S
M
T
W
T
F
S
30
74°
48°
31
75°
51°
1
73°
52°
2
73°
48°
3
74°
48°
4
76°
50°
5
72°
48°
6
72°
46°
7
73°
47°
8
79°
47°
9
81°
51°
10
81°
55°
11
80°
53°
12
82°
55°
13
81°
55°
14
79°
45°
15
75°
47°
16
74°
53°
17
80°
54°
18
81°
48°
19
80°
51°
20
79°
53°
21
75°
53°
22
78°
52°
23
79°
51°
24
77°
52°
25
77°
55°
26
78°
55°
27
78°
52°
28
68°
50°
29
67°
50°
30
68°
49°
1
67°
48°
2
65°
44°
3
64°
46°
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 64° to 82°, with overnight lows between 44° and 55°. The average high for September is 75° 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.
