S
M
T
W
T
F
S
30
97°
66°
31
97°
73°
1
99°
75°
2
99°
76°
3
100°
75°
4
101°
75°
5
102°
76°
6
103°
75°
7
96°
71°
8
99°
71°
9
97°
76°
10
99°
76°
11
92°
73°
12
96°
72°
13
101°
73°
14
98°
74°
15
101°
73°
16
100°
72°
17
100°
71°
18
99°
73°
19
97°
71°
20
91°
68°
21
89°
64°
22
85°
64°
23
87°
63°
24
87°
64°
25
88°
64°
26
83°
60°
27
87°
65°
28
87°
67°
29
87°
66°
30
86°
66°
1
87°
65°
2
87°
66°
3
86°
66°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Thompson Grove
Thompson Grove's September 2026 forecast shows daily high temperatures ranging from 83° to 101°, with overnight lows between 60° and 74°. The average high for September is 91° with an average low of 67°. 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 Thompson Grove. See also: October | November | December.
