S
M
T
W
T
F
S
30
95°
66°
31
96°
65°
1
95°
66°
2
95°
67°
3
94°
68°
4
94°
68°
5
93°
67°
6
94°
66°
7
95°
64°
8
88°
66°
9
85°
67°
10
92°
66°
11
91°
67°
12
93°
66°
13
94°
64°
14
93°
56°
15
91°
56°
16
81°
55°
17
80°
59°
18
83°
58°
19
82°
56°
20
81°
55°
21
80°
55°
22
81°
57°
23
84°
61°
24
84°
61°
25
87°
60°
26
87°
61°
27
86°
59°
28
85°
58°
29
84°
57°
30
83°
58°
1
84°
56°
2
84°
58°
3
77°
50°
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 77° to 96°, with overnight lows between 50° and 68°. The average high for September is 88° with an average low of 61°. 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.
