S
M
T
W
T
F
S
30
78°
44°
31
78°
40°
1
79°
43°
2
78°
46°
3
84°
39°
4
77°
39°
5
76°
44°
6
77°
39°
7
77°
39°
8
78°
40°
9
78°
38°
10
77°
40°
11
78°
37°
12
75°
35°
13
Hist. Avg.
77°
35°
14
Hist. Avg.
77°
34°
15
Hist. Avg.
76°
34°
16
Hist. Avg.
76°
34°
17
Hist. Avg.
76°
34°
18
Hist. Avg.
76°
34°
19
Hist. Avg.
75°
33°
20
Hist. Avg.
75°
33°
21
Hist. Avg.
75°
33°
22
Hist. Avg.
74°
33°
23
Hist. Avg.
74°
32°
24
Hist. Avg.
74°
32°
25
Hist. Avg.
73°
32°
26
Hist. Avg.
73°
32°
27
Hist. Avg.
72°
32°
28
Hist. Avg.
72°
31°
29
Hist. Avg.
72°
31°
30
Hist. Avg.
71°
31°
1
Hist. Avg.
71°
30°
2
Hist. Avg.
71°
30°
3
Hist. Avg.
70°
30°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in Calpine
Calpine's September 2026 forecast shows daily high temperatures ranging from 75° to 84°, with overnight lows between 35° and 46°. The average high for September is 78° with an average low of 40°. 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 Calpine. See also: October | November | December.
