S
M
T
W
T
F
S
30
78°
59°
31
79°
57°
1
72°
54°
2
70°
54°
3
70°
53°
4
71°
49°
5
73°
56°
6
78°
57°
7
78°
56°
8
77°
57°
9
77°
57°
10
76°
56°
11
77°
56°
12
77°
57°
13
76°
57°
14
76°
44°
15
66°
45°
16
68°
44°
17
69°
47°
18
69°
43°
19
65°
47°
20
65°
46°
21
71°
52°
22
73°
51°
23
73°
42°
24
66°
39°
25
62°
43°
26
68°
47°
27
71°
50°
28
71°
47°
29
66°
39°
30
61°
39°
1
60°
44°
2
65°
47°
3
64°
43°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Plattsburgh
Plattsburgh's September 2026 forecast shows daily high temperatures ranging from 60° to 79°, with overnight lows between 39° and 59°. The average high for September is 71° with an average low of 50°. 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 Plattsburgh. See also: October | November | December.
