S
M
T
W
T
F
S
26
82°
52°
27
87°
54°
28
81°
61°
29
71°
62°
30
77°
63°
31
79°
55°
1
82°
64°
2
78°
67°
3
77°
60°
4
80°
62°
5
79°
63°
6
78°
62°
7
83°
61°
8
81°
59°
9
79°
60°
10
77°
58°
11
76°
55°
12
75°
55°
13
76°
53°
14
79°
55°
15
73°
50°
16
71°
49°
17
72°
55°
18
72°
55°
19
71°
50°
20
71°
49°
21
72°
54°
22
71°
54°
23
71°
51°
24
70°
49°
25
71°
48°
26
70°
48°
27
69°
47°
28
69°
46°
29
68°
47°
30
69°
46°
31
73°
53°
1
72°
55°
2
74°
54°
3
70°
49°
4
68°
46°
5
67°
44°
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 67° to 83°, with overnight lows between 44° and 67°. The average high for August is 74° with an average low of 54°. 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.
