S
M
T
W
T
F
S
30
75°
60°
31
68°
52°
1
69°
54°
2
70°
59°
3
70°
59°
4
68°
58°
5
68°
54°
6
69°
56°
7
72°
58°
8
75°
59°
9
75°
59°
10
74°
58°
11
73°
58°
12
73°
57°
13
74°
59°
14
73°
56°
15
67°
53°
16
67°
54°
17
68°
54°
18
70°
55°
19
71°
52°
20
62°
48°
21
62°
47°
22
63°
53°
23
70°
53°
24
70°
52°
25
71°
53°
26
70°
53°
27
70°
54°
28
59°
52°
29
64°
52°
30
65°
49°
1
62°
48°
2
57°
39°
3
60°
35°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Napanee
Napanee's September 2026 forecast shows daily high temperatures ranging from 57° to 75°, with overnight lows between 35° and 60°. The average high for September is 68° 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 Napanee. See also: October | November | December.
