S
M
T
W
T
F
S
30
85°
62°
31
84°
68°
1
88°
73°
2
92°
71°
3
89°
68°
4
81°
67°
5
79°
65°
6
79°
59°
7
79°
58°
8
85°
67°
9
89°
70°
10
75°
60°
11
79°
56°
12
79°
62°
13
82°
65°
14
82°
66°
15
81°
63°
16
74°
55°
17
72°
54°
18
69°
52°
19
67°
51°
20
71°
53°
21
70°
52°
22
71°
57°
23
71°
56°
24
75°
56°
25
76°
57°
26
76°
56°
27
74°
55°
28
75°
57°
29
76°
57°
30
76°
56°
1
75°
55°
2
74°
50°
3
71°
47°
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 67° to 89°, with overnight lows between 47° and 70°. The average high for September is 76° with an average low of 57°. 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.
