S
M
T
W
T
F
S
26
99°
79°
27
100°
80°
28
100°
80°
29
99°
81°
30
101°
81°
31
103°
82°
1
98°
80°
2
96°
73°
3
101°
74°
4
102°
79°
5
101°
81°
6
102°
80°
7
100°
80°
8
100°
78°
9
99°
79°
10
98°
78°
11
97°
77°
12
100°
78°
13
101°
79°
14
102°
79°
15
100°
80°
16
101°
79°
17
96°
74°
18
98°
77°
19
98°
78°
20
99°
79°
21
99°
78°
22
98°
78°
23
98°
77°
24
97°
78°
25
98°
78°
26
98°
77°
27
97°
78°
28
98°
78°
29
97°
77°
30
98°
78°
31
98°
76°
1
96°
75°
2
95°
76°
3
96°
76°
4
96°
75°
5
95°
76°
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 95° to 102°, with overnight lows between 74° and 81°. The average high for August is 98° with an average low of 78°. 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.
