S
M
T
W
T
F
S
30
100°
70°
31
98°
73°
1
98°
76°
2
100°
74°
3
100°
73°
4
97°
72°
5
99°
75°
6
100°
74°
7
102°
73°
8
101°
72°
9
95°
71°
10
94°
72°
11
92°
72°
12
91°
71°
13
93°
72°
14
94°
73°
15
93°
73°
16
92°
73°
17
91°
69°
18
91°
69°
19
88°
63°
20
84°
65°
21
86°
64°
22
86°
63°
23
90°
68°
24
90°
68°
25
88°
67°
26
87°
67°
27
88°
66°
28
88°
66°
29
87°
65°
30
87°
66°
1
86°
66°
2
86°
64°
3
87°
65°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Harrisonburg
Harrisonburg's September 2026 forecast shows daily high temperatures ranging from 84° to 95°, with overnight lows between 63° and 73°. The average high for September is 89° with an average low of 68°. 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 Harrisonburg. See also: October | November | December.
