August weather forecastPort Costa, CA
August
Weather in August
August, the last month of the summer in Port Costa, is another warm month, with an average temperature fluctuating between 79.7°F (26.5°C) and 56.5°F (13.6°C).Temperature
As August takes its course, Port Costa's average high-temperature registers at a still moderately hot 79.7°F (26.5°C), closely aligning with the preceding month. Port Costa experiences a significant reduction from daytime highs with an average low-temperature of 56.5°F (13.6°C) in August.Humidity
The average relative humidity in August is 65%.Rainfall
July and August are months with the least rain when the rain falls for 0.9 days and typically aggregates up to 0.04" (1mm) of rain.Daylight
In August, the average length of the day is 13h and 35min.On the first day of the month, sunrise is at 6:12 am and sunset at 8:17 pm. On the last day of August, sunrise is at 6:38 am and sunset at 7:39 pm PDT.
Sunshine
The average sunshine in August is 11.9h.UV index
In Port Costa, the average daily maximum UV index in August is 5. A UV Index estimate of 3 to 5 represents a medium vulnerability from exposure to the Sun's UV rays for the average person.Note: The UV index of 5 during August leads to these advisories:
Proceed with care. Light skin individuals may be exposed to burns in fewer than 30 minutes. Midday Sun has the strongest UV rays, making it crucial to limit exposure and find shade. Opt for tightly woven and loose clothing to enhance protection from the Sun.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in August
Port Costa, CA
- Average high temperature in August: 79.7°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 August: 56.5°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 August
Port Costa, CA
- Average pressure in August: 29.92"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 August
Port Costa, CA
- Average wind speed in August: 6.2mph
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 August
Port Costa, CA
- Average humidity in August: 65%
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 August
Port Costa, CA
- Average rainfall in August: 0.04"
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 August
Port Costa, CA
- Average rainfall days in August: 0.9 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 August /
Average sunshine in August
Port Costa, CA
- Average daylight in August: 13h and 36min
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 August: 11h and 54min
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 August
Port Costa, CA
- Average sunshine days in August: 25.8 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 August
Port Costa, CA
- Average UV index in August: 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 August
Port Costa, CA
- Average cloud cover in August: 11
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 August
Port Costa, CA
- Average visibility in August: 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).
