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
101°
80°
5
101°
81°
6
101°
81°
7
101°
81°
8
101°
82°
9
100°
78°
10
99°
79°
11
102°
82°
12
103°
82°
13
103°
81°
14
102°
81°
15
102°
82°
16
102°
79°
17
105°
80°
18
103°
82°
19
102°
80°
20
104°
81°
21
103°
79°
22
104°
78°
23
102°
79°
24
95°
73°
25
97°
78°
26
98°
77°
27
98°
78°
28
97°
78°
29
97°
77°
30
96°
77°
31
97°
76°
1
97°
77°
2
96°
76°
3
96°
76°
4
95°
75°
5
94°
74°
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 94° to 105°, with overnight lows between 73° and 82°. The average high for August is 100° 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.
