S
M
T
W
T
F
S
27
44°
36°
28
42°
33°
29
43°
34°
30
43°
35°
31
42°
35°
1
43°
36°
2
43°
35°
3
44°
34°
4
44°
34°
5
45°
35°
6
43°
36°
7
45°
38°
8
45°
39°
9
46°
40°
10
47°
38°
11
48°
37°
12
46°
38°
13
45°
39°
14
46°
37°
15
47°
38°
16
44°
37°
17
46°
32°
18
45°
31°
19
42°
30°
20
43°
32°
21
45°
40°
22
46°
40°
23
Hist. Avg.
49°
38°
24
Hist. Avg.
49°
38°
25
Hist. Avg.
49°
38°
26
Hist. Avg.
49°
38°
27
Hist. Avg.
49°
38°
28
Hist. Avg.
49°
38°
29
Hist. Avg.
49°
38°
30
Hist. Avg.
49°
38°
31
Hist. Avg.
49°
38°
1
Hist. Avg.
49°
38°
2
Hist. Avg.
49°
38°
3
Hist. Avg.
49°
38°
4
Hist. Avg.
49°
38°
5
Hist. Avg.
50°
38°
6
Hist. Avg.
50°
38°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
January Weather in Issaquah
Issaquah's January 2027 forecast shows daily high temperatures ranging from 42° to 48°, with overnight lows between 30° and 40°. The average high for January is 45° with an average low of 36°. AccuWeather's monthly forecast extends further ahead than any other source, with day-by-day RealFeel® Temperatures giving a complete picture of how January weather will actually feel in Issaquah. See also: February | March | April.
