S
M
T
W
T
F
S
30
70°
52°
31
73°
57°
1
69°
56°
2
69°
52°
3
70°
51°
4
72°
56°
5
69°
52°
6
68°
50°
7
68°
50°
8
70°
50°
9
76°
56°
10
76°
59°
11
75°
56°
12
76°
58°
13
77°
57°
14
71°
49°
15
72°
49°
16
71°
54°
17
75°
56°
18
76°
52°
19
75°
56°
20
74°
54°
21
66°
55°
22
73°
56°
23
74°
52°
24
72°
54°
25
72°
58°
26
73°
57°
27
73°
56°
28
64°
53°
29
62°
50°
30
62°
52°
1
63°
49°
2
60°
46°
3
59°
48°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Bothell
Bothell's September 2026 forecast shows daily high temperatures ranging from 59° to 77°, with overnight lows between 46° and 59°. The average high for September is 70° with an average low of 53°. 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 Bothell. See also: October | November | December.
