S
M
T
W
T
F
S
30
79°
49°
31
82°
53°
1
87°
56°
2
89°
58°
3
88°
55°
4
79°
47°
5
77°
48°
6
78°
50°
7
81°
52°
8
83°
55°
9
79°
49°
10
80°
47°
11
78°
49°
12
78°
53°
13
75°
45°
14
74°
44°
15
72°
43°
16
73°
42°
17
73°
44°
18
74°
45°
19
78°
51°
20
83°
49°
21
79°
46°
22
73°
44°
23
70°
43°
24
69°
42°
25
67°
40°
26
68°
41°
27
69°
40°
28
72°
44°
29
73°
41°
30
66°
37°
1
Hist. Avg.
70°
43°
2
Hist. Avg.
70°
43°
3
Hist. Avg.
69°
42°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Okanogan
Okanogan's September 2026 forecast shows daily high temperatures ranging from 66° to 89°, with overnight lows between 37° and 58°. The average high for September is 76° 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 Okanogan. See also: October | November | December.
