S
M
T
W
T
F
S
26
83°
63°
27
84°
64°
28
83°
65°
29
80°
64°
30
78°
64°
31
83°
63°
1
84°
65°
2
84°
64°
3
86°
63°
4
86°
64°
5
83°
63°
6
84°
62°
7
78°
63°
8
81°
59°
9
78°
58°
10
80°
56°
11
78°
62°
12
81°
63°
13
84°
62°
14
83°
56°
15
79°
55°
16
77°
55°
17
79°
60°
18
77°
55°
19
80°
55°
20
78°
54°
21
78°
55°
22
80°
59°
23
82°
56°
24
82°
54°
25
81°
54°
26
79°
57°
27
76°
55°
28
75°
57°
29
81°
61°
30
82°
57°
31
81°
51°
1
78°
50°
2
74°
52°
3
73°
51°
4
74°
51°
5
73°
50°
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 73° to 86°, with overnight lows between 50° and 65°. The average high for August is 80° with an average low of 58°. 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.
