S
M
T
W
T
F
S
26
89°
79°
27
90°
75°
28
88°
78°
29
88°
78°
30
89°
77°
31
88°
77°
1
89°
76°
2
90°
77°
3
89°
77°
4
88°
76°
5
89°
77°
6
89°
77°
7
90°
76°
8
90°
77°
9
89°
78°
10
91°
78°
11
90°
77°
12
89°
77°
13
89°
76°
14
88°
76°
15
88°
75°
16
89°
77°
17
88°
76°
18
88°
76°
19
89°
75°
20
88°
77°
21
88°
76°
22
89°
75°
23
89°
76°
24
91°
74°
25
90°
75°
26
89°
74°
27
90°
75°
28
89°
74°
29
90°
75°
30
89°
75°
31
92°
76°
1
92°
75°
2
91°
75°
3
91°
76°
4
90°
76°
5
91°
75°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
August Weather in Siesta Key
Siesta Key's August 2026 forecast shows daily high temperatures ranging from 88° to 92°, with overnight lows between 74° and 79°. The average high for August is 89° with an average low of 76°. 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 Siesta Key. See also: September | October | November.
