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7 Days
14 Days
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Monthly
Precipitation
Temperature
Wind
Temperature Unit Selection
°Celsius
°Fahrenheit
Monthly Historical Averages
Portland International Airport, OR
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September
Average Temperature
High
23°
Feels 23
Low
12°
Feels 12
Average Precipitation
8 Days
Rain amount
43.6mm
Snow amount
0cm
Content continues below
Daily Historical Averages
September 2026
S
M
T
W
T
F
S
1
2
3
4
5
21°
6
21°
7
20°
8
24°
9
28°
10
27°
11
23°
12
24°
13
23°
14
24°
15
23°
16
23°
17
24°
18
24°
19
24°
20
21
22
23
24
25
26
27
28
29
30
Forecast
Saturday, September 5, 2026
Day
21°
Feels 21
Wind
8 km/h NW
Gust
12 km/h
Humidity
56%
P.O.P
30%
Night
12°
Feels 12
Wind
8 km/h N
Gust
12 km/h
Humidity
94%
P.O.P
30%
Historical Averages
Sep 5
High
Feels
Low
Feels
Precip Frequency
Total Daylight
Humidity
Historical Averages are based on data recorded from 2000 onwards.