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Portland, OR Weather


Portland, OR climate is mild during summer when temperatures tend to be in the 60's and cold during winter when temperatures tend to be in the 40's.

The warmest month of the year is August with an average maximum temperature of 79.10 degrees Fahrenheit, while the coldest month of the year is January with an average minimum temperature of 36.70 degrees Fahrenheit.

Temperature variations between night and day tend to be moderate during summer with a difference that can reach 21 degrees Fahrenheit, and fairly limited during winter with an average difference of 10 degrees Fahrenheit.

The annual average precipitation at Portland is 43.16 Inches. Winter months tend to be wetter than summer months. The wettest month of the year is December with an average rainfall of 6.75 Inches.

Weather Data

Normal Climate

Normal Temperatures

(PORTLAND KGW TV Weather station, 0.34 miles from Portland)
Month Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Annual
Max °F 45.5 50.1 55.5 60.8 67.0 72.6 78.9 79.1 74.2 63.0 51.4 45.5 62.0
Mean °F 41.1 44.3 48.1 52.2 57.8 62.9 68.1 68.5 64.4 55.6 46.6 41.4 54.3
Min °F 36.7 38.5 40.7 43.5 48.5 53.2 57.3 57.9 54.6 48.1 41.8 37.3 46.5

Normal Precipitation

(PORTLAND KGW TV Weather station, 0.34 miles from Portland)
Month Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Annual
Inch 6.24 5.07 4.51 3.10 2.49 1.60 0.76 0.99 1.87 3.39 6.39 6.75 43.16