S
M
T
W
T
F
S
27
59°
56°
28
57°
54°
29
66°
55°
30
71°
56°
1
74°
54°
2
84°
62°
3
70°
43°
4
66°
37°
5
69°
38°
6
61°
35°
7
66°
28°
8
71°
45°
9
67°
40°
10
62°
33°
11
55°
34°
12
72°
49°
13
59°
48°
14
76°
48°
15
62°
36°
16
68°
41°
17
58°
27°
18
58°
24°
19
63°
27°
20
68°
29°
21
60°
31°
22
67°
33°
23
59°
28°
24
64°
24°
25
68°
23°
26
73°
25°
27
56°
27°
28
54°
39°
29
68°
52°
30
71°
39°
31
57°
28°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
October Weather in Merrimack
Merrimack's October 2026 forecast shows daily high temperatures ranging from 54° to 71°, with overnight lows between 27° and 52°. The average high for October is 61° with an average low of 37°. 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 Merrimack. See also: November | December | January.
