S
M
T
W
T
F
S
26
83°
69°
27
81°
70°
28
80°
70°
29
81°
70°
30
83°
69°
31
84°
70°
1
90°
68°
2
90°
67°
3
88°
67°
4
84°
66°
5
86°
68°
6
87°
69°
7
86°
67°
8
87°
68°
9
85°
67°
10
85°
69°
11
84°
67°
12
83°
69°
13
84°
66°
14
83°
65°
15
83°
68°
16
85°
67°
17
82°
65°
18
83°
67°
19
85°
68°
20
86°
67°
21
86°
67°
22
87°
68°
23
87°
69°
24
88°
69°
25
88°
68°
26
87°
68°
27
87°
69°
28
86°
69°
29
86°
68°
30
87°
69°
31
87°
69°
1
86°
68°
2
87°
68°
3
85°
67°
4
84°
68°
5
83°
68°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
August Weather in Tustin
Tustin's August 2026 forecast shows daily high temperatures ranging from 82° to 90°, with overnight lows between 65° and 69°. The average high for August is 86° with an average low of 68°. 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 Tustin. See also: September | October | November.
