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