S
M
T
W
T
F
S
26
75°
55°
27
80°
57°
28
76°
54°
29
75°
56°
30
80°
57°
31
81°
58°
1
80°
50°
2
77°
50°
3
74°
51°
4
75°
51°
5
73°
50°
6
74°
51°
7
75°
50°
8
76°
54°
9
77°
57°
10
78°
57°
11
77°
56°
12
79°
57°
13
77°
57°
14
80°
55°
15
80°
49°
16
75°
54°
17
78°
49°
18
74°
48°
19
73°
47°
20
72°
48°
21
73°
51°
22
74°
50°
23
71°
49°
24
75°
55°
25
72°
52°
26
78°
55°
27
78°
55°
28
77°
54°
29
77°
54°
30
73°
49°
31
71°
46°
1
71°
45°
2
70°
46°
3
70°
52°
4
71°
48°
5
71°
45°
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 70° to 81°, with overnight lows between 45° and 58°. The average high for August is 75° 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 August weather will actually feel in Londonderry. See also: September | October | November.
