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