Napa Valley Weather Overview

What to Expect Each Month in Napa & Tips for the Best Times to Visit

Discover details about the Napa Valley weather for your wine tour in California. This section provides an overview of what to expect from the weather each month.

Napa is beautiful almost any time of year, but there are a few times of year when it's best to book your trip.

sunny day in napa

The sun is shining almost every day in late September

Best Times to Visit: September & October

I think the months of September and October are the best times of year to visit for two reasons.

The first reason is that the Napa Valley weather is beautiful this time of year. The days are warm and the evenings are cool, but not too cold.

The average highs in September reach the lower 80s and it only dips down to around the mid-50s at night. The average high in October is in the mid-70s and the lows are in the lower 50s.

The second reason I love this time of year here is because it's harvest time. The grapes are ripe and the vineyards are breathtaking.

In addition, the entire region is buzzing with activity and excitement. Some wineries also have harvest events which will add some fun to your overall experience,

Month by Month: Napa Valley Weather Overview

Although September and October are my favorite times to visit, the Napa Valley weather is beautiful most of the year. Here are the average high and low temperatures by month.

Highs Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
F 56 62 64 71 76 81 83 82 81 77 64 57
C 14 17 17 21 24 27 28 28 27 24 18 14

Lows Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
F 39 41 42 45 50 53 55 55 53 50 43 39
C 4 5 6 7 10 12 13 13 12 10 6 4

January, February and March

January, February and March are some of the coolest and rainiest times of the year. The Napa Valley weather for this time of year is around 60 degrees for the high and around 40 degrees for the low.

The rain is typically light, but constant and it can last for days. On average, it receives around 4 to 5 inches of rain each month during this time.

napa valley in february

This is a picture from a visit in February. This time of year the vines are still bare with no leaves or grapes.

However, I do enjoy visiting during this time of year because it's not as busy. The wineries are not very crowded and you can get a very personalized experience.

Hotel rates are lower this time of year, since it isn't as busy. It's also easier to get into some of Napa's finest restaurants.

April and May

The Napa Valley weather begins to warm up a little during the months of April and May. On average, the highs are in the low to mid 70s. At night, the lows are in the mid to upper 40s.

This is the time of year when the vines begin to show signs of life. The rain also slows down quite a bit and there is very little rain during this time of year.

It's also quiet yet here, as the heavy visitor traffic begins in the summer.

June, July, August and September

The summer and early fall months are when it really heats up here. July is usually the warmest and one of the busiest times of the year.

Highs during these months are in the low to mid 80s. At times, the temperatures will reach the 90s in the warmer July and August months. At night, it will typically cool down to the mid 50s.

napa valley in september

Cabernet Sauvignon grapes ripening in the warm sun in late September

There is also little to no rain during these months. Grapes start to change color in early August and harvest usually starts at the end of the month.

In September, harvest is in full swing with a flurry of picking activities. This is also the time of year when you will get some amazing photos.


October is, again, one of my favorite times of year. The Napa Valley weather this time of year is highs in the mid 70s and lows in the high 40s to low 50s.

You will also find very little rain in the month of October. This makes it a perfect time for the wineries to finish harvest and an amazing time to visit.

November and December

In November and December, the Napa Valley weather begins to cool down even more.

If you are planning your vacation in November, you'll find highs in the low 60s. The weather cools off to the mid 40s at night.

In December, it's even a little cooler. Highs in December are in the mid 50s and lows in the lower 40s.

This is also when the rainy season begins, so you'll run into a little more rain this time of year versus the drier summer and fall months. If you've visited Napa Valley before, this can be a great time to visit if you want to avoid some of the crowds.

You'll also find some great bargains in the December time frame as many of the wineries are clearing through stock for the new year.

What to Wear

The best way to prepare for your vacation is to bring along layers of clothing. It cools off quite a bit at night, so you'll want to make sure you have a light jacket and pants for the cool nights in the valley.

You'll also want to wear comfortable shoes, especially if you are planning on doing any winery tours. Most tours take you to the vineyard so you can get up close to the vines and grapes. You'll need some comfortable shoes to walk around and get as close as you can.

There typically isn't a lot of walking, but there is a lot of standing. Most wineries have a parking lot within steps of the front door of their wine tasting rooms. However, almost all of them are standing room only, so you will be on your feet a lot.

More Information

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