S
M
T
W
T
F
S
30
75°
42°
31
83°
46°
1
85°
54°
2
76°
54°
3
72°
42°
4
70°
48°
5
68°
48°
6
60°
46°
7
75°
43°
8
79°
44°
9
84°
52°
10
81°
47°
11
71°
52°
12
70°
49°
13
74°
43°
14
75°
45°
15
78°
48°
16
79°
47°
17
78°
49°
18
79°
53°
19
81°
53°
20
80°
47°
21
76°
48°
22
89°
46°
23
74°
43°
24
78°
44°
25
69°
46°
26
69°
43°
27
68°
40°
28
67°
38°
29
66°
36°
30
66°
36°
1
69°
45°
2
70°
44°
3
69°
39°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Ahtanum
Ahtanum's September 2026 forecast shows daily high temperatures ranging from 66° to 89°, with overnight lows between 36° and 53°. The average high for September is 74° with an average low of 45°. 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 Ahtanum. See also: October | November | December.
