S
M
T
W
T
F
S
30
79°
57°
31
74°
52°
1
72°
54°
2
72°
52°
3
73°
52°
4
72°
54°
5
73°
58°
6
74°
59°
7
77°
56°
8
79°
55°
9
78°
56°
10
73°
58°
11
79°
57°
12
78°
55°
13
77°
57°
14
77°
55°
15
79°
47°
16
75°
46°
17
68°
45°
18
68°
51°
19
71°
51°
20
71°
53°
21
73°
53°
22
70°
52°
23
73°
53°
24
74°
52°
25
70°
53°
26
74°
53°
27
74°
44°
28
73°
41°
29
72°
41°
30
60°
45°
1
61°
40°
2
64°
46°
3
62°
47°
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 60° to 79°, with overnight lows between 40° and 59°. The average high for September is 73° 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.
