S
M
T
W
T
F
S
30
89°
62°
31
83°
61°
1
81°
66°
2
81°
65°
3
85°
62°
4
86°
67°
5
87°
67°
6
88°
60°
7
85°
60°
8
79°
59°
9
79°
60°
10
81°
63°
11
84°
60°
12
82°
59°
13
76°
58°
14
77°
64°
15
81°
65°
16
84°
57°
17
83°
56°
18
75°
54°
19
74°
56°
20
75°
61°
21
73°
61°
22
74°
55°
23
73°
58°
24
73°
57°
25
75°
60°
26
76°
60°
27
79°
54°
28
79°
52°
29
72°
58°
30
72°
58°
1
71°
59°
2
74°
56°
3
75°
51°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Fort Washington
Fort Washington's September 2026 forecast shows daily high temperatures ranging from 71° to 89°, with overnight lows between 51° and 67°. 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 Fort Washington. See also: October | November | December.
