S
M
T
W
T
F
S
30
87°
65°
31
81°
66°
1
85°
66°
2
84°
65°
3
85°
66°
4
85°
65°
5
84°
64°
6
84°
62°
7
83°
64°
8
84°
64°
9
84°
63°
10
83°
63°
11
82°
61°
12
84°
62°
13
84°
62°
14
83°
61°
15
83°
63°
16
81°
62°
17
82°
63°
18
82°
61°
19
78°
54°
20
76°
59°
21
75°
62°
22
78°
53°
23
74°
52°
24
73°
53°
25
73°
57°
26
76°
58°
27
71°
53°
28
71°
52°
29
72°
51°
30
71°
56°
1
71°
58°
2
73°
49°
3
71°
47°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Falls Church
Falls Church's September 2026 forecast shows daily high temperatures ranging from 71° to 87°, with overnight lows between 47° and 66°. The average high for September is 79° with an average low of 59°. 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 Falls Church. See also: October | November | December.
