S
M
T
W
T
F
S
30
80°
71°
31
81°
71°
1
80°
70°
2
81°
70°
3
78°
69°
4
77°
70°
5
77°
69°
6
78°
68°
7
78°
69°
8
80°
71°
9
81°
71°
10
81°
70°
11
80°
71°
12
80°
70°
13
79°
71°
14
74°
69°
15
76°
67°
16
75°
70°
17
79°
69°
18
81°
68°
19
79°
67°
20
79°
67°
21
80°
66°
22
78°
64°
23
76°
65°
24
78°
68°
25
79°
69°
26
80°
71°
27
81°
70°
28
82°
69°
29
81°
66°
30
78°
63°
1
76°
63°
2
73°
64°
3
71°
61°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Harborview
Harborview's September 2026 forecast shows daily high temperatures ranging from 71° to 82°, with overnight lows between 61° and 71°. The average high for September is 78° with an average low of 68°. 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 Harborview. See also: October | November | December.
