S
M
T
W
T
F
S
30
77°
59°
31
77°
60°
1
76°
60°
2
77°
57°
3
76°
51°
4
68°
48°
5
67°
57°
6
69°
59°
7
75°
58°
8
75°
57°
9
74°
54°
10
70°
56°
11
73°
55°
12
73°
58°
13
74°
58°
14
73°
56°
15
73°
50°
16
71°
49°
17
66°
53°
18
71°
48°
19
67°
45°
20
65°
43°
21
60°
42°
22
60°
52°
23
63°
47°
24
62°
43°
25
60°
42°
26
60°
48°
27
63°
51°
28
67°
45°
29
66°
44°
30
61°
46°
1
58°
44°
2
63°
40°
3
56°
40°
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 56° to 77°, with overnight lows between 40° and 60°. The average high for September is 68° with an average low of 51°. 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.
