S
M
T
W
T
F
S
26
84°
57°
27
84°
67°
28
80°
68°
29
82°
66°
30
79°
67°
31
87°
66°
1
88°
69°
2
87°
70°
3
81°
71°
4
83°
69°
5
85°
67°
6
88°
65°
7
87°
64°
8
88°
61°
9
89°
65°
10
88°
61°
11
89°
62°
12
86°
62°
13
87°
61°
14
89°
61°
15
85°
58°
16
82°
57°
17
82°
61°
18
83°
60°
19
82°
58°
20
81°
57°
21
82°
63°
22
87°
62°
23
83°
57°
24
81°
57°
25
81°
58°
26
82°
57°
27
81°
56°
28
81°
57°
29
82°
56°
30
83°
60°
31
87°
64°
1
87°
64°
2
84°
63°
3
80°
59°
4
80°
55°
5
79°
55°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
August Weather in Rosemont
Rosemont's August 2026 forecast shows daily high temperatures ranging from 79° to 89°, with overnight lows between 55° and 71°. The average high for August is 84° with an average low of 61°. 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 Rosemont. See also: September | October | November.
