 |
| 2003 | 19.8°C | 17.3°C | 14.8°C | 29.1°C | 13.2°C | 37 mm | 73% | 5.4 m/s | 7 |
| 2002 | 17.6°C | 15.8°C | 14.0°C | 24.3°C | 11.9°C | 28 mm | 78% | 5.3 m/s | 6.5 |
| 2001 | 20.8°C | 18.4°C | 16.0°C | 29.8°C | 14.1°C | 14 mm | 75% | 5.4 m/s | 6.4 |
| 2000 | 18.9°C | 17.0°C | 15.0°C | 28.8°C | 12.6°C | 21 mm | 74% | 5.8 m/s | 6.5 |
| 1999 | 19.2°C | 17.2°C | 15.2°C | 30.5°C | 13.6°C | 17 mm | 80% | 5.5 m/s | 6.8 |
| 1998 | 19.5°C | 17.4°C | 15.2°C | 29.9°C | 12.9°C | 31 mm | 76% | 5 m/s | 6.6 |
| 1997 | 20.7°C | 18.0°C | 15.2°C | 30.8°C | 13.0°C | 43 mm | 71% | 5.4 m/s | 7.1 |
| 1996 | 18.3°C | 16.1°C | 14.0°C | 32.0°C | 11.8°C | 46 mm | 77% | 6 m/s | 6.4 |
| 1995 | 19.4°C | 17.1°C | 14.9°C | 26.8°C | 12.7°C | 38 mm | 77% | 5.2 m/s | 6.9 |
| 1994 | 18.0°C | 15.9°C | 13.7°C | 28.5°C | 11.7°C | 51 mm | 72% | 6.1 m/s | 7.3 |
| 1993 | 20.0°C | 17.7°C | 15.3°C | 29.8°C | 13.4°C | 48 mm | 76% | 4.5 m/s | 6.8 |
| 1992 ❄️ | 16.7°C | 15.1°C | 13.6°C | 24.0°C | 12.4°C | 16 mm | 76% | 5.6 m/s | 6.6 |
| 1991 | 19.6°C | 17.5°C | 15.4°C | 32.9°C | 13.5°C | 125 mm | 75% | 5.4 m/s | 6.8 |
| 1990 | 19.6°C | 17.3°C | 15.0°C | 30.2°C | 12.0°C | 16 mm | 71% | 5.3 m/s | 7.1 |
| 1989 | 20.2°C | 17.7°C | 15.2°C | 30.0°C | 12.9°C | 33 mm | 71% | 5.6 m/s | 6.9 |
| 1988 | 20.6°C | 18.2°C | 15.7°C | 29.5°C | 14.0°C | 30 mm | 72% | 5 m/s | 6.9 |
| 1987 | 17.4°C | 15.5°C | 13.6°C | 25.1°C | 11.6°C | 50 mm | 74% | 5.9 m/s | 6.6 |
| 1986 | 18.1°C | 16.3°C | 14.4°C | 26.9°C | 13.4°C | 21 mm | 73% | 5.5 m/s | 7.5 |
| 1985 | 19.1°C | 16.8°C | 14.5°C | 30.4°C | 12.6°C | 16 mm | 72% | 5.4 m/s | 7 |
| 1984 | 18.8°C | 16.7°C | 14.7°C | 25.9°C | 12.4°C | 25 mm | 72% | 5.5 m/s | 6.7 |
| 1983 | 18.8°C | 16.3°C | 13.8°C | 31.0°C | 11.3°C | 37 mm | 69% | 5.5 m/s | — |
| 1982 | 21.2°C | 18.5°C | 15.8°C | 32.2°C | 13.5°C | 34 mm | 70% | 5.4 m/s | — |
| 1981 🔥 | 21.5°C | 18.8°C | 16.2°C | 33.7°C | 14.3°C | 46 mm | 73% | 5.3 m/s | — |
Actual recorded January data for each year, 1981–2025 — sourced from NASA POWER.
The average high in January is around 19.5°C with lows near 15.2°C (mean 17.4°C), based on 45 years of NASA POWER data.
January averages 39 mm of rainfall in Portland, one of the drier months. The wettest on record was 132 mm in 2011.
The hottest January reached 34.9°C in 2019. The coldest dipped to 11.3°C in 1983.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average January temperatures have risen by about 0.5°C. Daytime highs moved from 19.9°C to 19.9°C and overnight lows from 15°C to 15.9°C over the same span.
January is one of the warmer months of the year in Portland and one of the drier months, so plan for around 19.5°C daytime highs and 15.2°C at night.
Not quite — January is the 11th coolest month in Portland, averaging 17.4°C.
For January in Portland, pack light layers you can adjust through the day, with typical highs of 19.5°C and lows of 15.2°C.
Relative humidity in January averages 74% — moderately humid.
Average wind speed in January is 5.3 m/s. The windiest January on record averaged 6.1 m/s (1994).
The wettest January on record was 2011 with 132 mm. On average, January sees 39 mm.
All figures are derived from NASA POWER (Prediction Of Worldwide Energy Resources), based on MERRA-2 satellite reanalysis, covering 1981–2025.
Explore how the weather in Portland behaves each January, based on 45 years of NASA POWER climate data from 1981 to 2025. This page breaks down average temperatures, rainfall, humidity, wind and solar radiation for January specifically, along with year-by-year records and how the month has changed over the decades.
