S
M
T
W
T
F
S
30
79°
55°
31
N/A
1
83°
67°
2
74°
68°
3
84°
66°
4
84°
64°
5
78°
57°
6
75°
55°
7
78°
58°
8
77°
57°
9
79°
58°
10
81°
58°
11
79°
57°
12
77°
58°
13
78°
56°
14
76°
54°
15
72°
54°
16
72°
58°
17
74°
51°
18
70°
49°
19
70°
49°
20
71°
52°
21
74°
56°
22
78°
57°
23
79°
56°
24
78°
54°
25
76°
51°
26
76°
53°
27
77°
54°
28
76°
54°
29
75°
51°
30
69°
46°
1
65°
45°
2
68°
49°
3
73°
52°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Morristown
Morristown's September 2026 forecast shows daily high temperatures ranging from 65° to 84°, with overnight lows between 45° and 68°. 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 Morristown. See also: October | November | December.
