S
M
T
W
T
F
S
30
91°
72°
31
90°
71°
1
88°
71°
2
84°
70°
3
85°
67°
4
86°
67°
5
87°
68°
6
87°
68°
7
88°
67°
8
89°
68°
9
90°
69°
10
90°
68°
11
89°
61°
12
85°
68°
13
89°
61°
14
86°
62°
15
83°
61°
16
89°
64°
17
88°
66°
18
89°
66°
19
88°
62°
20
87°
59°
21
82°
61°
22
82°
62°
23
80°
62°
24
82°
64°
25
79°
63°
26
79°
63°
27
78°
60°
28
78°
58°
29
82°
56°
30
83°
57°
1
83°
60°
2
84°
54°
3
84°
52°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Old Harmony
Old Harmony's September 2026 forecast shows daily high temperatures ranging from 78° to 91°, with overnight lows between 52° and 72°. The average high for September is 85° with an average low of 64°. 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 Old Harmony. See also: October | November | December.
