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The average temperature in Napa in May for a typical day ranges from a high of 74°F (23°C) to a low of 49°F (9°C). Some would describe the temperature to be mildly cool. The general area may also feel breezy.
For comparison, the hottest month in Napa, August, has days with highs of 87°F (31°C) and lows of 56°F (13°C). The coldest month, December has days with highs of 57°F (14°C) and lows of 41°F (5°C). This graph shows how an average day looks like in Napa in May based on historical data.
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In Napa in May, there's a 8% chance of rain on an average day. And on the average day it rains or snows, we get 0.39 in (9.9 mm) of precipitation. In more common terms of how much that is, some would describe it as light rain.
The wettest month in Napa is December where a typical day has a 28% chance of precipitation and gets 0.05 in (1.2 mm) of precipitation, while the dryest month in Napa is July where a typical day has a 0% chance of precipitation and gets 0.03 in (0.8 mm) of precipitation. These graphs show the probability of it raining/snowing in May and the amount of rainfall.
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The average day in Napa during May has 14.2 hours of daylight, with sunrise at 5:58 AM and sunset at 8:12 PM.
The day with the longest amount of daylight in Napa is June 19th with 14.8 hours while December 18th has the shortest amount of daylight with only 9.5 hours.
This graph shows the average amount of daylight in Napa in May based on historical data.
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We've collected the weather data for Napa during all other months of the year too:
Weather data for Napa was collected from the MERRA-2 project from NASA, which used a climate model combined with historical data from weather stations around the world to estimate what the conditions were like for every point on the Earth.
For all data based on historical data, we've averaged the data from the past 11 years (2010-2020). For example, for the hourly temperature at 10am, we've looked at the temperature at 10am on every day in May (e.g., May 1, May 2, etc. in 2010, 2011, etc.) and took the arithmetic mean. We did not smooth the data, so for example, our daily temperature line will have some randomness due to the fact that weather is random in the first place.
Get inspired for your trip to Napa with our curated itineraries that are jam-packed with popular attractions everyday! Check them out here: