S
M
T
W
T
F
S
26
90°
82°
27
91°
82°
28
90°
83°
29
89°
82°
30
89°
83°
31
88°
83°
1
88°
82°
2
88°
83°
3
88°
83°
4
89°
82°
5
89°
83°
6
90°
83°
7
89°
82°
8
89°
83°
9
90°
83°
10
89°
82°
11
89°
83°
12
90°
82°
13
89°
83°
14
88°
83°
15
89°
82°
16
88°
83°
17
88°
83°
18
88°
82°
19
88°
83°
20
88°
83°
21
89°
82°
22
88°
83°
23
88°
83°
24
89°
80°
25
88°
82°
26
88°
82°
27
89°
83°
28
90°
81°
29
89°
82°
30
91°
80°
31
90°
81°
1
91°
80°
2
90°
79°
3
90°
80°
4
89°
78°
5
89°
81°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
August Weather in Key West
Key West's August 2026 forecast shows daily high temperatures ranging from 88° to 91°, with overnight lows between 78° and 83°. The average high for August is 89° with an average low of 82°. 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 Key West. See also: September | October | November.
