S
M
T
W
T
F
S
30
72°
55°
31
76°
60°
1
71°
56°
2
70°
50°
3
69°
56°
4
71°
57°
5
68°
51°
6
70°
50°
7
69°
48°
8
68°
53°
9
68°
54°
10
Hist. Avg.
70°
53°
11
Hist. Avg.
69°
53°
12
Hist. Avg.
69°
53°
13
Hist. Avg.
69°
53°
14
Hist. Avg.
68°
53°
15
Hist. Avg.
68°
53°
16
Hist. Avg.
68°
52°
17
Hist. Avg.
68°
52°
18
Hist. Avg.
67°
52°
19
Hist. Avg.
67°
52°
20
Hist. Avg.
67°
52°
21
Hist. Avg.
66°
52°
22
Hist. Avg.
66°
51°
23
Hist. Avg.
66°
51°
24
Hist. Avg.
65°
51°
25
Hist. Avg.
65°
51°
26
Hist. Avg.
65°
50°
27
Hist. Avg.
64°
50°
28
Hist. Avg.
64°
50°
29
Hist. Avg.
64°
50°
30
Hist. Avg.
63°
50°
1
Hist. Avg.
63°
49°
2
Hist. Avg.
62°
49°
3
Hist. Avg.
62°
49°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in Bothell
Bothell's September 2026 forecast shows daily high temperatures ranging from 68° to 76°, with overnight lows between 48° and 60°. The average high for September is 70° with an average low of 54°. 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.
