S
M
T
W
T
F
S
30
63°
56°
31
63°
56°
1
58°
55°
2
58°
54°
3
59°
53°
4
58°
53°
5
58°
50°
6
60°
52°
7
61°
50°
8
61°
54°
9
63°
55°
10
62°
54°
11
58°
54°
12
56°
53°
13
58°
54°
14
57°
49°
15
56°
48°
16
56°
48°
17
57°
49°
18
56°
53°
19
57°
50°
20
55°
48°
21
55°
49°
22
56°
53°
23
59°
52°
24
59°
52°
25
58°
49°
26
57°
47°
27
55°
51°
28
54°
52°
29
55°
51°
30
53°
47°
1
54°
48°
2
53°
49°
3
54°
47°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Princetown
Princetown's September 2026 forecast shows daily high temperatures ranging from 53° to 63°, with overnight lows between 47° and 56°. The average high for September is 57° 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 Princetown. See also: October | November | December.
