S
M
T
W
T
F
S
26
84°
74°
27
83°
74°
28
83°
74°
29
83°
75°
30
83°
73°
1
83°
74°
2
85°
80°
3
84°
73°
4
83°
72°
5
86°
74°
6
84°
75°
7
85°
79°
8
87°
78°
9
86°
80°
10
86°
81°
11
86°
79°
12
86°
79°
13
87°
74°
14
86°
77°
15
86°
78°
16
87°
76°
17
86°
78°
18
87°
80°
19
84°
76°
20
86°
74°
21
86°
78°
22
86°
78°
23
87°
80°
24
86°
81°
25
87°
79°
26
86°
82°
27
87°
78°
28
86°
80°
29
86°
79°
30
86°
80°
31
88°
81°
1
88°
79°
2
87°
78°
3
87°
78°
4
87°
80°
5
86°
81°
6
88°
80°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
May Weather in Middle Keys
Middle Keys's May 2026 forecast shows daily high temperatures ranging from 86° to 88°, with overnight lows between 78° and 81°. The average high for May is 87° with an average low of 80°. 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 Middle Keys. See also: June | July | August.
