S
M
T
W
T
F
S
30
71°
49°
31
81°
53°
1
80°
55°
2
64°
52°
3
69°
50°
4
66°
48°
5
75°
47°
6
72°
49°
7
64°
53°
8
77°
53°
9
81°
49°
10
82°
54°
11
77°
46°
12
79°
47°
13
62°
50°
14
61°
49°
15
65°
50°
16
66°
42°
17
78°
45°
18
78°
49°
19
77°
48°
20
77°
50°
21
75°
48°
22
71°
47°
23
70°
49°
24
72°
50°
25
70°
47°
26
68°
48°
27
67°
48°
28
65°
45°
29
64°
40°
30
57°
37°
1
56°
36°
2
65°
43°
3
60°
41°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Castlegar
Castlegar's September 2026 forecast shows daily high temperatures ranging from 56° to 78°, with overnight lows between 36° and 50°. The average high for September is 69° with an average low of 45°. 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 Castlegar. See also: October | November | December.
