S
M
T
W
T
F
S
30
81°
54°
31
83°
56°
1
85°
57°
2
77°
54°
3
82°
56°
4
86°
55°
5
85°
56°
6
86°
55°
7
83°
51°
8
82°
53°
9
84°
53°
10
76°
50°
11
74°
46°
12
74°
48°
13
72°
43°
14
72°
42°
15
73°
43°
16
77°
46°
17
77°
51°
18
71°
49°
19
71°
49°
20
73°
46°
21
72°
40°
22
73°
44°
23
73°
46°
24
77°
43°
25
79°
48°
26
78°
39°
27
67°
37°
28
64°
36°
29
65°
34°
30
64°
41°
1
65°
44°
2
65°
38°
3
68°
45°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Kittitas
Kittitas's September 2026 forecast shows daily high temperatures ranging from 64° to 86°, with overnight lows between 34° and 57°. The average high for September is 75° with an average low of 47°. 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 Kittitas. See also: October | November | December.
