S
M
T
W
T
F
S
30
77°
61°
31
83°
63°
1
84°
55°
2
82°
56°
3
76°
55°
4
77°
56°
5
78°
63°
6
81°
61°
7
83°
56°
8
75°
60°
9
75°
61°
10
76°
61°
11
77°
59°
12
78°
58°
13
75°
59°
14
73°
53°
15
73°
52°
16
72°
51°
17
72°
53°
18
73°
57°
19
76°
57°
20
74°
58°
21
76°
55°
22
72°
49°
23
70°
54°
24
69°
56°
25
74°
50°
26
67°
52°
27
73°
54°
28
74°
53°
29
Hist. Avg.
70°
50°
30
Hist. Avg.
70°
50°
1
Hist. Avg.
70°
50°
2
Hist. Avg.
69°
49°
3
Hist. Avg.
69°
49°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in Glastonbury
Glastonbury's September 2026 forecast shows daily high temperatures ranging from 67° to 84°, with overnight lows between 49° and 63°. The average high for September is 76° with an average low of 56°. 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.
