S
M
T
W
T
F
S
30
72°
57°
31
72°
54°
1
72°
52°
2
70°
62°
3
75°
63°
4
69°
51°
5
68°
54°
6
77°
56°
7
69°
54°
8
65°
53°
9
66°
49°
10
64°
50°
11
66°
50°
12
67°
49°
13
66°
53°
14
67°
54°
15
66°
50°
16
63°
46°
17
62°
49°
18
63°
47°
19
64°
51°
20
66°
52°
21
67°
52°
22
67°
51°
23
65°
51°
24
63°
50°
25
66°
51°
26
63°
50°
27
65°
49°
28
64°
50°
29
64°
51°
30
65°
50°
1
59°
48°
2
59°
46°
3
60°
44°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Glastonbury
Glastonbury's September 2026 forecast shows daily high temperatures ranging from 59° to 77°, with overnight lows between 44° and 63°. The average high for September is 66° with an average low of 51°. 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 Glastonbury. See also: October | November | December.
