S
M
T
W
T
F
S
26
71°
53°
27
69°
53°
28
70°
57°
29
67°
56°
30
67°
53°
31
66°
52°
1
67°
52°
2
66°
51°
3
67°
53°
4
70°
57°
5
70°
56°
6
68°
53°
7
66°
54°
8
67°
52°
9
66°
56°
10
66°
54°
11
70°
56°
12
71°
56°
13
71°
55°
14
70°
56°
15
66°
56°
16
70°
54°
17
68°
54°
18
67°
51°
19
66°
50°
20
66°
50°
21
67°
49°
22
66°
51°
23
66°
52°
24
67°
50°
25
66°
51°
26
66°
54°
27
66°
54°
28
68°
50°
29
66°
51°
30
66°
49°
31
65°
53°
1
68°
52°
2
68°
53°
3
67°
53°
4
68°
48°
5
66°
48°
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 65° to 71°, with overnight lows between 48° and 57°. The average high for August is 67° with an average low of 53°. 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.
