S
M
T
W
T
F
S
30
81°
39°
31
71°
38°
1
68°
47°
2
70°
50°
3
78°
41°
4
73°
38°
5
67°
42°
6
72°
47°
7
75°
39°
8
78°
34°
9
68°
34°
10
64°
35°
11
62°
37°
12
62°
34°
13
63°
37°
14
64°
43°
15
65°
45°
16
66°
38°
17
73°
35°
18
60°
39°
19
60°
42°
20
67°
38°
21
62°
39°
22
63°
35°
23
59°
36°
24
58°
35°
25
64°
35°
26
57°
30°
27
66°
39°
28
54°
27°
29
53°
28°
30
Hist. Avg.
58°
35°
1
Hist. Avg.
57°
35°
2
Hist. Avg.
57°
34°
3
Hist. Avg.
57°
34°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in Kelso
Kelso's September 2026 forecast shows daily high temperatures ranging from 53° to 81°, with overnight lows between 27° and 50°. The average high for September is 66° with an average low of 38°. 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 Kelso. See also: October | November | December.
