S
M
T
W
T
F
S
30
81°
72°
31
78°
69°
1
79°
67°
2
76°
66°
3
77°
63°
4
76°
65°
5
83°
65°
6
95°
73°
7
95°
74°
8
93°
74°
9
94°
76°
10
86°
75°
11
81°
73°
12
79°
71°
13
78°
71°
14
75°
70°
15
76°
70°
16
77°
69°
17
79°
67°
18
78°
67°
19
77°
68°
20
76°
69°
21
77°
68°
22
78°
69°
23
77°
68°
24
77°
67°
25
78°
68°
26
78°
68°
27
77°
67°
28
78°
64°
29
77°
65°
30
73°
66°
1
72°
65°
2
75°
66°
3
74°
67°
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 72° to 79°, with overnight lows between 64° and 69°. The average high for September is 77° with an average low of 67°. 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.
