S
M
T
W
T
F
S
30
88°
69°
31
89°
69°
1
88°
68°
2
85°
68°
3
84°
67°
4
84°
64°
5
83°
62°
6
84°
64°
7
85°
66°
8
86°
66°
9
83°
65°
10
83°
65°
11
82°
60°
12
84°
61°
13
87°
63°
14
83°
58°
15
80°
58°
16
79°
57°
17
80°
58°
18
82°
59°
19
86°
58°
20
86°
61°
21
85°
62°
22
85°
63°
23
84°
62°
24
82°
59°
25
84°
59°
26
85°
61°
27
85°
57°
28
84°
60°
29
84°
60°
30
83°
59°
1
84°
59°
2
84°
58°
3
83°
52°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Walnut Grove
Walnut Grove's September 2026 forecast shows daily high temperatures ranging from 79° to 89°, with overnight lows between 52° and 69°. The average high for September is 84° with an average low of 62°. 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 Walnut Grove. See also: October | November | December.
