Best time to visit Napa

May is the best month in Napa, scoring 94 out of 100, with December the weakest at 54. The 40-point spread means timing is worth planning around without being decisive. Only 3 months come close to the top, which makes the timing narrow.

July is the warmest month at 33.9 °C and December the coolest at 14.4 °C — a 19.5 °C spread across the year. Around 104 days a year top 30 °C, concentrated in July and the months either side.

There is a real wet season here. January, February, March and December carry the rain — up to 12 wet days in a month — while June to September drop as low as 0. That 12-day gap is the biggest single difference between a good month and a bad one in Napa, and it moves further than the temperature does.

Daylight runs from 9.5 hours in winter to 14.8 in summer, enough to notice on a sightseeing itinerary.

The three strongest months are May, October, April. The one to think twice about is December. Each month below has its own page with rainfall reliability, extremes, daylight and crowd levels.

Napa month by month