S
M
T
W
T
F
S
28
82°
65°
29
84°
65°
30
82°
66°
31
78°
68°
1
79°
67°
2
82°
66°
3
83°
65°
4
85°
62°
5
81°
66°
6
83°
63°
7
83°
64°
8
83°
66°
9
82°
65°
10
84°
64°
11
84°
66°
12
82°
67°
13
82°
62°
14
84°
65°
15
82°
63°
16
83°
67°
17
88°
67°
18
86°
66°
19
82°
68°
20
83°
67°
21
79°
67°
22
85°
66°
23
86°
62°
24
85°
67°
25
87°
62°
26
88°
59°
27
84°
59°
28
84°
64°
29
82°
66°
30
87°
65°
31
83°
64°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
January Weather in San Jose
San Jose's January 2026 forecast shows daily high temperatures ranging from ° to °, with overnight lows between ° and °. The average high for January is ° with an average low of °. 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 San Jose. See also: February | March | April.
