S
M
T
W
T
F
S
30
80°
64°
31
87°
69°
1
93°
73°
2
93°
71°
3
90°
71°
4
90°
72°
5
83°
68°
6
82°
60°
7
82°
57°
8
84°
60°
9
78°
69°
10
78°
57°
11
81°
60°
12
81°
55°
13
69°
49°
14
67°
63°
15
79°
63°
16
74°
59°
17
77°
57°
18
70°
53°
19
68°
49°
20
70°
49°
21
72°
52°
22
73°
53°
23
75°
51°
24
72°
48°
25
72°
54°
26
77°
55°
27
76°
54°
28
76°
54°
29
73°
52°
30
74°
50°
1
71°
47°
2
67°
51°
3
71°
51°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Marengo
Marengo's September 2026 forecast shows daily high temperatures ranging from 67° to 81°, with overnight lows between 47° and 63°. The average high for September is 73° with an average low of 53°. 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 Marengo. See also: October | November | December.
