S
M
T
W
T
F
S
30
81°
62°
31
81°
66°
1
85°
66°
2
81°
57°
3
80°
55°
4
77°
56°
5
78°
56°
6
80°
57°
7
82°
58°
8
84°
63°
9
85°
63°
10
83°
55°
11
79°
58°
12
80°
61°
13
80°
54°
14
78°
53°
15
75°
51°
16
77°
53°
17
76°
56°
18
79°
57°
19
81°
59°
20
81°
59°
21
83°
58°
22
81°
59°
23
81°
59°
24
76°
58°
25
79°
58°
26
81°
57°
27
82°
57°
28
82°
56°
29
81°
56°
30
82°
55°
1
81°
57°
2
81°
47°
3
80°
46°
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 75° to 85°, with overnight lows between 46° and 66°. The average high for September is 80° with an average low of 57°. 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.
