S
M
T
W
T
F
S
30
70°
47°
31
72°
51°
1
69°
52°
2
68°
46°
3
69°
46°
4
72°
50°
5
68°
46°
6
67°
45°
7
68°
45°
8
71°
46°
9
75°
49°
10
76°
53°
11
75°
50°
12
75°
53°
13
76°
52°
14
72°
44°
15
70°
45°
16
70°
50°
17
74°
52°
18
75°
48°
19
76°
51°
20
73°
49°
21
66°
51°
22
72°
52°
23
73°
49°
24
71°
50°
25
71°
53°
26
72°
52°
27
72°
51°
28
62°
48°
29
61°
45°
30
61°
47°
1
62°
45°
2
59°
41°
3
58°
43°
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 58° to 76°, with overnight lows between 41° and 53°. The average high for September is 70° with an average low of 48°. 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.
