S
M
T
W
T
F
S
26
88°
69°
27
82°
67°
28
83°
63°
29
77°
60°
30
76°
60°
31
79°
65°
1
82°
67°
2
84°
67°
3
83°
66°
4
84°
66°
5
79°
65°
6
80°
67°
7
85°
67°
8
77°
66°
9
84°
65°
10
76°
62°
11
78°
64°
12
80°
66°
13
83°
63°
14
79°
59°
15
75°
59°
16
77°
62°
17
76°
64°
18
80°
65°
19
82°
62°
20
83°
65°
21
84°
61°
22
75°
58°
23
81°
64°
24
76°
63°
25
83°
62°
26
83°
64°
27
82°
56°
28
75°
55°
29
72°
53°
30
74°
56°
31
75°
61°
1
74°
63°
2
79°
55°
3
74°
52°
4
72°
53°
5
70°
52°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
August Weather in Round Lake
Round Lake's August 2026 forecast shows daily high temperatures ranging from 70° to 88°, with overnight lows between 52° and 69°. The average high for August is 79° with an average low of 62°. 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 Round Lake. See also: September | October | November.
