S
M
T
W
T
F
S
30
81°
66°
31
90°
68°
1
92°
69°
2
91°
70°
3
91°
72°
4
91°
70°
5
88°
70°
6
81°
57°
7
81°
55°
8
84°
55°
9
79°
64°
10
72°
55°
11
81°
54°
12
88°
61°
13
80°
49°
14
75°
62°
15
90°
66°
16
81°
68°
17
82°
62°
18
79°
62°
19
77°
57°
20
69°
54°
21
70°
51°
22
72°
50°
23
73°
52°
24
74°
52°
25
76°
53°
26
74°
49°
27
78°
55°
28
75°
55°
29
75°
55°
30
76°
54°
1
75°
53°
2
76°
52°
3
74°
53°
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 69° to 90°, with overnight lows between 49° and 68°. The average high for September is 76° with an average low of 55°. 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.
