S
M
T
W
T
F
S
28
92°
81°
29
93°
83°
30
94°
79°
1
88°
80°
2
87°
82°
3
86°
82°
4
87°
81°
5
86°
82°
6
87°
81°
7
88°
83°
8
89°
81°
9
87°
82°
10
87°
82°
11
88°
84°
12
90°
83°
13
90°
84°
14
89°
81°
15
92°
81°
16
92°
80°
17
92°
81°
18
91°
81°
19
92°
80°
20
89°
81°
21
89°
80°
22
90°
80°
23
89°
79°
24
89°
80°
25
90°
80°
26
90°
81°
27
91°
80°
28
91°
81°
29
92°
80°
30
90°
82°
31
90°
82°
1
92°
81°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
July Weather in Key Biscayne
Key Biscayne's July 2026 forecast shows daily high temperatures ranging from 86° to 92°, with overnight lows between 79° and 84°. The average high for July is 89° 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 July weather will actually feel in Key Biscayne. See also: August | September | October.
