S
M
T
W
T
F
S
28
86°
53°
29
53°
42°
30
57°
39°
31
70°
34°
1
74°
42°
2
83°
55°
3
78°
49°
4
75°
48°
5
78°
46°
6
81°
52°
7
80°
49°
8
75°
49°
9
72°
45°
10
54°
36°
11
57°
32°
12
54°
44°
13
59°
44°
14
68°
42°
15
72°
38°
16
66°
43°
17
55°
28°
18
65°
21°
19
64°
31°
20
55°
36°
21
69°
31°
22
70°
32°
23
66°
40°
24
40°
24°
25
36°
21°
26
47°
18°
27
52°
22°
28
66°
28°
29
71°
32°
30
61°
38°
31
55°
31°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
January Weather in San Francisco
San Francisco'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 Francisco. See also: February | March | April.
