Portland weather in January
January is one of the least pleasant months in Portland: highs of 7°C (44°F) and about 216 mm (8.5 in) of rain on average. Nights average 1°C (33°F) and cloud cover 79% (NASA POWER, 2001–2025 averages). It is the 3rd wettest month of the year and the 2nd coolest. Compared with December, it is warmer and about as wet; February brings highs of 8°C (46°F) and 144 mm (5.7 in) of rain.
Is January a good time to visit Portland?
least pleasant month Weather score 8/100.
January is one of the least pleasant months for weather in Portland. For better conditions, consider May–Sep.
Does it rain a lot in Portland in January?
Yes, it is one of the rainy months: about 216 mm (8.5 in) falls in an average January. It is the 3rd wettest month of the year.
How warm is Portland in January?
Days average 7°C (44°F) and nights 1°C (33°F).
Portland weather by month
| Month | High | Low | Rain | Cloud | Weather |
|---|---|---|---|---|---|
| January | 7°C (44°F) | 1°C (33°F) | 216 mm | 79% | least pleasant |
| February | 8°C (46°F) | 1°C (33°F) | 144 mm | 75% | least pleasant |
| March | 10°C (51°F) | 2°C (36°F) | 178 mm | 78% | least pleasant |
| April | 13°C (56°F) | 4°C (39°F) | 119 mm | 75% | fair |
| May | 17°C (63°F) | 7°C (45°F) | 79 mm | 68% | best |
| June | 21°C (69°F) | 9°C (49°F) | 55 mm | 62% | best |
| July | 26°C (79°F) | 12°C (53°F) | 11 mm | 39% | best |
| August | 28°C (82°F) | 12°C (53°F) | 20 mm | 40% | best |
| September | 23°C (74°F) | 10°C (49°F) | 57 mm | 47% | best |
| October | 16°C (61°F) | 6°C (43°F) | 137 mm | 63% | fair |
| November | 10°C (49°F) | 3°C (37°F) | 217 mm | 77% | least pleasant |
| December | 6°C (42°F) | 0°C (33°F) | 251 mm | 81% | least pleasant |
Sources: 2001–2025 monthly averages from NASA POWER (MERRA-2 reanalysis). Page updated . How we rate months