S
M
T
W
T
F
S
30
86°
50°
31
74°
50°
1
72°
55°
2
72°
56°
3
73°
48°
4
79°
50°
5
81°
48°
6
86°
51°
7
93°
53°
8
94°
57°
9
96°
56°
10
95°
56°
11
94°
55°
12
90°
56°
13
88°
54°
14
90°
52°
15
87°
56°
16
84°
55°
17
89°
56°
18
88°
53°
19
82°
52°
20
84°
55°
21
85°
55°
22
88°
54°
23
82°
52°
24
80°
48°
25
79°
48°
26
79°
49°
27
78°
48°
28
78°
48°
29
79°
49°
30
79°
52°
1
78°
47°
2
78°
48°
3
83°
53°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Calistoga
Calistoga's September 2026 forecast shows daily high temperatures ranging from 72° to 96°, with overnight lows between 47° and 57°. The average high for September is 84° with an average low of 52°. 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 Calistoga. See also: October | November | December.
