S
M
T
W
T
F
S
30
76°
42°
31
82°
49°
1
87°
54°
2
77°
53°
3
71°
50°
4
69°
49°
5
74°
53°
6
77°
54°
7
79°
55°
8
80°
54°
9
79°
55°
10
81°
57°
11
80°
56°
12
79°
57°
13
80°
54°
14
81°
49°
15
83°
53°
16
77°
49°
17
70°
47°
18
71°
43°
19
71°
50°
20
69°
46°
21
69°
43°
22
68°
41°
23
68°
44°
24
67°
41°
25
68°
42°
26
74°
47°
27
76°
50°
28
70°
49°
29
66°
46°
30
68°
45°
1
74°
49°
2
66°
48°
3
65°
48°
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 65° to 87°, with overnight lows between 41° and 57°. The average high for September is 74° with an average low of 49°. 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.
