S
M
T
W
T
F
S
26
N/A
27
N/A
28
N/A
29
N/A
30
N/A
1
N/A
2
N/A
3
N/A
4
N/A
5
N/A
6
N/A
7
N/A
8
N/A
9
N/A
10
N/A
11
N/A
12
N/A
13
N/A
14
N/A
15
N/A
16
N/A
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N/A
18
N/A
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N/A
20
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21
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N/A
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N/A
24
92°
74°
25
93°
74°
26
92°
75°
27
90°
74°
28
87°
73°
29
88°
75°
30
87°
75°
31
85°
74°
1
88°
73°
2
87°
73°
3
89°
74°
4
87°
75°
5
88°
76°
6
87°
74°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
May Weather in Keys
Keys's May 2026 forecast shows daily high temperatures ranging from 85° to 93°, with overnight lows between 73° and 76°. The average high for May is 89° with an average low of 74°. 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 Keys. See also: June | July | August.
