After gradual clearing on Sunday, evening temperatures in Napa will again flirt with the freezing mark, according to the National Weather Service.
Areas of fog and frost should persist until about 10 a.m., after which sunnier skies are expected, with a high of 63 degrees at Napa County Airport.
The overnight low is forecast at 32 under increasing clouds, with patchy fog lingering until 10 a.m. Monday.
Local conditions should remain dry and around 60 degrees by day for most of the week, before a chance of showers beginning Friday night.
Here is the five-day weather outlook for Napa:
Martin Luther King Day: 63 / 32 — patchy morning fog, then gradual clearing
Tuesday: 61 / 39 — sunny
Wednesday: 57 / 35 — mostly cloudy
Thursday: 60 / 35 — mostly sunny
Friday: 59 / 35 — partly sunny by day; slight chance of nighttime showers