S
M
T
W
T
F
S
30
82°
58°
31
83°
59°
1
83°
59°
2
82°
60°
3
82°
61°
4
81°
60°
5
81°
60°
6
79°
58°
7
78°
59°
8
78°
58°
9
77°
57°
10
79°
58°
11
80°
57°
12
80°
57°
13
79°
58°
14
80°
57°
15
77°
58°
16
78°
55°
17
75°
56°
18
75°
52°
19
72°
44°
20
67°
48°
21
68°
52°
22
69°
45°
23
67°
45°
24
66°
47°
25
68°
52°
26
74°
52°
27
66°
49°
28
66°
44°
29
65°
43°
30
65°
44°
1
68°
51°
2
68°
51°
3
64°
43°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Rensselaer
Rensselaer's September 2026 forecast shows daily high temperatures ranging from 64° to 83°, with overnight lows between 43° and 61°. The average high for September is 74° with an average low of 53°. 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 Rensselaer. See also: October | November | December.
