S
M
T
W
T
F
S
30
79°
56°
31
80°
55°
1
82°
56°
2
83°
57°
3
82°
56°
4
81°
56°
5
81°
55°
6
80°
55°
7
79°
51°
8
71°
47°
9
78°
53°
10
78°
54°
11
67°
47°
12
70°
49°
13
78°
52°
14
79°
54°
15
78°
52°
16
69°
51°
17
75°
51°
18
76°
50°
19
77°
50°
20
76°
49°
21
74°
52°
22
73°
52°
23
72°
47°
24
68°
42°
25
66°
42°
26
66°
41°
27
68°
41°
28
68°
44°
29
69°
46°
30
68°
40°
1
64°
38°
2
62°
42°
3
66°
42°
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 62° to 83°, with overnight lows between 38° and 57°. The average high for September is 74° with an average low of 49°. 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.
