S
M
T
W
T
F
S
30
71°
44°
31
71°
45°
1
70°
52°
2
69°
53°
3
68°
52°
4
69°
50°
5
68°
47°
6
69°
43°
7
69°
43°
8
70°
44°
9
70°
42°
10
72°
44°
11
70°
47°
12
66°
42°
13
67°
47°
14
70°
44°
15
66°
43°
16
Hist. Avg.
69°
48°
17
Hist. Avg.
69°
47°
18
Hist. Avg.
69°
47°
19
Hist. Avg.
68°
47°
20
Hist. Avg.
68°
47°
21
Hist. Avg.
68°
47°
22
Hist. Avg.
67°
46°
23
Hist. Avg.
67°
46°
24
Hist. Avg.
67°
46°
25
Hist. Avg.
66°
46°
26
Hist. Avg.
66°
46°
27
Hist. Avg.
66°
45°
28
Hist. Avg.
65°
45°
29
Hist. Avg.
65°
45°
30
Hist. Avg.
65°
45°
1
Hist. Avg.
64°
45°
2
Hist. Avg.
64°
44°
3
Hist. Avg.
64°
44°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in Upper Sumas 6
Upper Sumas 6's September 2026 forecast shows daily high temperatures ranging from 66° to 72°, with overnight lows between 42° and 53°. The average high for September is 69° 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 Upper Sumas 6. See also: October | November | December.
