Weather By Day

September Portland Weather 
September Portland Weather
Record High: 105°F
Normal High: 75°F
Normal Low: 52°F
Record Low: 34°F
Avg Monthly Rain: 1.65"
Rec 1 Day Rain: 2.23"

Portland Weather In September

In the last 70 years the highest measured temperature in Portland Oregon for September was 105 degrees Fahrenheit, registered on September 2, 1988, while the mean high temperature is 75. The lowest documented temperature in September for Portland for the past 70 years was 34 measured on September 22, 1961, and the regular low is 52.

According to National Weather Service historical Portland September Weather data, on September 26, 1948, the high temperature did not exceed 52 degrees Fahrenheit, the lowest high measured in Portland in the past 70 years. Weather Service records also indicate that on September 14, 2000, the low temperature for the day was not measured below 64 degrees, the highest low measured in Portland in the last 70 years.

Weather Service historical data shows that the average daily high temperature in Portland on September First is 44 degrees Fahrenheit and the average high on the last day of September is 39 degrees. The average daily low temperature in Portland on September First is 32 degrees Fahrenheit and the average low on the last day of September is 27 degrees.

Portland typically receives an average of 1.65 inches of precipitation during the month. September Portland Weather records indicated that on September 17, 1969 Portland received 2.23 inches of precipitation, the most rain recorded in a single day in September.