S
M
T
W
T
F
S
30
71°
49°
31
81°
46°
1
80°
49°
2
76°
57°
3
66°
52°
4
69°
49°
5
72°
50°
6
75°
46°
7
71°
51°
8
78°
44°
9
80°
50°
10
77°
45°
11
70°
48°
12
71°
50°
13
67°
45°
14
71°
48°
15
73°
50°
16
77°
49°
17
77°
52°
18
81°
53°
19
79°
54°
20
71°
50°
21
72°
51°
22
75°
51°
23
79°
53°
24
69°
48°
25
61°
45°
26
61°
43°
27
60°
38°
28
59°
39°
29
58°
37°
30
58°
37°
1
59°
44°
2
59°
43°
3
58°
36°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Penticton
Penticton's September 2026 forecast shows daily high temperatures ranging from 58° to 81°, with overnight lows between 36° and 54°. The average high for September is 68° with an average low of 46°. 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 Penticton. See also: October | November | December.
