S
M
T
W
T
F
S
30
85°
57°
31
81°
54°
1
79°
53°
2
78°
54°
3
78°
55°
4
79°
55°
5
77°
56°
6
76°
59°
7
77°
60°
8
82°
55°
9
76°
53°
10
76°
53°
11
75°
52°
12
76°
54°
13
75°
55°
14
74°
52°
15
75°
57°
16
75°
52°
17
76°
51°
18
75°
51°
19
Hist. Avg.
75°
52°
20
Hist. Avg.
75°
52°
21
Hist. Avg.
75°
52°
22
Hist. Avg.
74°
51°
23
Hist. Avg.
74°
51°
24
Hist. Avg.
74°
50°
25
Hist. Avg.
73°
50°
26
Hist. Avg.
73°
50°
27
Hist. Avg.
72°
49°
28
Hist. Avg.
72°
49°
29
Hist. Avg.
72°
49°
30
Hist. Avg.
71°
48°
1
Hist. Avg.
71°
48°
2
Hist. Avg.
70°
48°
3
Hist. Avg.
70°
47°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in Old Washington
Old Washington's September 2026 forecast shows daily high temperatures ranging from 74° to 85°, with overnight lows between 51° and 60°. The average high for September is 77° with an average low of 54°. 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 Old Washington. See also: October | November | December.
