S
M
T
W
T
F
S
28
75°
53°
29
70°
49°
30
71°
49°
1
71°
50°
2
72°
52°
3
72°
56°
4
73°
52°
5
73°
50°
6
74°
54°
7
77°
58°
8
81°
59°
9
81°
57°
10
74°
56°
11
76°
57°
12
79°
56°
13
74°
52°
14
73°
51°
15
75°
56°
16
79°
58°
17
77°
54°
18
74°
51°
19
75°
58°
20
74°
59°
21
74°
59°
22
75°
58°
23
74°
57°
24
74°
53°
25
75°
54°
26
75°
55°
27
80°
57°
28
76°
54°
29
75°
56°
30
80°
57°
31
81°
58°
1
80°
50°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
July Weather in Londonderry
Londonderry's July 2026 forecast shows daily high temperatures ranging from 70° to 81°, with overnight lows between 49° and 59°. The average high for July is 75° with an average low of 55°. AccuWeather's monthly forecast extends further ahead than any other source, with day-by-day RealFeel® Temperatures giving a complete picture of how July weather will actually feel in Londonderry. See also: August | September | October.
