S
M
T
W
T
F
S
30
73°
58°
31
87°
65°
1
91°
70°
2
94°
70°
3
91°
67°
4
85°
61°
5
79°
58°
6
77°
60°
7
78°
56°
8
73°
55°
9
76°
58°
10
74°
57°
11
74°
53°
12
74°
55°
13
77°
54°
14
78°
57°
15
76°
57°
16
75°
56°
17
76°
53°
18
70°
49°
19
74°
54°
20
78°
57°
21
78°
56°
22
77°
56°
23
78°
55°
24
78°
54°
25
77°
54°
26
75°
52°
27
76°
53°
28
76°
54°
29
75°
52°
30
73°
50°
1
72°
51°
2
73°
51°
3
74°
50°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Campbell
Campbell's September 2026 forecast shows daily high temperatures ranging from 70° to 94°, with overnight lows between 49° and 70°. The average high for September is 77° with an average low of 56°. 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 Campbell. See also: October | November | December.
