S
M
T
W
T
F
S
30
85°
59°
31
81°
58°
1
79°
60°
2
81°
63°
3
80°
59°
4
80°
57°
5
82°
59°
6
81°
62°
7
80°
56°
8
79°
57°
9
77°
62°
10
82°
55°
11
78°
54°
12
77°
54°
13
77°
59°
14
81°
59°
15
83°
60°
16
83°
60°
17
82°
59°
18
83°
59°
19
82°
51°
20
75°
51°
21
73°
55°
22
74°
56°
23
78°
56°
24
79°
57°
25
80°
52°
26
79°
48°
27
75°
49°
28
71°
48°
29
71°
48°
30
70°
53°
1
71°
55°
2
Hist. Avg.
74°
50°
3
Hist. Avg.
73°
49°
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 70° to 85°, with overnight lows between 48° and 63°. The average high for September is 78° with an average low of 56°. 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.
