S
M
T
W
T
F
S
30
75°
60°
31
78°
60°
1
81°
59°
2
81°
60°
3
78°
59°
4
74°
56°
5
73°
54°
6
79°
50°
7
71°
55°
8
75°
57°
9
78°
58°
10
80°
56°
11
80°
48°
12
77°
53°
13
71°
53°
14
69°
57°
15
75°
56°
16
78°
56°
17
78°
55°
18
75°
55°
19
73°
54°
20
77°
48°
21
75°
43°
22
65°
52°
23
66°
46°
24
70°
52°
25
70°
53°
26
75°
46°
27
74°
42°
28
64°
40°
29
63°
45°
30
64°
46°
1
62°
42°
2
62°
45°
3
63°
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 62° to 81°, with overnight lows between 40° and 60°. The average high for September is 73° 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.
