S
M
T
W
T
F
S
30
71°
48°
31
79°
48°
1
67°
51°
2
70°
52°
3
68°
54°
4
70°
50°
5
72°
48°
6
75°
48°
7
72°
54°
8
77°
46°
9
81°
48°
10
73°
54°
11
70°
50°
12
68°
48°
13
59°
54°
14
64°
55°
15
66°
50°
16
75°
46°
17
77°
46°
18
72°
50°
19
70°
49°
20
72°
49°
21
70°
50°
22
68°
47°
23
68°
47°
24
66°
45°
25
66°
42°
26
67°
44°
27
68°
46°
28
67°
46°
29
67°
46°
30
66°
45°
1
67°
46°
2
64°
45°
3
62°
41°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Bonney Lake
Bonney Lake's September 2026 forecast shows daily high temperatures ranging from 62° to 72°, with overnight lows between 41° and 50°. The average high for September is 67° 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 Bonney Lake. See also: October | November | December.
