Napa Weather in May: Temperature, Precipitation, Wind
Napa, United States in May experiences a mild Mediterranean climate characterized by warm days and cool nights. The average temperature hovers around 14.8°C (58.6°F), with daytime highs reaching 20.2°C (68.4°F) and nighttime lows dipping to 10.6°C (51.2°F). The region’s famous vineyards and wineries benefit from these temperature fluctuations, which contribute to the development of complex flavors in the grapes.
Precipitation in Napa during May is relatively low, with an average of 0.53 mm (0.02 inches) of rainfall. Rain occurs on approximately 8 days throughout the month, with a 25.8% probability of precipitation on any given day. The most common form of precipitation is rain, and visitors to popular attractions like the Napa Valley Wine Train or the Oxbow Public Market will likely encounter mostly dry conditions.
Wind patterns in Napa during May feature average wind speeds of 25.6 km/h (15.9 mph), with gusts reaching up to 35.6 km/h (22.1 mph). These breezes help moderate temperatures and contribute to the region’s pleasant climate. Atmospheric pressure remains steady at 1013.4 hPa, typical for sea-level locations.
Cloud cover in Napa averages 49.8% during May, resulting in partly cloudy conditions for much of the month. The region enjoys excellent visibility, averaging 15.3 km (9.5 miles), which allows for stunning views of the surrounding vineyards and rolling hills. UV index levels are high, reaching an average of 9.1, necessitating sun protection for outdoor activities such as wine tasting at renowned establishments like Robert Mondavi Winery or Beringer Vineyards.
Humidity levels in Napa during May average 74.3%, contributing to the region’s comfortable feel. The “feels like” temperature closely mirrors the actual temperature, with an average of 14.7°C (58.5°F). Sunrise occurs around 5:58 AM, while sunset takes place at approximately 8:14 PM, providing ample daylight hours for exploring the picturesque Napa Valley.
What is the temperature in Napa in May?
Average air temperature in Napa is 14.8°C (58.6°F) in May. The outside temperature in Napa feels like 14.7°C (58.5°F) on a typical May day. The highest average temperature during sunny days is 20.2°C (68.4°F) and feels like 20.2°C (68.4°F). The lowest average temperature after dark is 10.6°C (51.2°F) which feels like 10.4°C (50.7°F).
How hot is Napa in May?
The hot temperature in May in Napa rises to 30.2°C (86.4°F) on sunny days with low cloud coverage and 74.3% humidity. During hottest days of May it feels like 30 °C (86°F). The average maximum temp in Napa is 20.2°C (86°F) during day time in May.
How cold is Napa in May?
The coldest temp in Napa in May drops to 5.9°C (42.6°F) during the cold nights. With 25.6km/h (15.9mph) winds and 74.3% humidity it feels like 5°C (41°F) on the coldest nights. The average minimum temperature is 10.6°C (51.2°F) during night time in May.
Does it rain in Napa in May?
Yes, it rains for 8 days in Napa, United States in May averaging 0.53 mm of precipitation. Napa has a 25.8% chance for rain throughout the entire month of May.
How much does it rain in Napa throughout May?
Napa has 0.53 mm (0.02 inch) of rain per day on average in May. It rains for an average of 8 days out of the entire month.
Is Napa windy in May?
The average speed of wind in Napa, United States during May is 25.6km/h (15.9mph) and average windgust is 35.6km/h (22.1mph). On some days in May wind can reach up to 34.9km/h (21.7mph).
What is the direction of the wind in Napa in May?
Most days of May the wind is blowing from Southwest direction in Napa.
What are the humidity levels in Napa in May?
The average humidity levels in Napa in May are 74.3%. Daily humidity levels in Napa range from 68.2% to 78% during May.
How many hours of daylight are in Napa in May?
Napa has 14 hours 15 minutes of daylight in May on average. Sunset and sunrise times gradually change throughout the month. Sunrise in Napa in May is at 5:58:22 and the sunset is at 20:13:59.
What is the cloud coverage in Napa in May?
Clouds cover 49.8% of the sky on average throughout May in Napa. The cloud coverage ranges from 6.9% to 91% depending on the day of the month.
What is the UV level in May in Napa?
The average UV index in Napa is 9.1 in May. UV levels change throughout the month and range from 3 to 10.
What is the solar radiation in Napa in May?
The average solar radiation is 274.2 W/m2 (Watts per square meter) in Napa during May. However solar radiation levels change throughout the month and range from 84.4 W/m2 to 352.7 W/m2.
What is the solar energy during May in Napa?
The average solar energy during May in Napa is 23.7 MJ/m2 (megajoules per square metre). Solar energy ranges from 7.2 MJ/m2, to 30.5 MJ/m2 during May.
Are there severe weather risks in Napa in May?
Yes, there is a 10% risk for severe weather in Napa, United States in May.
What is the air pressure in Napa in May?
On average the air pressure in Napa in May is 1013.4 mb (millibars). Throughout the month the sea level pressure ranges from 1007.9 mb to 1018.6 mb.
What is the visibility in Napa in May?
The average daylight visibility in Napa in May is 15.3 km (9.5 miles). Depending on the precipitation the visibility ranges from 12.5 km (7.8 miles) to 16 km (9.9 miles) throughout May.
What is the dew point in Napa in May?
The average dew point in Napa during May is 10°C (50°F).
Where is the data for Napa climate in May coming from?
The climate data for Napa, California, United States in May is collected from the following weather stations.
- VACAVILLE NUT TREE AIRPORT, CA US
- NAPA CO AIRPORT, CA US
- PETALUMA MUNICIPAL AIRPORT, CA US
- Oakville CA US CIMIS
- FW1058 American Canyon CA US
- FW7520 Sonoma CA US
- KAPC
- KDVO
- KVCB