S
M
T
W
T
F
S
30
73°
48°
31
64°
44°
1
68°
46°
2
70°
44°
3
67°
46°
4
71°
48°
5
72°
45°
6
70°
38°
7
61°
37°
8
60°
36°
9
59°
36°
10
60°
37°
11
60°
36°
12
64°
39°
13
65°
38°
14
64°
42°
15
60°
40°
16
58°
34°
17
57°
33°
18
57°
34°
19
58°
39°
20
65°
42°
21
66°
40°
22
63°
32°
23
60°
37°
24
57°
35°
25
55°
38°
26
58°
39°
27
59°
39°
28
57°
34°
29
53°
34°
30
54°
37°
1
53°
38°
2
60°
27°
3
53°
25°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Big Valley
Big Valley's September 2026 forecast shows daily high temperatures ranging from 53° to 73°, with overnight lows between 25° and 48°. The average high for September is 61° with an average low of 38°. 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 Big Valley. See also: October | November | December.
