May weather forecastPort Costa, CA
May
Weather in May
May, the last month of the spring in Port Costa, is a pleasant month, with an average temperature varying between 71.1°F (21.7°C) and 49.8°F (9.9°C).Temperature
Port Costa's weather, upon May's arrival, documents an average high-temperature of an agreeable 71.1°F (21.7°C), nearly identical to the prior month. Port Costa throughout May, experiences an average nighttime temperature of 49.8°F (9.9°C).Humidity
In Port Costa, the average relative humidity in May is 66%.Rainfall
In Port Costa, in May, it is raining for 3.6 days, with typically 0.28" (7mm) of accumulated precipitation. Throughout the year, in Port Costa, California, there are 56.9 rainfall days, and 4.88" (124mm) of precipitation is accumulated.Daylight
In May, the average length of the day is 14h and 15min.On the first day of the month, sunrise is at 6:11 am and sunset at 8:00 pm. On the last day of May, sunrise is at 5:47 am and sunset at 8:25 pm PDT.
Sunshine
The average sunshine in May is 10.8h.UV index
The average daily maximum UV index in May is 5. A UV Index estimate of 3 to 5 represents a medium vulnerability from unsafe exposure to UV radiation for the ordinary person.Note: The average daily UV index of 5 in May transforms into the following instructions:
Take precautions - Protection against skin and eye damage is obliged. Around midday, solar radiation is most harmful; hence, exposure should be limited. On sunny days, it's ideal to wear sunglasses that filter out UVA and UVB rays.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in May
Port Costa, CA
- Average high temperature in May: 71.1°F
The warmest months (with the highest average high temperature) are July and September (80.1°F).
The month with the lowest average high temperature is December (55.4°F).
- Average low temperature in May: 49.8°F
The month with the highest average low temperature is August (56.5°F).
The coldest month (with the lowest average low temperature) is January (43°F).
Average pressure in May
Port Costa, CA
- Average pressure in May: 29.97"Hg
The month with the highest atmospheric pressure is January (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.91"Hg).
Average wind speed in May
Port Costa, CA
- Average wind speed in May: 7.1mph
The windiest month (with the highest average wind speed) is May (7.1mph).
The calmest month (with the lowest average wind speed) is November (4.6mph).
Average humidity in May
Port Costa, CA
- Average humidity in May: 66%
The month with the highest relative humidity is March (75%).
The months with the lowest relative humidity are September and October (60%).
Average rainfall in May
Port Costa, CA
- Average rainfall in May: 0.28"
The wettest month (with the highest rainfall) is February (1.14").
The driest months (with the least rainfall) are July and August (0.04").
Average rainfall days in May
Port Costa, CA
- Average rainfall days in May: 3.6 days
The month with the highest number of rainy days is March (10.2 days).
The month with the least rainy days is August (0.9 days).
Average daylight in May /
Average sunshine in May
Port Costa, CA
- Average daylight in May: 14h and 12min
The month with the longest days is June (Average daylight: 14h and 48min).
The month with the shortest days is December (Average daylight: 9h and 36min).
- Average sunshine in May: 10h and 48min
The month with the most sunshine is July (Average sunshine: 12h and 0min).
The month with the least sunshine is December (Average sunshine: 5h and 42min).
Average sunshine days in May
Port Costa, CA
- Average sunshine days in May: 24.3 days
The month with the most sunshine days is July (27.2 days).
The month with the least sunshine days is March (18.8 days).
Average UV index in May
Port Costa, CA
- Average UV index in May: 5
The month with the highest UV index is June (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 3).
Average cloud cover in May
Port Costa, CA
- Average cloud cover in May: 24
The month with the most cloud cover is March (Cloud cover 37).
The month with the least cloud cover is July (Cloud cover 9).
Average visibility in May
Port Costa, CA
- Average visibility in May: 6mi
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
