S
M
T
W
T
F
S
30
67°
61°
31
67°
59°
1
67°
57°
2
66°
62°
3
69°
64°
4
66°
59°
5
67°
56°
6
71°
60°
7
66°
61°
8
63°
58°
9
63°
56°
10
64°
55°
11
67°
56°
12
67°
56°
13
67°
64°
14
68°
63°
15
65°
58°
16
63°
56°
17
N/A
18
59°
54°
19
62°
52°
20
63°
49°
21
67°
52°
22
64°
52°
23
64°
49°
24
61°
55°
25
60°
54°
26
61°
51°
27
60°
51°
28
58°
51°
29
59°
50°
30
59°
53°
1
58°
52°
2
58°
51°
3
56°
48°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in Princetown
Princetown's September 2026 forecast shows daily high temperatures ranging from 56° to 67°, with overnight lows between 48° and 55°. The average high for September is 61° with an average low of 52°. 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.
