S
M
T
W
T
F
S
28
84°
65°
29
86°
64°
30
86°
66°
31
82°
64°
1
84°
61°
2
82°
58°
3
79°
60°
4
84°
61°
5
84°
59°
6
84°
59°
7
84°
59°
8
86°
60°
9
86°
62°
10
82°
63°
11
88°
63°
12
84°
62°
13
82°
63°
14
86°
61°
15
84°
62°
16
84°
62°
17
88°
60°
18
88°
63°
19
84°
65°
20
85°
61°
21
86°
62°
22
88°
61°
23
88°
63°
24
87°
63°
25
86°
61°
26
90°
62°
27
86°
64°
28
85°
64°
29
84°
62°
30
84°
59°
31
82°
61°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
January Weather in San Jose Costa Rica
San Jose Costa Rica'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 Costa Rica. See also: February | March | April.
