S
M
T
W
T
F
S
26
82°
64°
27
80°
63°
28
86°
62°
29
79°
60°
30
78°
61°
31
83°
66°
1
80°
64°
2
80°
66°
3
84°
67°
4
87°
66°
5
83°
65°
6
84°
65°
7
80°
61°
8
79°
64°
9
80°
64°
10
79°
60°
11
78°
59°
12
79°
63°
13
85°
67°
14
86°
66°
15
83°
66°
16
81°
65°
17
84°
66°
18
84°
66°
19
82°
65°
20
78°
64°
21
78°
64°
22
79°
63°
23
78°
64°
24
77°
64°
25
77°
63°
26
80°
64°
27
78°
63°
28
85°
59°
29
79°
58°
30
76°
57°
31
80°
58°
1
83°
59°
2
82°
61°
3
84°
62°
4
81°
55°
5
81°
54°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
August Weather in Merrillville
Merrillville's August 2026 forecast shows daily high temperatures ranging from 76° to 87°, with overnight lows between 54° and 67°. The average high for August is 81° with an average low of 63°. 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 Merrillville. See also: September | October | November.
