August weather forecastPortola, CA
August
Weather in August
August, the last month of the summer in Portola, is also a moderately hot month, with an average temperature varying between 46°F (7.8°C) and 81.1°F (27.3°C).Temperature
The transition into August notes an average high-temperature of a still warm 81.1°F (27.3°C), revealing a mild distinction from the 82.9°F (28.3°C) in July. Portola's August nights see a large temperature deviation, with temperatures resting at a low of 46°F (7.8°C).Heat index
During August, the heat index is computed to be 80.6°F (27°C). With prolonged exposure and constant activity, one might feel exhausted and experience heat cramps.Consider that heat index readings are for situations in the shade and light wind. Heat index values have the potential to be boosted by 15 Fahrenheit (8 Celsius) degrees due to direct sunlight.
Note: The heat index, also known as 'felt air temperature' or 'apparent temperature', is a numerical representation of warmth when taking temperature and moisture levels into account. A person's impression of weather can be shaped by several aspects, among them metabolic variations, pregnancy, and levels of physical activity. Take note that direct exposure to the sun can increase the felt temperature, possibly adding 15 Fahrenheit (8 Celsius) degrees to the heat index. Heat index values are particularly meaningful for babies and toddlers. Young people are generally more susceptible than adults because they perspire less. Furthermore, their proportionally larger skin surface to their petite bodies and the increased heat output from their actions add to the risk.
Humidity
July and August, with an average relative humidity of 40%, are the least humid months.Rainfall
The month with the least rainfall is August, when the rain falls for 3.4 days and typically collects 0.2" (5mm) of precipitation.Snowfall
In Portola, snow does not fall in July and August.Daylight
The average length of the day in August is 13h and 41min.On the first day of the month, sunrise is at 6:01 am and sunset at 8:14 pm. On the last day of August, sunrise is at 6:29 am and sunset at 7:34 pm PDT.
Sunshine
In Portola, the average sunshine in August is 11.8h.UV index
The months with the highest UV index are June through August, with an average maximum UV index of 5. A UV Index estimate of 3 to 5 represents a moderate health risk from unsafe exposure to UV radiation for average individuals.Note: The UV index of 5 in August translates into these instructions:
Put precautions into practice - Ensuring skin and eye safety is a necessity. Direct exposure to the Sun during its peak hours around mid-day should be minimized for safety. Sunglasses that guard against UVA and UVB rays are pivotal in minimizing sun-induced ocular damage.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in August
Portola, CA
- Average high temperature in August: 81.1°F
The warmest month (with the highest average high temperature) is July (82.9°F).
The month with the lowest average high temperature is December (37.2°F).
- Average low temperature in August: 46°F
The month with the highest average low temperature is July (47.5°F).
The coldest month (with the lowest average low temperature) is December (21.6°F).
Average pressure in August
Portola, CA
- Average pressure in August: 29.91"Hg
The month with the highest atmospheric pressure is January (30.19"Hg).
The month with the lowest atmospheric pressure is June (29.9"Hg).
Average wind speed in August
Portola, CA
- Average wind speed in August: 5.2mph
The windiest month (with the highest average wind speed) is March (6.6mph).
The calmest months (with the lowest average wind speed) are August and September (5.2mph).
Average humidity in August
Portola, CA
- Average humidity in August: 40%
The months with the highest relative humidity are January and March (81%).
The months with the lowest relative humidity are July and August (40%).
Average rainfall in August
Portola, CA
- Average rainfall in August: 0.2"
The wettest month (with the highest rainfall) is March (4.02").
The driest month (with the least rainfall) is August (0.2").
Average rainfall days in August
Portola, CA
- Average rainfall days in August: 3.4 days
The month with the highest number of rainy days is May (11.8 days).
The month with the least rainy days is July (3.3 days).
Average snowfall in August
Portola, CA
- Average snowfall in August: 0"
The month with the highest snowfall is December (22.52").
The months with the least snowfall are July and August (0").
Average snowfall days in August
Portola, CA
- Average snowfall days in August: 0 days
The month with the highest number of snowfall days is March (14.7 days).
The months with the least snowfall days are July and August (0 days).
Average daylight in August /
Average sunshine in August
Portola, CA
- Average daylight in August: 13h and 42min
The month with the longest days is June (Average daylight: 14h and 54min).
The month with the shortest days is December (Average daylight: 9h and 24min).
- Average sunshine in August: 11h and 48min
The month with the most sunshine is July (Average sunshine: 12h and 0min).
The month with the least sunshine is January (Average sunshine: 5h and 0min).
Average sunshine days in August
Portola, CA
- Average sunshine days in August: 26 days
The month with the most sunshine days is August (26 days).
The month with the least sunshine days is March (11.8 days).
Average UV index in August
Portola, CA
- Average UV index in August: 5
The months with the highest UV index are June, July and August (UV index 5).
The month with the lowest UV index is November (UV index 1).
Average cloud cover in August
Portola, CA
- Average cloud cover in August: 8
The month with the most cloud cover is March (Cloud cover 47).
The month with the least cloud cover is July (Cloud cover 7).
Average visibility in August
Portola, CA
- Average visibility in August: 6mi
The months with the highest visibility are May, June, July, August, September, October and November (6mi).
The months with the lowest visibility are January and December (4mi).
