S
M
T
W
T
F
S
26
105°
82°
27
103°
82°
28
105°
81°
29
106°
81°
30
106°
82°
31
106°
82°
1
105°
81°
2
107°
83°
3
107°
82°
4
106°
82°
5
105°
82°
6
104°
81°
7
104°
81°
8
105°
82°
9
106°
82°
10
106°
81°
11
105°
81°
12
99°
80°
13
99°
80°
14
100°
76°
15
100°
77°
16
103°
76°
17
105°
78°
18
103°
77°
19
101°
78°
20
104°
79°
21
104°
82°
22
105°
81°
23
107°
80°
24
105°
80°
25
106°
79°
26
105°
79°
27
105°
77°
28
104°
75°
29
105°
74°
30
104°
73°
31
102°
72°
1
103°
75°
2
104°
79°
3
105°
74°
4
105°
72°
5
103°
73°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
August Weather in San Tan Valley
San Tan Valley's August 2026 forecast shows daily high temperatures ranging from 99° to 107°, with overnight lows between 72° and 83°. The average high for August is 104° with an average low of 79°. 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 San Tan Valley. See also: September | October | November.
