S
M
T
W
T
F
S
30
86°
48°
31
84°
54°
1
85°
54°
2
84°
53°
3
85°
49°
4
85°
45°
5
83°
45°
6
75°
43°
7
74°
43°
8
74°
52°
9
73°
45°
10
75°
51°
11
77°
42°
12
73°
47°
13
74°
51°
14
75°
48°
15
72°
43°
16
70°
45°
17
72°
50°
18
75°
49°
19
79°
45°
20
79°
43°
21
78°
43°
22
71°
40°
23
68°
42°
24
70°
49°
25
69°
39°
26
68°
41°
27
68°
42°
28
69°
44°
29
68°
39°
30
66°
41°
1
67°
47°
2
72°
48°
3
74°
44°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Santa Clara
Santa Clara's September 2026 forecast shows daily high temperatures ranging from 66° to 86°, with overnight lows between 39° and 54°. The average high for September is 75° with an average low of 46°. 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 Santa Clara. See also: October | November | December.
