Napa

Napa Valley Weather in May

Average temperatures, rainfall, sunshine and the best places to visit in the Napa Valley, the United States of America in May.

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Napa Calistoga St. Helena Yountville

Are you planning a trip a to the Napa Valley, the United States of America in May and wondering what kind of weather to expect? This page has all the details you need.

What to Expect in the Napa Valley in May

The Napa Valley, the United States of America is a region in the United States of America. May in the Napa Valley generally has warm temperatures, with low precipitation.

Temperatures

The average maximum temperatures are warm and range from 23°C (73°F) in American Canyon to 26°C (79°F) in St. Helena. Nighttime temperatures generally drop to 10°C (50°F) in St. Helena and 9°C (48°F) in American Canyon.

To explore the conditions in the Napa Valley, the United States of America in more detail, check the map below.

Precipitation

In May, precipitation varies across different areas. From low rainfall in American Canyon with an average of 13 mm (0.5 in) to low rainfall in Calistoga with 24 mm (0.9 in).

Average sunshine

May brings good sunshine to many areas. Napa sees around 310 hours of sunlight, great for visitors looking for bright days.

Explore the Napa Valley by month

Pick a month to see the average temperature, rainfall and sunshine in the Napa Valley — and find the best time to visit. (based on Napa)

January15°C (59°F) February17°C (63°F) March19°C (66°F) April22°C (72°F) May25°C (77°F) June28°C (82°F) This monthJuly29°C (84°F) August29°C (84°F) September30°C (86°F) October26°C (79°F) November19°C (66°F) December14°C (57°F)
Best Time to Visit the Napa Valley →

Best Places to Visit in the Napa Valley in May

Click on a destination dot for more details. Toggle the map to compare temperatures or precipitation across the Napa Valley.

Conditions Temperatures Precipitation
perfect weather
pleasant
tolerable
unpleasant
poor

Perfect weather is subjective. On this map perfect weather has been defined with temperatures between 20°C (68°F) and 29°C (84°F) and not too much precipitation (less than 90 mm (3.5 in) a month).

Popular Destinations in the Napa Valley

What is the weather like in May for some of the most popular destinations in the Napa Valley, the United States of America?

Temperature range in the Napa Valley (May)

Precipitation variation in the Napa Valley (May)

Napa

In May Napa generally has high temperatures with maximum daytime temperatures around 25°C (77°F), minimum nighttime temperatures around 10°C (50°F) and low monthly rainfall. So on average the conditions are perfect that month.

« April
May
June »
April
May
June
Max temperature
22°C (72°F)
25°C (77°F)
28°C (82°F)
Min temperature
7°C (45°F)
10°C (50°F)
12°C (54°F)
Monthly sun hours
305 hours
310 hours
305 hours
Monthly rainfall
50 mm (2 in)
16 mm (0.6 in)
7.5 mm (0.3 in)
Monthly rainy days
7 days
3 days
a single day
Weather conditions
perfect
perfect
perfect
Climate in Napa →

Calistoga

In May Calistoga generally has high temperatures with maximum daytime temperatures around 25°C (77°F), minimum nighttime temperatures around 9°C (48°F) and low monthly rainfall. So on average the conditions are perfect that month.

« April
May
June »
April
May
June
Max temperature
21°C (70°F)
25°C (77°F)
30°C (86°F)
Min temperature
7°C (45°F)
9°C (48°F)
11°C (52°F)
Monthly sun hours
305 hours
310 hours
305 hours
Monthly rainfall
70 mm (2.8 in)
24 mm (0.9 in)
9.6 mm (0.4 in)
Monthly rainy days
8 days
4 days
2 days
Weather conditions
perfect
perfect
perfect
Climate in Calistoga →

St. Helena

In May St. Helena generally has high temperatures with maximum daytime temperatures around 26°C (79°F), minimum nighttime temperatures around 10°C (50°F) and low monthly rainfall. So on average the conditions are perfect that month.

