S
M
T
W
T
F
S
30
76°
53°
31
90°
51°
1
81°
63°
2
78°
56°
3
66°
55°
4
73°
49°
5
69°
52°
6
65°
51°
7
75°
54°
8
79°
51°
9
86°
53°
10
86°
57°
11
75°
54°
12
72°
52°
13
62°
52°
14
71°
49°
15
73°
51°
16
78°
52°
17
78°
55°
18
77°
57°
19
80°
58°
20
76°
55°
21
77°
53°
22
76°
54°
23
85°
57°
24
80°
57°
25
68°
55°
26
69°
55°
27
68°
48°
28
65°
46°
29
66°
47°
30
65°
44°
1
70°
54°
2
71°
52°
3
75°
51°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Walla Walla
Walla Walla's September 2026 forecast shows daily high temperatures ranging from 62° to 86°, with overnight lows between 44° and 58°. The average high for September is 73° with an average low of 53°. 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 Walla Walla. See also: October | November | December.
