S
M
T
W
T
F
S
30
76°
51°
31
72°
49°
1
70°
49°
2
70°
50°
3
71°
48°
4
71°
52°
5
76°
57°
6
78°
57°
7
77°
54°
8
78°
52°
9
74°
56°
10
77°
55°
11
79°
54°
12
75°
55°
13
78°
57°
14
75°
47°
15
78°
42°
16
67°
41°
17
66°
42°
18
67°
48°
19
67°
45°
20
68°
52°
21
73°
52°
22
67°
50°
23
73°
52°
24
74°
52°
25
73°
51°
26
75°
52°
27
75°
43°
28
74°
38°
29
69°
38°
30
62°
43°
1
61°
39°
2
62°
44°
3
61°
43°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Herkimer
Herkimer's September 2026 forecast shows daily high temperatures ranging from 61° to 79°, with overnight lows between 38° and 57°. The average high for September is 72° 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 Herkimer. See also: October | November | December.
