S
M
T
W
T
F
S
30
75°
57°
31
72°
63°
1
71°
64°
2
72°
64°
3
81°
63°
4
77°
59°
5
74°
57°
6
73°
52°
7
76°
47°
8
77°
50°
9
72°
62°
10
76°
61°
11
71°
49°
12
78°
46°
13
81°
63°
14
66°
48°
15
69°
43°
16
77°
57°
17
71°
63°
18
73°
53°
19
64°
44°
20
60°
45°
21
64°
45°
22
64°
43°
23
65°
43°
24
65°
46°
25
67°
44°
26
70°
45°
27
68°
47°
28
68°
47°
29
69°
46°
30
71°
49°
1
67°
47°
2
69°
44°
3
61°
48°
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 60° to 71°, with overnight lows between 43° and 49°. The average high for September is 66° with an average low of 46°. 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.
