S
M
T
W
T
F
S
30
83°
58°
31
79°
54°
1
76°
54°
2
76°
55°
3
77°
55°
4
77°
56°
5
74°
56°
6
74°
60°
7
75°
60°
8
80°
55°
9
74°
54°
10
73°
53°
11
74°
53°
12
73°
55°
13
72°
56°
14
71°
52°
15
72°
58°
16
72°
51°
17
74°
52°
18
72°
52°
19
77°
53°
20
Hist. Avg.
74°
51°
21
Hist. Avg.
74°
51°
22
Hist. Avg.
73°
50°
23
Hist. Avg.
73°
50°
24
Hist. Avg.
73°
49°
25
Hist. Avg.
72°
49°
26
Hist. Avg.
72°
49°
27
Hist. Avg.
71°
48°
28
Hist. Avg.
71°
48°
29
Hist. Avg.
71°
47°
30
Hist. Avg.
70°
47°
1
Hist. Avg.
70°
46°
2
Hist. Avg.
70°
46°
3
Hist. Avg.
69°
46°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in Guernsey
Guernsey's September 2026 forecast shows daily high temperatures ranging from 71° to 83°, with overnight lows between 51° and 60°. The average high for September 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 September weather will actually feel in Guernsey. See also: October | November | December.
