S
M
T
W
T
F
S
30
89°
74°
31
94°
75°
1
92°
76°
2
89°
80°
3
88°
82°
4
89°
82°
5
89°
83°
6
88°
83°
7
87°
77°
8
89°
76°
9
88°
77°
10
90°
78°
11
89°
77°
12
89°
76°
13
90°
77°
14
88°
76°
15
89°
75°
16
87°
76°
17
86°
77°
18
86°
77°
19
86°
77°
20
87°
76°
21
86°
77°
22
86°
77°
23
85°
76°
24
86°
77°
25
86°
77°
26
87°
76°
27
86°
76°
28
86°
75°
29
84°
76°
30
85°
74°
1
84°
75°
2
85°
74°
3
84°
75°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Cayo Costa
Cayo Costa's September 2026 forecast shows daily high temperatures ranging from 84° to 90°, with overnight lows between 74° and 83°. The average high for September is 87° with an average low of 77°. 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 Cayo Costa. See also: October | November | December.
