The best times to visit Napa for ideal weather are
April 2nd to November 18th
based on average temperature and humidity from NOAA (the National Oceanic and Atmospheric Administration). Read below for more weather and travel details.
Napa Travel Guide
Weather in Napa
Average temperatures in Napa vary little and are extremely temperate all year. The area is in the top 1 percent of tourist destinations for pleasant weather. Weeks with ideal weather are listed above. If you’re looking for the very warmest time to visit Napa, the hottest months are July, August, and then September. See average monthly temperatures below. The warmest time of year is generally late August to early September where highs are regularly around 66.1°F (18.9°C) with temperatures rarely dropping below 44.8°F (7.1°C) at night.
Napa Temperatures (Fahrenheit)
Napa Temperatures (Celsius)
The way we experience weather isn’t all about temperature. Higher temperatures affect us much more at higher humidity, and colder temperatures feel piercing with high winds. Our perceived temperatures factor in humidity and wind chill to better represent how hot or cold the day feels to a person.
Napa Perceived Temperature (F)
Napa Perceived Temperature (C)
Average Napa Temperatures by Month
Daily highs (averaged for the month) usually give the best indication of the weather. A significantly lower mean and low generally just means it gets colder at night.
|Month||Avg. High (°F)||Avg. Mean (°F)||Avg. Low (°F)|
|Month||Avg. High (°C)||Avg. Mean (°C)||Avg. Low (°C)|
Precipitation (Rain or Snow)
If dry weather is what you’re after, the months with the lowest chance of precipitation in Napa are December, February, and then January. The lowest chance of rain or snow occurs around mid-June. For example, on the week of June 18th there are only 0 days of precipitation on average. By contrast, it’s most likely to rain or snow in mid-December with an average of 1.7 days with significant precipitation the week of December 17th.
When can you find snow in Napa? Weather stations report no annual snow. Please note that a value of 0 for snow in the graph below may either mean there was no snow, or that snow is unreported.
Chance of Precipitation
The graph below shows the % chance of rainy and snowy days in Napa.
Snow on the Ground
The graph below shows the average snow on the ground in Napa (in).
Average Rain and Snow by Month
|Month||Daily Chance of Rain||Average Snow Depth (in)||Total Precipitation (in)|
|Month||Daily Chance of Rain||Average Snow Depth (cm)||Total Precipitation (cm)|
Humidity and Wind
Napa has below average humidity compared to most tourist destinations. The least humid month is September (33% relative humidity), and the most humid month is December (64.1%).
Wind in Napa is usually moderate. The windiest month is May, followed by July and June. May’s average wind speed of around 6.3 knots (7.2 MPH or 11.7 KPH) is considered “light breeze.” Maximum sustained winds (the highest speed for the day lasting more than a few moments) are at their highest in late May where average top sustained speeds reach 13 knots, which is considered a moderate breeze.
Relative Humidity (%)
The graph below shows the average % humidity by month in Napa.
The graph below shows wind speed (max and average) in knots.
Average Wind Speeds
Show Wind Speeds
All wind speeds are in knots.
|Month||Avg. Wind||Meaning (Beaufort)||Avg. Maximum Sustained Wind||Meaning (Beufort)|
|Jan||2.8||light air||7.4||a gentle breeze|
|Feb||4.4||a light breeze||10||a gentle breeze|
|Mar||4.8||a light breeze||10.4||a gentle breeze|
|Apr||5.6||a light breeze||11.9||a moderate breeze|
|May||6.3||a light breeze||12.3||a gentle breeze|
|Jun||6||a light breeze||11.8||a moderate breeze|
|Jul||6.1||a light breeze||10.9||a gentle breeze|
|Aug||5.7||a light breeze||10.6||a gentle breeze|
|Sep||4.7||a light breeze||9.9||a gentle breeze|
|Oct||4||a light breeze||9.1||a gentle breeze|
|Nov||3.4||light air||8.3||a gentle breeze|
|Dec||3.6||light air||8.9||a gentle breeze|
Show Relative Humidity by Month
|Month||Avg. Relative Humidity|
Is it Safe to Travel to Napa?
As of 6/22/2017 there are no travel advisories or warnings for the United States; exercise normal security precautions. Check this page for any recent changes or regions to avoid: Travel Advice and Advisories.
The Busiest and Least Crowded Months
The busiest month for tourism in Napa, CA (USA) is July, followed by June and August. Prices for hotels and flights will be most expensive during these months, though you can save if you purchase well in advance. Tourists are unlikely to visit Napa in December. Those willing to visit at these times will likely find it the least expensive month.
Estimated Tourism by Month
Most Popular Months to Visit
Overall Napa Travel Experience by Season
Spring (March through May)
Humidity and temperatures combine to make this season feel moderate. Highs range from 58.3°F (14.6°C) and 47.7°F (8.7°C) with warmer temperatures in the later months. Rain is rare with 1 to 4 days of precipitation per month. Spring is busy for tourism, which makes it a good time for those looking for things to do.
Summer (June through August)
The middle-year months have very comfortable weather with high temperatures that are comfortable. These months see moderate precipitation with 0 to 1 days of precipitation per month. June – August is the busiest season for tourism in Napa, so lodging and other accommodations may cost more than usual.
Fall (September through November)
Fall daily highs range from 65.2°F (18.4°C) and 46.8°F (8.2°C), which will feel comfortable given the humidity and wind. It rains or snows a small amount: 0 to 4 days per month. Tourism is the slowest during these months due to the weather, so hotels may be lower priced.
Winter (December through February)
Weather is too cold this time of year in Napa to be enjoyable for warm weather travelers. The average high during this season is between 48.7°F (9.3°C) and 42.8°F (6°C). On average, it rains or snows a noticeable amount: 4 to 6 times per month. These times of year are fairly slow with tourists.