S
M
T
W
T
F
S
26
92°
60°
27
90°
62°
28
85°
63°
29
91°
64°
30
88°
65°
31
85°
64°
1
91°
64°
2
88°
63°
3
87°
64°
4
91°
64°
5
92°
63°
6
92°
64°
7
91°
64°
8
91°
62°
9
83°
63°
10
83°
62°
11
90°
61°
12
89°
62°
13
83°
62°
14
82°
58°
15
86°
62°
16
89°
62°
17
86°
61°
18
89°
62°
19
89°
62°
20
82°
61°
21
81°
61°
22
81°
60°
23
84°
61°
24
86°
59°
25
89°
58°
26
89°
51°
27
80°
50°
28
78°
49°
29
79°
50°
30
80°
55°
31
86°
49°
1
83°
47°
2
77°
46°
3
76°
48°
4
78°
48°
5
79°
55°
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 76° to 92°, with overnight lows between 46° and 65°. The average high for August is 86° with an average low of 59°. 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.
