S
M
T
W
T
F
S
30
74°
51°
31
72°
48°
1
69°
50°
2
69°
48°
3
70°
48°
4
69°
49°
5
68°
49°
6
68°
51°
7
69°
55°
8
69°
50°
9
68°
48°
10
68°
48°
11
69°
49°
12
67°
51°
13
68°
50°
14
67°
49°
15
66°
51°
16
68°
45°
17
66°
46°
18
67°
46°
19
72°
47°
20
Hist. Avg.
68°
48°
21
Hist. Avg.
67°
47°
22
Hist. Avg.
67°
47°
23
Hist. Avg.
66°
47°
24
Hist. Avg.
66°
46°
25
Hist. Avg.
66°
46°
26
Hist. Avg.
65°
46°
27
Hist. Avg.
65°
45°
28
Hist. Avg.
64°
45°
29
Hist. Avg.
64°
45°
30
Hist. Avg.
64°
44°
1
Hist. Avg.
63°
44°
2
Hist. Avg.
63°
44°
3
Hist. Avg.
62°
43°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in Dorchester
Dorchester's September 2026 forecast shows daily high temperatures ranging from 66° to 74°, with overnight lows between 45° and 55°. The average high for September is 69° 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 Dorchester. See also: October | November | December.
