S
M
T
W
T
F
S
30
71°
55°
31
76°
54°
1
73°
58°
2
67°
51°
3
66°
53°
4
67°
53°
5
69°
54°
6
73°
54°
7
70°
56°
8
71°
55°
9
72°
55°
10
73°
56°
11
73°
54°
12
72°
56°
13
71°
52°
14
70°
55°
15
73°
56°
16
66°
54°
17
66°
55°
18
67°
51°
19
65°
56°
20
65°
52°
21
64°
48°
22
64°
49°
23
63°
48°
24
63°
47°
25
64°
47°
26
67°
49°
27
69°
55°
28
63°
54°
29
64°
49°
30
70°
52°
1
67°
55°
2
62°
54°
3
63°
52°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Kirkland
Kirkland's September 2026 forecast shows daily high temperatures ranging from 62° to 73°, with overnight lows between 47° and 58°. The average high for September is 68° with an average low of 53°. 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 Kirkland. See also: October | November | December.
