S
M
T
W
T
F
S
29
63°
40°
30
56°
40°
1
57°
37°
2
56°
39°
3
58°
39°
4
57°
42°
5
57°
42°
6
60°
41°
7
59°
47°
8
60°
46°
9
58°
48°
10
59°
48°
11
61°
47°
12
62°
45°
13
61°
45°
14
60°
46°
15
61°
46°
16
62°
45°
17
61°
43°
18
57°
45°
19
54°
45°
20
53°
46°
21
60°
41°
22
60°
45°
23
56°
47°
24
59°
46°
25
61°
45°
26
57°
46°
27
57°
42°
28
58°
41°
29
56°
39°
30
55°
47°
31
55°
40°
1
51°
43°
2
Hist. Avg.
58°
44°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
December Weather in San Leandro
San Leandro's December 2026 forecast shows daily high temperatures ranging from 51° to 63°, with overnight lows between 37° and 48°. The average high for December is 58° with an average low of 44°. AccuWeather's monthly forecast extends further ahead than any other source, with day-by-day RealFeel® Temperatures giving a complete picture of how December weather will actually feel in San Leandro. See also: January | February | March.
