S
M
T
W
T
F
S
30
72°
58°
31
75°
51°
1
78°
59°
2
76°
64°
3
82°
63°
4
78°
64°
5
72°
57°
6
73°
56°
7
79°
50°
8
71°
53°
9
70°
52°
10
78°
58°
11
72°
46°
12
75°
43°
13
74°
63°
14
67°
49°
15
66°
42°
16
73°
58°
17
72°
55°
18
71°
50°
19
62°
41°
20
56°
48°
21
59°
40°
22
62°
38°
23
65°
40°
24
66°
44°
25
65°
46°
26
66°
47°
27
66°
47°
28
68°
49°
29
68°
51°
30
70°
51°
1
68°
49°
2
67°
50°
3
60°
47°
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 56° to 70°, with overnight lows between 38° and 51°. The average high for September is 65° with an average low of 46°. 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.
