Last updated: June 24, 2025
In January, the average temperature in Portland, United States hovers around 0°C (32°F), providing a chilly backdrop for the month. Temperatures can dip as low as -20°C (-3°F), while the mercury might rise to a maximum of 20°C (68°F). Expect about 67 mm (2.6 in) of precipitation spread across 8 days, with an average humidity level of 84% making the air feel crisp and damp.
In January in Portland, the average temperature is 0°C (32°F). Maximums can reach 20°C (68°F), and minimums can be as low as -20°C (-3°F). Be prepared for a wide range of temperatures, making it essential to pack layers when traveling during this time.
In Portland in January, the total precipitation amount is 67 mm (2.6 in) over the course of 8 days.
In Portland in January, humidity is 84%. With an average temperature of 0°C (32°F), this humidity feels like a cold, damp chill that seeps into your clothes, making traveling uncomfortable and necessitating extra layers to stay warm despite the moisture-laden air.
In Portland in January, the maximum UV index is 3, which corresponds to a moderate Exposure Category. The time to burn is approximately 30 minutes. For more details on the hourly UV index in Portland, you can check the information here.
UV Risk Categories
Weather in Portland varies notably across the year, with each month offering distinct climate conditions. This page compares January’s weather to other months in Portland, focusing on differences in temperature, rainfall, humidity, and UV levels.
Temperature | Precipitation | Humidity | UV | |
---|---|---|---|---|
January Weather | 0°C (32°F) | 67 mm (2.6 inches) | 84% | moderate |
February Weather | 1°C (34°F) | 89 mm (3.5 inches) | 82% | moderate |
March Weather | 4°C (40°F) | 90 mm (3.6 inches) | 81% | high |
April Weather | 10°C (49°F) | 126 mm (5.0 inches) | 78% | very high |
May Weather | 15°C (60°F) | 111 mm (4.4 inches) | 69% | very high |
June Weather | 20°C (69°F) | 94 mm (3.7 inches) | 69% | very high |
July Weather | 24°C (75°F) | 156 mm (6.1 inches) | 62% | very high |
August Weather | 23°C (74°F) | 96 mm (3.8 inches) | 65% | very high |
September Weather | 20°C (67°F) | 99 mm (3.9 inches) | 68% | very high |
October Weather | 14°C (58°F) | 130 mm (5.1 inches) | 74% | high |
November Weather | 7°C (44°F) | 90 mm (3.6 inches) | 82% | moderate |
December Weather | 2°C (36°F) | 127 mm (5.0 inches) | 80% | low |