S
M
T
W
T
F
S
30
86°
58°
31
78°
56°
1
78°
63°
2
79°
61°
3
79°
58°
4
82°
64°
5
85°
63°
6
85°
56°
7
80°
56°
8
76°
55°
9
76°
55°
10
77°
59°
11
82°
55°
12
75°
55°
13
73°
54°
14
74°
60°
15
79°
61°
16
81°
52°
17
80°
51°
18
72°
50°
19
71°
52°
20
71°
57°
21
70°
55°
22
70°
51°
23
69°
53°
24
70°
52°
25
72°
56°
26
75°
57°
27
76°
49°
28
76°
48°
29
68°
54°
30
69°
55°
1
68°
56°
2
70°
53°
3
73°
47°
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 86°, with overnight lows between 47° and 64°. The average high for September is 76° with an average low of 55°. 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.
