S
M
T
W
T
F
S
30
90°
73°
31
91°
77°
1
88°
78°
2
88°
78°
3
87°
77°
4
92°
76°
5
94°
76°
6
94°
75°
7
85°
76°
8
90°
76°
9
92°
75°
10
92°
76°
11
91°
74°
12
92°
76°
13
92°
76°
14
89°
75°
15
92°
76°
16
88°
75°
17
90°
74°
18
90°
75°
19
89°
73°
20
86°
74°
21
86°
74°
22
87°
74°
23
86°
73°
24
86°
74°
25
87°
74°
26
86°
73°
27
87°
74°
28
85°
74°
29
86°
73°
30
86°
73°
1
85°
72°
2
85°
73°
3
87°
72°
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 85° to 92°, with overnight lows between 72° and 76°. The average high for September is 88° with an average low of 74°. 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.
