S
M
T
W
T
F
S
30
90°
59°
31
81°
60°
1
81°
62°
2
88°
66°
3
89°
67°
4
89°
67°
5
90°
63°
6
88°
57°
7
80°
56°
8
80°
57°
9
79°
63°
10
83°
63°
11
84°
57°
12
78°
56°
13
77°
59°
14
80°
63°
15
83°
53°
16
86°
53°
17
75°
52°
18
75°
52°
19
76°
53°
20
74°
52°
21
73°
51°
22
74°
50°
23
75°
50°
24
76°
54°
25
78°
57°
26
81°
57°
27
81°
54°
28
73°
58°
29
80°
51°
30
80°
48°
1
72°
52°
2
73°
47°
3
70°
50°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Herculaneum
Herculaneum's September 2026 forecast shows daily high temperatures ranging from 70° to 90°, with overnight lows between 47° and 67°. The average high for September is 80° with an average low of 56°. 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 Herculaneum. See also: October | November | December.
