August weather forecastHillsborough, CA
August
Weather in August
The last month of the summer, August, is also an agreeable month in Hillsborough, California, with temperature in the range of an average high of 69.4°F (20.8°C) and an average low of 56.5°F (13.6°C).Temperature
August reports an average high-temperature of a still pleasant 69.4°F (20.8°C), slightly varied from July's 69.6°F (20.9°C). Throughout August nights, Hillsborough registers an average low-temperature of 56.5°F (13.6°C).Humidity
The most humid month is August, with an average relative humidity of 78%.Rainfall
In Hillsborough, in August, it is raining for 3 days, with typically 0.12" (3mm) of accumulated precipitation. Throughout the year, there are 81.5 rainfall days, and 12.8" (325mm) of precipitation is accumulated.Daylight
The average length of the day in August is 13h and 34min.On the first day of the month, sunrise is at 6:14 am and sunset at 8:17 pm. On the last day of August, in Hillsborough, sunrise is at 6:39 am and sunset at 7:39 pm PDT.
Sunshine
In August, the average sunshine is 11.7h.UV index
The months with the highest UV index are June through September, with an average maximum UV index of 5. A UV Index value of 3 to 5 symbolizes a moderate threat to health from unprotected exposure to Sun's UV rays for average individuals.Note: The UV index of 5 during August translates into the following guidance:
Prioritize safety - Suggestions to prevent sun damage are offered. To guard against the harmful effects of the Sun, minimize exposure during midday. For a sun-safe wardrobe, go for clothes that are tightly woven and generously sized.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in August
Hillsborough, CA
- Average high temperature in August: 69.4°F
The warmest month (with the highest average high temperature) is September (70.2°F).
The month with the lowest average high temperature is December (55.6°F).
- Average low temperature in August: 56.5°F
The month with the highest average low temperature is September (56.8°F).
The coldest month (with the lowest average low temperature) is January (47.5°F).
Average pressure in August
Hillsborough, CA
- Average pressure in August: 29.93"Hg
The month with the highest atmospheric pressure is January (30.13"Hg).
The month with the lowest atmospheric pressure is September (29.92"Hg).
Average wind speed in August
Hillsborough, CA
- Average wind speed in August: 6.2mph
The windiest month (with the highest average wind speed) is April (8.3mph).
The calmest month (with the lowest average wind speed) is September (6.1mph).
Average humidity in August
Hillsborough, CA
- Average humidity in August: 78%
The month with the highest relative humidity is August (78%).
The month with the lowest relative humidity is October (70%).
Average rainfall in August
Hillsborough, CA
- Average rainfall in August: 0.12"
The wettest month (with the highest rainfall) is February (2.44").
The driest month (with the least rainfall) is July (0.08").
Average rainfall days in August
Hillsborough, CA
- Average rainfall days in August: 3 days
The month with the highest number of rainy days is March (12.8 days).
The months with the least rainy days are June and July (2.4 days).
Average daylight in August /
Average sunshine in August
Hillsborough, CA
- Average daylight in August: 13h and 36min
The month with the longest days is June (Average daylight: 14h and 42min).
The month with the shortest days is December (Average daylight: 9h and 36min).
- Average sunshine in August: 11h and 42min
The month with the most sunshine is July (Average sunshine: 11h and 48min).
The month with the least sunshine is December (Average sunshine: 5h and 48min).
Average sunshine days in August
Hillsborough, CA
- Average sunshine days in August: 22.4 days
The month with the most sunshine days is July (24.6 days).
The month with the least sunshine days is March (16.3 days).
Average UV index in August
Hillsborough, CA
- Average UV index in August: 5
The months with the highest UV index are June, July, August and September (UV index 5).
The months with the lowest UV index are February and December (UV index 3).
Average cloud cover in August
Hillsborough, CA
- Average cloud cover in August: 17
The month with the most cloud cover is March (Cloud cover 36).
The months with the least cloud cover are July and September (Cloud cover 15).
Average visibility in August
Hillsborough, 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).
