S
M
T
W
T
F
S
30
79°
56°
31
78°
62°
1
80°
62°
2
79°
55°
3
78°
54°
4
77°
61°
5
77°
62°
6
84°
61°
7
85°
62°
8
84°
60°
9
84°
59°
10
77°
60°
11
77°
59°
12
81°
61°
13
83°
58°
14
74°
50°
15
72°
49°
16
Hist. Avg.
76°
55°
17
Hist. Avg.
76°
54°
18
Hist. Avg.
76°
54°
19
Hist. Avg.
75°
53°
20
Hist. Avg.
75°
53°
21
Hist. Avg.
74°
52°
22
Hist. Avg.
74°
52°
23
Hist. Avg.
74°
52°
24
Hist. Avg.
73°
51°
25
Hist. Avg.
73°
51°
26
Hist. Avg.
72°
50°
27
Hist. Avg.
72°
50°
28
Hist. Avg.
72°
50°
29
Hist. Avg.
71°
49°
30
Hist. Avg.
71°
49°
1
Hist. Avg.
70°
48°
2
Hist. Avg.
70°
48°
3
Hist. Avg.
69°
48°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in Monmouth
Monmouth's September 2026 forecast shows daily high temperatures ranging from 72° to 85°, with overnight lows between 49° and 62°. The average high for September is 79° with an average low of 58°. 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 Monmouth. See also: October | November | December.
