S
M
T
W
T
F
S
26
86°
66°
27
80°
61°
28
81°
62°
29
83°
66°
30
82°
60°
31
83°
66°
1
84°
62°
2
82°
59°
3
81°
60°
4
79°
58°
5
80°
59°
6
80°
59°
7
81°
60°
8
82°
59°
9
85°
64°
10
81°
65°
11
83°
65°
12
86°
66°
13
86°
66°
14
85°
64°
15
86°
58°
16
84°
59°
17
80°
61°
18
79°
61°
19
79°
57°
20
78°
56°
21
78°
57°
22
79°
58°
23
84°
63°
24
85°
64°
25
84°
57°
26
85°
56°
27
78°
55°
28
78°
55°
29
77°
62°
30
81°
63°
31
83°
63°
1
84°
57°
2
81°
56°
3
82°
61°
4
79°
61°
5
79°
60°
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 77° to 86°, with overnight lows between 55° and 66°. The average high for August is 82° 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 Merrillville. See also: September | October | November.
