S
M
T
W
T
F
S
30
87°
60°
31
84°
58°
1
83°
58°
2
82°
59°
3
83°
60°
4
84°
64°
5
88°
64°
6
86°
63°
7
86°
60°
8
82°
57°
9
81°
57°
10
81°
56°
11
82°
56°
12
79°
57°
13
78°
55°
14
79°
57°
15
80°
58°
16
80°
58°
17
83°
56°
18
81°
57°
19
84°
60°
20
85°
53°
21
82°
52°
22
Hist. Avg.
79°
54°
23
Hist. Avg.
79°
53°
24
Hist. Avg.
79°
53°
25
Hist. Avg.
78°
52°
26
Hist. Avg.
78°
52°
27
Hist. Avg.
78°
51°
28
Hist. Avg.
77°
51°
29
Hist. Avg.
77°
50°
30
Hist. Avg.
76°
50°
1
Hist. Avg.
76°
50°
2
Hist. Avg.
76°
49°
3
Hist. Avg.
75°
49°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in Harrisburg
Harrisburg's September 2026 forecast shows daily high temperatures ranging from 78° to 88°, with overnight lows between 52° and 64°. The average high for September is 83° with an average low of 58°. 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 Harrisburg. See also: October | November | December.
