S
M
T
W
T
F
S
30
76°
65°
31
89°
69°
1
90°
62°
2
86°
64°
3
82°
64°
4
82°
63°
5
81°
53°
6
80°
55°
7
75°
62°
8
78°
59°
9
78°
51°
10
74°
51°
11
77°
55°
12
78°
52°
13
78°
53°
14
74°
48°
15
75°
49°
16
75°
50°
17
69°
46°
18
71°
49°
19
73°
52°
20
72°
51°
21
72°
51°
22
72°
49°
23
69°
50°
24
71°
50°
25
68°
48°
26
63°
43°
27
59°
39°
28
57°
36°
29
58°
37°
30
57°
35°
1
56°
44°
2
57°
45°
3
60°
43°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Merrill
Merrill's September 2026 forecast shows daily high temperatures ranging from 56° to 82°, with overnight lows between 35° and 63°. The average high for September is 70° with an average low of 49°. AccuWeather's monthly forecast extends further ahead than any other source, with day-by-day RealFeel® Temperatures giving a complete picture of how September weather will actually feel in Merrill. See also: October | November | December.
