S
M
T
W
T
F
S
30
62°
52°
31
62°
53°
1
64°
53°
2
64°
52°
3
63°
53°
4
64°
53°
5
63°
51°
6
61°
52°
7
60°
51°
8
61°
50°
9
60°
48°
10
60°
51°
11
61°
47°
12
59°
50°
13
59°
47°
14
60°
49°
15
59°
48°
16
59°
49°
17
60°
47°
18
59°
48°
19
62°
47°
20
59°
46°
21
58°
49°
22
58°
46°
23
57°
44°
24
57°
45°
25
58°
49°
26
57°
50°
27
57°
47°
28
58°
45°
29
56°
44°
30
57°
44°
1
56°
45°
2
58°
49°
3
57°
44°
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 56° to 64°, with overnight lows between 44° and 53°. The average high for September is 60° 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 Kelso. See also: October | November | December.
