S
M
T
W
T
F
S
30
74°
47°
31
71°
41°
1
74°
41°
2
74°
49°
3
71°
56°
4
71°
57°
5
64°
52°
6
68°
45°
7
75°
44°
8
67°
42°
9
71°
40°
10
71°
52°
11
63°
42°
12
76°
55°
13
74°
50°
14
62°
41°
15
70°
53°
16
70°
46°
17
70°
49°
18
67°
48°
19
66°
42°
20
62°
42°
21
66°
43°
22
67°
42°
23
66°
48°
24
68°
38°
25
58°
32°
26
59°
33°
27
57°
42°
28
59°
39°
29
57°
34°
30
61°
40°
1
63°
42°
2
59°
41°
3
64°
40°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Saint-Prosper-de-Dorchester
Saint-Prosper-de-Dorchester's September 2026 forecast shows daily high temperatures ranging from 57° to 76°, with overnight lows between 32° and 55°. The average high for September is 65° with an average low of 43°. 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 Saint-Prosper-de-Dorchester. See also: October | November | December.
