S
M
T
W
T
F
S
30
68°
48°
31
67°
49°
1
69°
50°
2
71°
52°
3
71°
54°
4
70°
49°
5
69°
48°
6
67°
50°
7
70°
48°
8
70°
48°
9
69°
51°
10
70°
53°
11
70°
52°
12
69°
47°
13
66°
46°
14
65°
50°
15
64°
51°
16
65°
53°
17
66°
51°
18
67°
50°
19
64°
52°
20
68°
51°
21
68°
50°
22
67°
46°
23
62°
44°
24
62°
46°
25
63°
48°
26
64°
46°
27
63°
49°
28
61°
51°
29
64°
50°
30
63°
49°
1
64°
50°
2
64°
47°
3
61°
42°
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 61° to 71°, with overnight lows between 42° and 54°. The average high for September is 66° with an average low of 49°. 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.
