Average data for 10 years
1 January
Monday
+12°
+10°
2 January
Tuesday
+12°
+10°
3 January
Wednesday
+12°
+11°
4 January
Thursday
+13°
+11°
5 January
Friday
+12°
+10°
6 January
Saturday
+12°
+10°
7 January
Sunday
+13°
+11°
8 January
Monday
+13°
+11°
9 January
Tuesday
+12°
+11°
10 January
Wednesday
+13°
+11°
11 January
Thursday
+13°
+12°
12 January
Friday
+14°
+13°
13 January
Saturday
+15°
+13°
14 January
Sunday
+14°
+13°
15 January
Monday
+14°
+12°
16 January
Tuesday
+14°
+12°
17 January
Wednesday
+14°
+12°
18 January
Thursday
+15°
+13°
19 January
Friday
+14°
+12°
20 January
Saturday
+14°
+12°
21 January
Sunday
+14°
+11°
22 January
Monday
+13°
+12°
23 January
Tuesday
+13°
+11°
24 January
Wednesday
+13°
+12°
25 January
Thursday
+14°
+13°
26 January
Friday
+14°
+12°
27 January
Saturday
+14°
+12°
28 January
Sunday
+13°
+12°
29 January
Monday
+14°
+12°
30 January
Tuesday
+13°
+11°
31 January
Wednesday
+14°
+11°
In January, the weather in San Mateo is typically warm. Average daily high temperature in January is about 13 degrees above zero. On average, San Mateo has 15 sunny, 10 partly cloudy, and 6 rainy days in January. The rains are usually heavy. January as well as February, March, and December is considered the most uncomfortable time to visit San Mateo.