S
M
T
W
T
F
S
30
74°
48°
31
86°
51°
1
66°
57°
2
66°
56°
3
62°
49°
4
72°
47°
5
75°
50°
6
75°
53°
7
74°
54°
8
80°
51°
9
86°
51°
10
72°
54°
11
69°
50°
12
64°
51°
13
62°
53°
14
69°
55°
15
69°
52°
16
79°
52°
17
83°
52°
18
74°
52°
19
76°
53°
20
77°
52°
21
73°
52°
22
73°
49°
23
73°
50°
24
75°
52°
25
75°
51°
26
73°
53°
27
72°
52°
28
73°
51°
29
72°
48°
30
66°
44°
1
67°
43°
2
66°
50°
3
66°
45°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Kelso
Kelso's September 2026 forecast shows daily high temperatures ranging from 66° to 83°, with overnight lows between 43° and 53°. The average high for September is 73° with an average low of 50°. 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.
