August weather forecastSan Anselmo, CA
August
Weather in August
In August, San Anselmo endures its warmest month with maximum temperatures reaching 71.2°F (21.8°C). The high heat comes with noticeable humidity of 76%. The long sunshine hours bode well for outdoor enthusiasts, despite a restraining reduction in daylight hours. The wind speed decreases a notch, offering limited relief from the summer temperatures. This drop in wind speed, coupled with minimal rainfall, results in calm, clear settings for most days.Temperature
In August, the average high-temperature in San Anselmo registers at a still agreeable 71.2°F (21.8°C), nearly identical to July's 70.5°F (21.4°C). An average nighttime temperature of 55.4°F (13°C) is observed during August.Humidity
In San Anselmo, the average relative humidity in August is 76%.Rainfall
The months with the least rainfall are June through September Rain falls for 1.2 days and accumulates 0.04" (1mm) of rain.Daylight
In San Anselmo, the average length of the day in August is 13h and 35min.On the first day of the month, sunrise is at 6:14 am and sunset at 8:18 pm. On the last day of August, sunrise is at 6:40 am and sunset at 7:40 pm PDT.
Sunshine
In San Anselmo, the average sunshine in August is 10.9h.UV index
The months with the highest UV index are April, June through September, with an average maximum UV index of 5. A UV Index reading of 3 to 5 represents a moderate health risk from exposure to the Sun's UV radiation for average individuals.Note: The UV index of 5 in August translates into these instructions:
Take heed. Individuals of lighter complexion can be burned in less than half an hour. To prevent harmful UV exposure, minimize direct contact with the Sun around midday. Experience reduced UV exposure by about half when donning a wide-brim hat.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in August
San Anselmo, CA
- Average high temperature in August: 71.2°F
The warmest month (with the highest average high temperature) is September (72.3°F).
The month with the lowest average high temperature is December (55.4°F).
- Average low temperature in August: 55.4°F
The month with the highest average low temperature is September (56.1°F).
The coldest month (with the lowest average low temperature) is December (45.3°F).
Average pressure in August
San Anselmo, CA
- Average pressure in August: 29.92"Hg
The month with the highest atmospheric pressure is January (30.13"Hg).
The months with the lowest atmospheric pressure are June, August and September (29.92"Hg).
Average wind speed in August
San Anselmo, CA
- Average wind speed in August: 6.4mph
The windiest month (with the highest average wind speed) is May (7.8mph).
The calmest months (with the lowest average wind speed) are October and November (5.5mph).
Average humidity in August
San Anselmo, CA
- Average humidity in August: 76%
The month with the highest relative humidity is March (77%).
The month with the lowest relative humidity is October (68%).
Average rainfall in August
San Anselmo, CA
- Average rainfall in August: 0.04"
The wettest month (with the highest rainfall) is February (0.87").
The driest months (with the least rainfall) are June, July, August and September (0.04").
Average rainfall days in August
San Anselmo, CA
- Average rainfall days in August: 1.2 days
The month with the highest number of rainy days is March (8.8 days).
The months with the least rainy days are June and August (1.2 days).
Average daylight in August /
Average sunshine in August
San Anselmo, 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: 10h and 54min
The month with the most sunshine is July (Average sunshine: 11h and 12min).
The month with the least sunshine is December (Average sunshine: 5h and 30min).
Average sunshine days in August
San Anselmo, CA
- Average sunshine days in August: 24.8 days
The month with the most sunshine days is June (26.4 days).
The month with the least sunshine days is March (20.7 days).
Average UV index in August
San Anselmo, CA
- Average UV index in August: 5
The months with the highest UV index are April, June, July, August and September (UV index 5).
The months with the lowest UV index are January, February, November and December (UV index 3).
Average cloud cover in August
San Anselmo, CA
- Average cloud cover in August: 25
The month with the most cloud cover is March (Cloud cover 39).
The month with the least cloud cover is September (Cloud cover 19).
Average visibility in August
San Anselmo, 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).
