S
M
T
W
T
F
S
29
59°
49°
30
59°
48°
1
60°
48°
2
58°
47°
3
59°
49°
4
62°
48°
5
61°
47°
6
60°
45°
7
59°
47°
8
61°
47°
9
57°
46°
10
56°
45°
11
55°
39°
12
56°
40°
13
55°
42°
14
60°
45°
15
62°
47°
16
61°
46°
17
61°
39°
18
56°
47°
19
53°
46°
20
58°
45°
21
59°
39°
22
58°
37°
23
52°
38°
24
53°
45°
25
54°
45°
26
54°
42°
27
53°
40°
28
53°
38°
29
52°
38°
30
51°
36°
31
52°
37°
1
52°
38°
2
53°
40°
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 62°, with overnight lows between 36° and 49°. The average high for December is 57° with an average low of 43°. 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.
