S
M
T
W
T
F
S
26
90°
79°
27
91°
78°
28
90°
79°
29
92°
79°
30
92°
78°
31
91°
79°
1
92°
79°
2
92°
78°
3
91°
79°
4
89°
80°
5
88°
79°
6
88°
79°
7
90°
77°
8
92°
78°
9
92°
78°
10
91°
77°
11
90°
78°
12
93°
77°
13
93°
78°
14
92°
78°
15
91°
76°
16
91°
78°
17
90°
78°
18
89°
77°
19
90°
78°
20
90°
78°
21
92°
77°
22
92°
77°
23
91°
76°
24
91°
78°
25
92°
77°
26
91°
76°
27
92°
76°
28
90°
77°
29
90°
78°
30
91°
77°
31
90°
78°
1
89°
77°
2
89°
77°
3
90°
79°
4
91°
78°
5
90°
78°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
August Weather in Caribbean Key
Caribbean Key's August 2026 forecast shows daily high temperatures ranging from 88° to 93°, with overnight lows between 76° and 80°. The average high for August is 91° with an average low of 78°. AccuWeather's monthly forecast extends further ahead than any other source, with day-by-day RealFeel® Temperatures giving a complete picture of how August weather will actually feel in Caribbean Key. See also: September | October | November.
