S
M
T
W
T
F
S
26
85°
70°
27
86°
70°
28
89°
69°
29
87°
70°
30
89°
70°
31
88°
69°
1
89°
69°
2
88°
70°
3
89°
71°
4
91°
70°
5
89°
70°
6
86°
69°
7
89°
70°
8
89°
66°
9
83°
63°
10
82°
63°
11
83°
66°
12
83°
69°
13
84°
69°
14
86°
68°
15
88°
69°
16
85°
67°
17
88°
61°
18
83°
61°
19
84°
66°
20
88°
67°
21
89°
68°
22
88°
67°
23
89°
68°
24
88°
66°
25
86°
65°
26
81°
63°
27
81°
61°
28
80°
61°
29
81°
62°
30
81°
62°
31
84°
66°
1
87°
66°
2
87°
65°
3
86°
61°
4
86°
57°
5
79°
58°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
August Weather in Chantilly
Chantilly's August 2026 forecast shows daily high temperatures ranging from 79° to 91°, with overnight lows between 57° and 71°. The average high for August is 86° with an average low of 66°. 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 Chantilly. See also: September | October | November.
