Napa Valley in may: average Weather, Temperature and Climate
Weather in Napa Valley in may 2026
The weather in Napa Valley in may comes from statistical datas on the past years. You can view the weather statistics for the whole month, but also navigating through the tabs for the beginning, the middle and the end of the month.
Average weather throughout may
very bad weather UV index: 6
Weather at 6am
56°F
Clear/Sunny
60% of time
25%
10%
4%
Weather at 12pm
76°F
Clear/Sunny
65% of time
20%
11%
4%
Weather at 6pm
65°F
Clear/Sunny
72% of time
19%
5%
4%
Weather at 3am
49°F
46%
30%
15%
5%
Evolution of daily average temperature and precipitation in Napa Valley in may
These charts show the evolution of average minimum/maximum temperatures as well as average daily precipitation volume in Napa Valley in may.
The climate of Napa Valley in may is very bad
the weather in Napa Valley in may is dry ; it does not rain often (1.3in of rainfall over 2 days).
The climate quite nice around this city may. The thermometer averaged maximum of 77°F. In the morning the temperature drops to 56°F. Thus, the mean temperature average on this month of may in Napa Valley is 67°F. These temperatures are far removed from those records observed in Napa Valley in may with a maximum record of 103°F in 2021 and a minimum record of 40°F in 2021. You can hope to have about 28 days with temperatures above 65°F, or 90% of the month. And about 5 days with temperatures up to 86°F.
On this month of may, day length in Napa Valley is generally 14:17. The sun rises at 04:58 and sets at 19:15.
With ideal weather conditions, this month is recommended to go in this city in United States.
Seasonal average climate and temperature of Napa Valley in may
Check below seasonal norms These datas are set from the weather statements earlier years of may.
| May | |||||
| Outside temperature | |||||
| Average temperature | 67°F | ||||
| Highest temperature | 77°F | ||||
| Lowest temperature | 56°F | ||||
| Highest record temperature | 103°F (2021) | ||||
| Lowest record temperature | 40°F (2021) | ||||
| Number of days at +86°F | 5 day(s) (16%) | ||||
| Number of days at +65°F | 28 day(s) (90%) | ||||
| Wind | |||||
| Wind speed | 16km/h | ||||
| Wind temperature | 56°F | ||||
| Precipitation (rainfall) | |||||
| Rainfall | 1.3in | ||||
| Number of days with rainfall | 2 day(s) (6%) | ||||
| Record daily rainfall | 1.5in (2019) | ||||
| Other climate data | |||||
| Humidity | 70% | ||||
| Visibility | 9.16km | ||||
| Cloud cover | 22% | ||||
| UV index | 6 | ||||
| Daily sunshine hours | 14 | ||||
| Sunrise and sunset | |||||
| Time of sunrise | 04:58 | ||||
| Time of sunset | 19:15 | ||||
| Length of day | 14:17 | ||||
| Our opinion about the weather in may | |||||
| Our opinion at whereandwhen.net | very bad |
How was the weather last may?
Here is the day by day recorded weather in Napa Valley in may 2025:
47°F to 68°F
49°F to 65°F
50°F to 67°F
47°F to 76°F
63°F to 79°F
56°F to 76°F
50°F to 70°F
50°F to 77°F
50°F to 83°F
49°F to 81°F
47°F to 65°F
50°F to 61°F
47°F to 65°F
49°F to 70°F
49°F to 72°F
52°F to 79°F
52°F to 70°F
52°F to 76°F
56°F to 83°F
54°F to 79°F
50°F to 81°F
50°F to 74°F
47°F to 72°F
50°F to 74°F
49°F to 63°F
54°F to 74°F
50°F to 81°F
50°F to 72°F
54°F to 85°F
56°F to 90°F
56°F to 83°F
Map: other cities in California in may
Cities near Napa Valley:
| Bodega Bay in may | very bad weather |
| Stinson Beach in may | very bad weather |
| Jenner in may | very bad weather |
| Golden Gate National Recreation Area in may | very bad weather |
| Point Reyes in may | very bad weather |
| Oakland in may | very bad weather |
| San Francisco in may | very bad weather |
| Timber Cove in may | very bad weather |
| Sacramento in may | very bad weather |
| Sea Ranch in may | very bad weather |
| Moss Beach in may | very bad weather |
| Gualala in may | very bad weather |
Click over cities on the map for information about the weather in may.
Weather data for Napa Valley in may:
Weather data for Napa Valley for may are derived from an average of the weather forecast since 2009 in Napa Valley. There is a margin of error and these forecasts are to be considered as general information only. The weather in Napa Valley can vary slightly from year to year, but this data should limit surprises. So you can pack your bags or check for the best time in year to go to Napa Valley.