S
M
T
W
T
F
S
30
85°
64°
31
84°
64°
1
84°
65°
2
87°
64°
3
84°
68°
4
88°
67°
5
88°
66°
6
87°
62°
7
84°
67°
8
85°
67°
9
83°
66°
10
81°
65°
11
86°
64°
12
86°
65°
13
85°
65°
14
85°
64°
15
84°
65°
16
85°
64°
17
84°
64°
18
84°
62°
19
82°
62°
20
83°
57°
21
81°
62°
22
79°
62°
23
82°
61°
24
82°
59°
25
81°
57°
26
82°
60°
27
81°
61°
28
81°
59°
29
80°
58°
30
79°
57°
1
80°
58°
2
80°
58°
3
81°
59°
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 88°, with overnight lows between 57° and 68°. The average high for September is 83° with an average low of 63°. 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.
