S
M
T
W
T
F
S
30
85°
60°
31
86°
60°
1
87°
59°
2
84°
54°
3
75°
59°
4
78°
60°
5
83°
57°
6
84°
48°
7
76°
47°
8
73°
51°
9
74°
54°
10
73°
57°
11
74°
56°
12
78°
53°
13
82°
46°
14
73°
45°
15
70°
44°
16
69°
46°
17
69°
45°
18
71°
43°
19
78°
42°
20
69°
45°
21
70°
52°
22
74°
51°
23
79°
52°
24
78°
53°
25
78°
52°
26
79°
52°
27
80°
50°
28
76°
46°
29
71°
47°
30
67°
47°
1
73°
45°
2
74°
50°
3
63°
37°
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 63° to 87°, with overnight lows between 37° and 60°. The average high for September is 76° with an average low of 50°. 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.
