S
M
T
W
T
F
S
27
72°
46°
28
64°
52°
29
68°
52°
30
68°
61°
1
77°
62°
2
64°
52°
3
68°
52°
4
74°
49°
5
68°
50°
6
75°
50°
7
81°
52°
8
75°
51°
9
72°
55°
10
82°
59°
11
69°
55°
12
85°
60°
13
66°
49°
14
62°
50°
15
69°
53°
16
62°
43°
17
58°
40°
18
58°
43°
19
61°
44°
20
60°
43°
21
61°
41°
22
58°
42°
23
53°
37°
24
58°
42°
25
62°
45°
26
64°
40°
27
62°
38°
28
51°
33°
29
51°
39°
30
56°
40°
31
62°
42°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
October Weather in Merrillville
Merrillville's October 2026 forecast shows daily high temperatures ranging from 51° to 85°, with overnight lows between 33° and 60°. The average high for October is 63° with an average low of 45°. AccuWeather's monthly forecast extends further ahead than any other source, with day-by-day RealFeel® Temperatures giving a complete picture of how October weather will actually feel in Merrillville. See also: November | December | January.
