Climate averages 1991–2020
Portland weather
in January.
A cool, wet month: the 11th warmest and the 10th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
January is a cool month in Portland: daytime highs average 8.4°C and nights cool to about 1.7°C. By daytime temperature it is the 11th warmest of the 12 months.
Expect about 167 mm of rain on roughly 17 days, which makes January a wet month (the 10th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 9 h 08 min on an average January day.
The nearest other city in this atlas is Beaverton (11 km away). In January its highs average 7.9°C, about as warm as Portland, with 167 mm of rain.
Among the 498 cities listed in the United States, Portland ranks joint 268th of 498 for the warmest January highs and joint 482nd of 498 for the driest January (rainfall, lowest first). The mean January high of those 498 cities is 9.5°C; Portland is 1.1°C cooler than that mean.
From January to February, average highs rise by 1.7°C to 10.1°C, and monthly rainfall falls from 167 mm to 130 mm.
The annual picture
January in context
Monthly rainfall
Average total · mmAverages from hourly ERA5 reanalysis data. Actual weather varies from year to year. How these numbers are calculated
Every month, side by side
Portland climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January, selected | 8.4°C1.7°C | 1.7°C | 167 | 17.3 | 9.19 h |
| February | 10.1°C2.0°C | 2.0°C | 130 | 15.0 | 10.310 h |
| March | 12.4°C3.4°C | 3.4°C | 145 | 17.5 | 11.912 h |
| April | 14.9°C5.4°C | 5.4°C | 115 | 16.1 | 13.513 h |
| May | 18.8°C8.8°C | 8.8°C | 70 | 11.1 | 14.915 h |
| June | 21.8°C11.3°C | 11.3°C | 43 | 7.6 | 15.616 h |
| July | 27.1°C14.1°C | 14.1°C | 12 | 2.3 | 15.315 h |
| August | 27.6°C14.6°C | 14.6°C | 14 | 2.6 | 14.114 h |
| September | 24.1°C12.3°C | 12.3°C | 42 | 6.2 | 12.613 h |
| October | 17.0°C8.1°C | 8.1°C | 106 | 11.8 | 11.011 h |
| November | 11.1°C4.2°C | 4.2°C | 174 | 17.3 | 9.610 h |
| December | 7.7°C1.7°C | 1.7°C | 193 | 18.0 | 8.89 h |
Rainfall is the average of the 30 separate monthly totals. A rain day is a local calendar day with at least 1 mm of precipitation. Daylight is the calculated sunrise-to-sunset length, not measured sunshine.
Compare places
January in nearby cities
- Beaverton in JanuaryUnited States · 11 kmHigh 7.9°C · Low 1.6°C · 167 mm rain
- Vancouver, United States in JanuaryUnited States · 13 kmHigh 7.8°C · Low 1.4°C · 209 mm rain
- Gresham in JanuaryUnited States · 19 kmHigh 7.5°C · Low 1.1°C · 220 mm rain
- Hillsboro in JanuaryUnited States · 24 kmHigh 7.9°C · Low 1.8°C · 172 mm rain
- Salem, United States in JanuaryUnited States · 70 kmHigh 8.8°C · Low 2.0°C · 154 mm rain
- Eugene in JanuaryUnited States · 167 kmHigh 9.0°C · Low 1.3°C · 176 mm rain
- Tacoma in JanuaryUnited States · 193 kmHigh 7.3°C · Low 1.7°C · 165 mm rain
- Bend in JanuaryUnited States · 195 kmHigh 3.8°C · Low -4.7°C · 71 mm rain
Read the numbers correctly
Climate, not a promise.
These patterns help compare months. They cannot tell you the weather on a specific day of your trip.
Sources, method and limitsHow these numbers are made (what the highs, lows and rain days mean, the sources and the model cell used for Portland) is explained once on the Portland year overview and on the Sources, method and limits page.
Beaverton lies in the same rainfall cell, so its rainfall figures are identical to these; temperatures differ because they come from smaller 0.1° cells.