Contents
- Weather in May
- Frequently asked questions
- Average temperature in May
- Average pressure in May
- Average wind speed in May
- Average humidity in May
- Average rainfall in May
- Average rainfall days in May
- Average daylight in May
- Average sunshine in May
- Average sunshine days in May
- Average UV index in May
- Average cloud cover in May
- Average visibility in May
Weather in May
Temperature
The beginning of May records an average high-temperature of an agreeable 71.1°F (21.7°C), marking a negligible difference from April's 66.7°F (19.3°C). Throughout May, an average low-temperature of 49.8°F (9.9°C) is experienced.Humidity
In May, the average relative humidity 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, there are 56.9 rainfall days, and 4.88" (124mm) of precipitation is accumulated.Daylight
In May, the average length of the day in Port Costa 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, in Port Costa, sunrise is at 5:47 am and sunset at 8:25 pm PDT.
Sunshine
In Port Costa, California, the average sunshine in May is 10.8h.UV index
The average daily maximum UV index in May is 5. A UV Index reading of 3 to 5 represents a medium health hazard from exposure to the Sun's UV radiation for the ordinary person.Note: In May, the maximum UV index of 5 translates into these guidelines:
Take care. Persons with lighter skin might suffer burns in less than 30 minutes. To prevent harmful UV exposure, minimize direct contact with the Sun around midday. Opt for tightly woven and loose clothing to enhance protection from the Sun.
Frequently asked questions
What are May temperatures in Port Costa?
What is the average humidity in May in Port Costa?
How many days does it rain in May in Port Costa?
How many hours of daylight does Port Costa have in May?
What time are sunrise and sunset in May in Port Costa?
How long on average sun shines in May in Port Costa?
What is the UV index reading in May in Port Costa?
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 1min
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 5min
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).
Port Costa, California, USA
Weather forecast for your location
2. Allow the app to use your location
