S
M
T
W
T
F
S
30
83°
57°
31
81°
56°
1
81°
55°
2
79°
55°
3
75°
52°
4
76°
52°
5
74°
52°
6
75°
51°
7
71°
43°
8
68°
41°
9
69°
44°
10
70°
45°
11
71°
44°
12
69°
43°
13
71°
46°
14
75°
43°
15
78°
50°
16
78°
50°
17
77°
49°
18
77°
54°
19
76°
50°
20
74°
52°
21
75°
43°
22
68°
46°
23
65°
46°
24
64°
41°
25
67°
41°
26
69°
43°
27
67°
40°
28
63°
41°
29
66°
45°
30
65°
40°
1
63°
44°
2
67°
45°
3
70°
41°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Penticton 1
Penticton 1's September 2026 forecast shows daily high temperatures ranging from 63° to 83°, with overnight lows between 40° and 57°. The average high for September is 72° with an average low of 47°. 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 1. See also: October | November | December.
