S
M
T
W
T
F
S
26
83°
67°
27
89°
64°
28
82°
68°
29
79°
34°
30
82°
54°
31
86°
63°
1
77°
68°
2
79°
68°
3
83°
65°
4
84°
55°
5
84°
66°
6
86°
66°
7
84°
66°
8
86°
68°
9
86°
66°
10
88°
68°
11
75°
64°
12
70°
63°
13
86°
63°
14
84°
70°
15
82°
68°
16
88°
72°
17
84°
72°
18
82°
59°
19
81°
66°
20
79°
60°
21
85°
62°
22
82°
61°
23
77°
54°
24
76°
56°
25
78°
59°
26
77°
58°
27
79°
58°
28
80°
59°
29
81°
59°
30
81°
58°
31
80°
59°
1
83°
62°
2
83°
61°
3
77°
57°
4
75°
53°
5
76°
55°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
August Weather in Londonderry
Londonderry's August 2026 forecast shows daily high temperatures ranging from 75° to 85°, with overnight lows between 53° and 66°. The average high for August is 80° with an average low of 59°. AccuWeather's monthly forecast extends further ahead than any other source, with day-by-day RealFeel® Temperatures giving a complete picture of how August weather will actually feel in Londonderry. See also: September | October | November.
