S
M
T
W
T
F
S
30
76°
53°
31
76°
52°
1
75°
53°
2
76°
57°
3
75°
58°
4
76°
53°
5
77°
51°
6
76°
52°
7
74°
50°
8
75°
51°
9
74°
57°
10
74°
52°
11
75°
49°
12
73°
50°
13
74°
50°
14
76°
54°
15
77°
55°
16
79°
55°
17
79°
54°
18
77°
48°
19
77°
53°
20
76°
47°
21
70°
49°
22
70°
52°
23
76°
52°
24
75°
53°
25
76°
51°
26
75°
44°
27
71°
44°
28
67°
45°
29
66°
45°
30
66°
43°
1
65°
48°
2
Hist. Avg.
69°
46°
3
Hist. Avg.
68°
45°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Derry
Derry's September 2026 forecast shows daily high temperatures ranging from 65° to 79°, with overnight lows between 43° and 58°. The average high for September is 74° with an average low of 51°. 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 Derry. See also: October | November | December.
