S
M
T
W
T
F
S
27
76°
55°
28
77°
53°
29
76°
53°
30
74°
54°
1
75°
53°
2
76°
45°
3
75°
42°
4
64°
41°
5
63°
43°
6
64°
47°
7
67°
50°
8
70°
43°
9
70°
40°
10
70°
49°
11
69°
46°
12
Hist. Avg.
65°
43°
13
Hist. Avg.
65°
43°
14
Hist. Avg.
65°
43°
15
Hist. Avg.
64°
42°
16
Hist. Avg.
64°
42°
17
Hist. Avg.
63°
42°
18
Hist. Avg.
63°
41°
19
Hist. Avg.
62°
41°
20
Hist. Avg.
62°
41°
21
Hist. Avg.
61°
40°
22
Hist. Avg.
61°
40°
23
Hist. Avg.
60°
39°
24
Hist. Avg.
60°
39°
25
Hist. Avg.
59°
39°
26
Hist. Avg.
59°
38°
27
Hist. Avg.
58°
38°
28
Hist. Avg.
57°
38°
29
Hist. Avg.
57°
37°
30
Hist. Avg.
56°
37°
31
Hist. Avg.
56°
36°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
October Weather in Merrillville
Merrillville's October 2026 forecast shows daily high temperatures ranging from 63° to 77°, with overnight lows between 40° and 55°. The average high for October is 71° with an average low of 48°. 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.
