S
M
T
W
T
F
S
30
92°
74°
31
92°
73°
1
91°
74°
2
91°
75°
3
90°
74°
4
90°
73°
5
92°
74°
6
92°
73°
7
89°
74°
8
91°
74°
9
90°
75°
10
89°
74°
11
90°
73°
12
89°
74°
13
89°
74°
14
90°
72°
15
91°
74°
16
92°
74°
17
90°
72°
18
90°
71°
19
89°
71°
20
91°
74°
21
91°
73°
22
90°
74°
23
91°
73°
24
90°
73°
25
90°
71°
26
89°
71°
27
88°
72°
28
87°
70°
29
88°
69°
30
87°
70°
1
86°
69°
2
87°
70°
3
88°
71°
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 86° to 92°, with overnight lows between 69° and 75°. The average high for September is 90° with an average low of 73°. 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.