« April
May
June »
April
May
June
Max temperature
22°C (72°F)
26°C (79°F)
30°C (86°F)
Min temperature
8°C (46°F)
10°C (50°F)
12°C (54°F)
Monthly sun hours
305 hours
310 hours
305 hours
Monthly rainfall
56 mm (2.2 in)
21 mm (0.8 in)
8.5 mm (0.3 in)
Monthly rainy days
8 days
4 days
a single day
Weather conditions
perfect
perfect
perfect
Climate in St. Helena →

Yountville

In May Yountville generally has high temperatures with maximum daytime temperatures around 25°C (77°F), minimum nighttime temperatures around 10°C (50°F) and low monthly rainfall. So on average the conditions are perfect that month.

« April
May
June »
April
May
June
Max temperature
22°C (72°F)
25°C (77°F)
29°C (84°F)
Min temperature
7°C (45°F)
10°C (50°F)
11°C (52°F)
Monthly sun hours
305 hours
310 hours
305 hours
Monthly rainfall
53 mm (2.1 in)
19 mm (0.7 in)
6.5 mm (0.3 in)
Monthly rainy days
7 days
4 days
a single day
Weather conditions
perfect
perfect
perfect
Climate in Yountville →

American Canyon

In May American Canyon generally has high temperatures with maximum daytime temperatures around 23°C (73°F), minimum nighttime temperatures around 9°C (48°F) and low monthly rainfall. So on average the conditions are perfect that month.

« April
May
June »
April
May
June
Max temperature
20°C (68°F)
23°C (73°F)
26°C (79°F)
Min temperature
7°C (45°F)
9°C (48°F)
11°C (52°F)
Monthly sun hours
310 hours
324 hours
312 hours
Monthly rainfall
48 mm (1.9 in)
13 mm (0.5 in)
5.4 mm (0.2 in)
Monthly rainy days
7 days
3 days
a single day
Weather conditions
perfect
perfect
perfect
Climate in American Canyon →

Is your destination not in the list? Have a look at all destinations in the Napa Valley, in the United States of America.

Popular cities in May

Day & night temperatures, rainfall and average weather in the Napa Valley in May.

City Weather Day temp Night temp Rainfall
Napa 25°C (77°F) 10°C (50°F) 16 mm (0.6 in)
Calistoga 25°C (77°F) 9°C (48°F) 24 mm (0.9 in)
St. Helena 26°C (79°F) 10°C (50°F) 21 mm (0.8 in)
Yountville 25°C (77°F) 10°C (50°F) 19 mm (0.7 in)
American Canyon 23°C (73°F) 9°C (48°F) 13 mm (0.5 in)

The Napa Valley weather in May: frequently asked questions

What is the weather like in the Napa Valley, the United States of America in May?

the Napa Valley, the United States of America typically experiences perfect weather in May, part of the season. Daytime highs in Napa average around 25°C (77°F), and temperatures drop to about 10°C (50°F) at night.

What is the average temperature in the Napa Valley, the United States of America in May?

Daytime temperatures in Napa peak at roughly 25°C (77°F) in May, dropping to about 10°C (50°F) overnight.

Does the Napa Valley, the United States of America get a lot of rain in May?

May is on the drier side in the Napa Valley, the United States of America. Napa averages only about 16 mm (0.6 in), with most days staying dry.

Is May a Good Time to Visit the Napa Valley, the United States of America?

We believe that May is one of the best times to visit the Napa Valley, the United States of America with overall perfect weather in Napa.

Generally speaking, April, May, June, July, August and October provide perfect weather in Napa. The weather in February and December, on the other hand, tends to be unpleasant.

Interested in more climate information?

We have much more information about the climate in the Napa Valley.

Weather and climate has detailed information for every country in the world. Are you going to the United States of America? Get detailed historical weather averages for many cities in the United States of America.

Not sure yet where to go? We now have a tool which recommends destinations that suit your ideal travel conditions. Find out where to go with our weather planner.

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