S
M
T
W
T
F
S
30
82°
63°
31
85°
62°
1
85°
57°
2
82°
56°
3
83°
61°
4
80°
61°
5
80°
60°
6
77°
60°
7
77°
59°
8
80°
52°
9
77°
52°
10
76°
60°
11
79°
58°
12
81°
59°
13
82°
59°
14
80°
57°
15
81°
58°
16
73°
50°
17
74°
53°
18
Hist. Avg.
76°
52°
19
Hist. Avg.
75°
51°
20
Hist. Avg.
75°
51°
21
Hist. Avg.
74°
50°
22
Hist. Avg.
74°
50°
23
Hist. Avg.
74°
49°
24
Hist. Avg.
73°
49°
25
Hist. Avg.
73°
48°
26
Hist. Avg.
72°
48°
27
Hist. Avg.
72°
47°
28
Hist. Avg.
71°
47°
29
Hist. Avg.
71°
46°
30
Hist. Avg.
70°
46°
1
Hist. Avg.
70°
45°
2
Hist. Avg.
69°
45°
3
Hist. Avg.
69°
44°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in Rensselaer
Rensselaer's September 2026 forecast shows daily high temperatures ranging from 73° to 85°, with overnight lows between 50° and 63°. The average high for September is 80° with an average low of 58°. 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.
