S
M
T
W
T
F
S
27
65°
48°
28
64°
46°
29
63°
53°
30
65°
49°
1
68°
51°
2
71°
52°
3
67°
54°
4
69°
51°
5
68°
52°
6
66°
52°
7
67°
53°
8
67°
51°
9
58°
50°
10
58°
45°
11
60°
43°
12
61°
41°
13
62°
46°
14
67°
48°
15
75°
54°
16
79°
54°
17
62°
42°
18
60°
45°
19
60°
45°
20
60°
41°
21
61°
46°
22
60°
45°
23
60°
43°
24
56°
44°
25
60°
45°
26
59°
43°
27
57°
44°
28
60°
46°
29
60°
43°
30
60°
47°
31
60°
42°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
October Weather in Issaquah
Issaquah's October 2026 forecast shows daily high temperatures ranging from 56° to 79°, with overnight lows between 41° and 54°. The average high for October is 62° with an average low of 45°. AccuWeather's monthly forecast extends further ahead than any other source, with day-by-day RealFeel® Temperatures giving a complete picture of how October weather will actually feel in Issaquah. See also: November | December | January.
