S
M
T
W
T
F
S
26
85°
67°
27
84°
66°
28
79°
65°
29
80°
66°
30
83°
67°
31
85°
67°
1
85°
66°
2
83°
65°
3
87°
66°
4
87°
65°
5
80°
64°
6
83°
62°
7
80°
59°
8
78°
60°
9
78°
58°
10
79°
59°
11
81°
65°
12
86°
66°
13
83°
62°
14
86°
58°
15
80°
60°
16
81°
65°
17
81°
59°
18
79°
59°
19
79°
60°
20
81°
59°
21
83°
64°
22
86°
64°
23
86°
63°
24
85°
64°
25
85°
63°
26
86°
64°
27
85°
62°
28
84°
64°
29
84°
63°
30
83°
58°
31
79°
54°
1
76°
54°
2
76°
55°
3
77°
55°
4
77°
56°
5
74°
56°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
August Weather in Guernsey
Guernsey's August 2026 forecast shows daily high temperatures ranging from 74° to 87°, with overnight lows between 54° and 67°. The average high for August is 82° with an average low of 62°. 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 Guernsey. See also: September | October | November.
