S
M
T
W
T
F
S
30
79°
60°
31
83°
64°
1
84°
64°
2
85°
65°
3
85°
58°
4
81°
55°
5
77°
56°
6
77°
60°
7
81°
62°
8
82°
61°
9
80°
62°
10
76°
61°
11
81°
60°
12
80°
62°
13
81°
62°
14
80°
61°
15
82°
61°
16
82°
60°
17
79°
60°
18
80°
53°
19
76°
52°
20
73°
51°
21
70°
49°
22
71°
54°
23
72°
52°
24
74°
49°
25
69°
49°
26
70°
50°
27
71°
49°
28
75°
54°
29
74°
55°
30
76°
55°
1
71°
54°
2
72°
48°
3
68°
53°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Mount Joy
Mount Joy's September 2026 forecast shows daily high temperatures ranging from 68° to 85°, with overnight lows between 48° and 65°. The average high for September is 77° 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 Mount Joy. See also: October | November | December.
