S
M
T
W
T
F
S
30
76°
45°
31
87°
48°
1
82°
57°
2
77°
54°
3
64°
49°
4
71°
45°
5
71°
47°
6
63°
50°
7
73°
51°
8
79°
45°
9
85°
48°
10
87°
56°
11
75°
50°
12
77°
48°
13
66°
51°
14
69°
48°
15
67°
45°
16
76°
45°
17
63°
47°
18
78°
52°
19
81°
49°
20
87°
53°
21
86°
51°
22
77°
51°
23
73°
47°
24
77°
47°
25
71°
49°
26
66°
42°
27
62°
40°
28
71°
40°
29
77°
52°
30
73°
46°
1
74°
46°
2
75°
45°
3
76°
46°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Pendleton
Pendleton's September 2026 forecast shows daily high temperatures ranging from 73° to 77°, with overnight lows between 45° and 52°. The average high for September is 75° with an average low of 47°. AccuWeather's monthly forecast extends further ahead than any other source, with day-by-day RealFeel® Temperatures giving a complete picture of how September weather will actually feel in Pendleton. See also: October | November | December.
