S
M
T
W
T
F
S
30
80°
64°
31
85°
70°
1
87°
65°
2
92°
68°
3
90°
66°
4
78°
66°
5
77°
63°
6
77°
55°
7
77°
52°
8
82°
68°
9
77°
62°
10
75°
49°
11
78°
57°
12
81°
59°
13
78°
57°
14
77°
62°
15
72°
53°
16
73°
52°
17
68°
48°
18
66°
46°
19
66°
45°
20
65°
45°
21
68°
48°
22
66°
52°
23
67°
53°
24
73°
53°
25
74°
52°
26
74°
52°
27
73°
51°
28
74°
53°
29
74°
54°
30
75°
54°
1
74°
50°
2
72°
45°
3
60°
42°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Bellevue
Bellevue's September 2026 forecast shows daily high temperatures ranging from 60° to 82°, with overnight lows between 42° and 68°. The average high for September is 72° with an average low of 52°. 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 Bellevue. See also: October | November | December.
