S
M
T
W
T
F
S
30
77°
57°
31
76°
50°
1
77°
47°
2
70°
48°
3
69°
52°
4
72°
58°
5
76°
54°
6
77°
47°
7
68°
48°
8
71°
52°
9
75°
54°
10
70°
55°
11
74°
54°
12
73°
54°
13
73°
52°
14
65°
46°
15
64°
44°
16
64°
44°
17
65°
52°
18
66°
44°
19
66°
54°
20
69°
52°
21
70°
44°
22
64°
42°
23
61°
42°
24
60°
41°
25
58°
40°
26
64°
47°
27
Hist. Avg.
62°
44°
28
Hist. Avg.
62°
44°
29
Hist. Avg.
61°
43°
30
Hist. Avg.
61°
43°
1
Hist. Avg.
61°
43°
2
Hist. Avg.
60°
42°
3
Hist. Avg.
60°
42°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in Barrhaven
Barrhaven's September 2026 forecast shows daily high temperatures ranging from 58° to 77°, with overnight lows between 40° and 58°. The average high for September is 69° with an average low of 49°. 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 Barrhaven. See also: October | November | December.
