S
M
T
W
T
F
S
30
93°
68°
31
91°
64°
1
93°
64°
2
91°
63°
3
93°
64°
4
97°
63°
5
95°
63°
6
97°
66°
7
97°
68°
8
N/A
9
88°
69°
10
82°
66°
11
79°
60°
12
77°
59°
13
77°
55°
14
79°
56°
15
82°
55°
16
83°
60°
17
82°
58°
18
80°
59°
19
80°
58°
20
78°
57°
21
75°
53°
22
77°
54°
23
76°
52°
24
75°
51°
25
77°
51°
26
77°
54°
27
76°
54°
28
76°
51°
29
73°
50°
30
73°
54°
1
74°
56°
2
75°
52°
3
72°
50°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in Costano
Costano's September 2026 forecast shows daily high temperatures ranging from 72° to 88°, with overnight lows between 50° and 69°. The average high for September is 78° with an average low of 56°. 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 Costano. See also: October | November | December.
