S
M
T
W
T
F
S
30
79°
58°
31
82°
61°
1
85°
56°
2
82°
55°
3
78°
56°
4
79°
57°
5
80°
63°
6
84°
62°
7
85°
62°
8
79°
61°
9
77°
62°
10
82°
61°
11
82°
58°
12
81°
61°
13
78°
58°
14
76°
53°
15
75°
53°
16
74°
52°
17
74°
53°
18
75°
56°
19
79°
58°
20
78°
59°
21
79°
55°
22
75°
51°
23
73°
56°
24
72°
57°
25
78°
50°
26
77°
48°
27
Hist. Avg.
74°
51°
28
Hist. Avg.
74°
51°
29
Hist. Avg.
73°
50°
30
Hist. Avg.
73°
50°
1
Hist. Avg.
72°
50°
2
Hist. Avg.
72°
49°
3
Hist. Avg.
71°
49°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in Washington Boro
Washington Boro's September 2026 forecast shows daily high temperatures ranging from 72° to 85°, with overnight lows between 48° and 63°. The average high for September is 79° with an average low of 57°. 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 Washington Boro. See also: October | November | December.
