S
M
T
W
T
F
S
30
63°
60°
31
75°
56°
1
73°
59°
2
64°
51°
3
61°
52°
4
66°
51°
5
68°
53°
6
71°
55°
7
69°
57°
8
70°
55°
9
70°
57°
10
71°
55°
11
70°
51°
12
65°
51°
13
66°
48°
14
68°
53°
15
70°
52°
16
65°
53°
17
65°
53°
18
64°
52°
19
63°
52°
20
63°
50°
21
64°
47°
22
61°
48°
23
62°
45°
24
62°
45°
25
63°
46°
26
65°
48°
27
68°
51°
28
65°
51°
29
61°
50°
30
65°
50°
1
66°
51°
2
62°
50°
3
64°
49°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Nanaimo
Nanaimo's September 2026 forecast shows daily high temperatures ranging from 61° to 75°, with overnight lows between 45° and 59°. The average high for September is 66° 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 Nanaimo. See also: October | November | December.
