S
M
T
W
T
F
S
30
90°
64°
31
92°
71°
1
96°
73°
2
95°
72°
3
96°
73°
4
97°
74°
5
92°
74°
6
82°
64°
7
83°
60°
8
89°
64°
9
88°
71°
10
80°
63°
11
82°
68°
12
86°
65°
13
87°
64°
14
88°
70°
15
92°
65°
16
87°
64°
17
81°
59°
18
75°
53°
19
75°
48°
20
74°
51°
21
70°
50°
22
72°
53°
23
71°
49°
24
78°
54°
25
76°
54°
26
78°
54°
27
78°
55°
28
77°
54°
29
77°
55°
30
76°
53°
1
75°
48°
2
71°
52°
3
75°
53°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Greencastle
Greencastle's September 2026 forecast shows daily high temperatures ranging from 70° to 92°, with overnight lows between 48° and 70°. The average high for September is 78° 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 Greencastle. See also: October | November | December.
