S
M
T
W
T
F
S
31
90°
55°
1
90°
59°
2
81°
64°
3
86°
63°
4
90°
64°
5
93°
68°
6
70°
57°
7
81°
52°
8
82°
48°
9
84°
55°
10
88°
59°
11
91°
63°
12
91°
63°
13
91°
63°
14
91°
61°
15
88°
66°
16
91°
63°
17
91°
64°
18
93°
64°
19
90°
64°
20
90°
61°
21
91°
64°
22
86°
68°
23
90°
68°
24
81°
68°
25
81°
66°
26
82°
59°
27
84°
55°
28
86°
55°
29
86°
57°
30
88°
59°
1
90°
61°
2
84°
61°
3
81°
55°
4
82°
54°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Walnut
Walnut's September 2025 forecast shows daily high temperatures ranging from ° to °, with overnight lows between ° and °. The average high for September is ° with an average low of °. 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. See also: October | November | December.
