S
M
T
W
T
F
S
30
84°
63°
31
82°
66°
1
88°
72°
2
91°
73°
3
88°
68°
4
81°
68°
5
77°
61°
6
77°
57°
7
79°
54°
8
83°
63°
9
86°
69°
10
74°
60°
11
77°
54°
12
79°
62°
13
83°
61°
14
78°
59°
15
77°
58°
16
76°
56°
17
75°
57°
18
77°
56°
19
73°
54°
20
70°
50°
21
77°
56°
22
75°
55°
23
72°
54°
24
75°
54°
25
76°
53°
26
77°
54°
27
75°
53°
28
76°
54°
29
76°
54°
30
77°
53°
1
76°
53°
2
74°
51°
3
73°
46°
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 70° to 86°, with overnight lows between 46° and 69°. The average high for September is 77° with an average low of 56°. 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.
