S
M
T
W
T
F
S
30
82°
55°
31
82°
56°
1
68°
61°
2
73°
63°
3
77°
62°
4
85°
64°
5
78°
61°
6
74°
51°
7
82°
47°
8
76°
54°
9
75°
66°
10
85°
57°
11
76°
45°
12
76°
56°
13
78°
60°
14
79°
54°
15
74°
60°
16
73°
54°
17
72°
53°
18
68°
51°
19
67°
46°
20
66°
47°
21
70°
49°
22
65°
53°
23
65°
52°
24
69°
52°
25
68°
51°
26
71°
51°
27
65°
48°
28
66°
50°
29
71°
51°
30
71°
51°
1
70°
50°
2
69°
51°
3
67°
49°
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 85°, with overnight lows between 45° and 66°. The average high for September is 71° with an average low of 52°. 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.
