S
M
T
W
T
F
S
30
77°
58°
31
76°
55°
1
79°
55°
2
83°
62°
3
86°
58°
4
85°
52°
5
79°
49°
6
80°
53°
7
82°
58°
8
82°
54°
9
81°
47°
10
73°
46°
11
72°
45°
12
72°
49°
13
73°
53°
14
72°
44°
15
71°
42°
16
68°
42°
17
69°
44°
18
69°
43°
19
68°
42°
20
69°
43°
21
70°
47°
22
73°
51°
23
76°
50°
24
78°
52°
25
77°
50°
26
77°
41°
27
68°
50°
28
71°
46°
29
70°
45°
30
68°
47°
1
67°
44°
2
66°
46°
3
67°
48°
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 66° to 86°, with overnight lows between 41° and 62°. The average high for September is 74° 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.
