S
M
T
W
T
F
S
26
87°
79°
27
85°
75°
28
86°
77°
29
85°
79°
30
85°
78°
1
87°
77°
2
87°
82°
3
86°
79°
4
86°
77°
5
90°
77°
6
86°
76°
7
89°
82°
8
92°
82°
9
89°
83°
10
90°
84°
11
89°
84°
12
89°
83°
13
90°
83°
14
89°
81°
15
90°
79°
16
90°
81°
17
89°
81°
18
89°
83°
19
88°
80°
20
87°
78°
21
88°
79°
22
89°
81°
23
89°
84°
24
89°
80°
25
89°
83°
26
88°
81°
27
87°
82°
28
87°
80°
29
88°
81°
30
85°
80°
31
88°
82°
1
87°
81°
2
88°
78°
3
87°
80°
4
88°
81°
5
89°
80°
6
88°
83°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
May Weather in Key West
Key West's May 2026 forecast shows daily high temperatures ranging from 85° to 89°, with overnight lows between 78° and 83°. The average high for May is 88° with an average low of 81°. AccuWeather's monthly forecast extends further ahead than any other source, with day-by-day RealFeel® Temperatures giving a complete picture of how May weather will actually feel in Key West. See also: June | July | August.
