S
M
T
W
T
F
S
26
84°
65°
27
87°
70°
28
87°
71°
29
87°
67°
30
85°
62°
31
86°
64°
1
84°
67°
2
80°
71°
3
86°
71°
4
83°
73°
5
87°
71°
6
88°
71°
7
88°
70°
8
89°
72°
9
91°
69°
10
91°
69°
11
92°
70°
12
92°
71°
13
94°
73°
14
92°
73°
15
90°
70°
16
90°
70°
17
90°
66°
18
87°
65°
19
88°
67°
20
86°
65°
21
86°
65°
22
88°
67°
23
89°
64°
24
82°
61°
25
86°
65°
26
88°
67°
27
88°
67°
28
87°
66°
29
89°
67°
30
85°
65°
31
80°
64°
1
80°
66°
2
81°
65°
3
83°
65°
4
85°
64°
5
86°
65°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
August Weather in Lewisville
Lewisville's August 2026 forecast shows daily high temperatures ranging from 80° to 94°, with overnight lows between 61° and 73°. The average high for August is 87° with an average low of 67°. 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 Lewisville. See also: September | October | November.
