S
M
T
W
T
F
S
30
63°
50°
31
62°
49°
1
64°
50°
2
66°
51°
3
66°
53°
4
65°
49°
5
65°
48°
6
63°
51°
7
65°
49°
8
66°
48°
9
66°
52°
10
65°
53°
11
66°
52°
12
65°
47°
13
62°
47°
14
61°
50°
15
60°
51°
16
59°
52°
17
62°
49°
18
63°
48°
19
59°
52°
20
63°
51°
21
64°
49°
22
62°
46°
23
58°
45°
24
58°
48°
25
59°
49°
26
59°
47°
27
58°
49°
28
57°
51°
29
59°
50°
30
59°
49°
1
60°
50°
2
60°
46°
3
60°
48°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Defynnog
Defynnog's September 2026 forecast shows daily high temperatures ranging from 57° to 66°, with overnight lows between 45° and 53°. The average high for September is 62° 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 Defynnog. See also: October | November | December.
