August weather forecast and climate
Mill Valley, CA

Weather in August

The last month of the summer, August, is another pleasant month in Mill Valley, California, with average temperature varying between 71.2°F (21.8°C) and 55.4°F (13°C).

Temperature

In August, the average high-temperature is almost the same as in July - a still pleasant 71.2°F (21.8°C). In Mill Valley, in August, the average low-temperature is 55.4°F (13°C).

Humidity

In August, the average relative humidity is 76%.

Rainfall

Months with the least rainfall are June through September Rain falls for 1.2 days and accumulates 0.04" (1mm) of rain.

Daylight

The average length of the day in August is 13.6h.

Sunshine

In August, the average sunshine is 10.9h.

UV index

Months with the highest UV index in Mill Valley are April, June through September, with an average maximum UV index of 5. A UV Index value of 3 to 5 symbolizes a medium vulnerability from unsafe exposure to the UV radiation for ordinary individuals.
Note: The daily maximum UV index of 5 interpret into the following advice:
Take precautions - Protection against sunburn is recommended. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects.
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FAQ

What is the temperature in August in Mill Valley?

In August, in Mill Valley, California, the average high-temperature is 71.2°F (21.8°C), and the average low-temperature is 55.4°F (13°C).

What is the average humidity in August in Mill Valley?

The average relative humidity in August is 76%.

How many days does it rain in August in Mill Valley?

In Mill Valley, in August, during 1.2 rainfall days, 0.04" (1mm) of precipitation is typically accumulated.

What is the driest month in Mill Valley?

Months with the least rainfall in Mill Valley, California, are June through September Rain falls for 1.2 days and accumulates 0.04" (1mm) of rain.

What is the average length of the day in August in Mill Valley?

The average length of the day in August in Mill Valley is 13.6h.

How many hours of sunshine does Mill Valley have in August?

The average sunshine in August in Mill Valley is 10.9h.

What is the month with the highest UV index in Mill Valley?

Months with the highest UV index in Mill Valley are April, June through September, with an average maximum UV index of 5.

What is the UV index reading in August in Mill Valley?

The average daily maximum UV index in August in Mill Valley is 5. A UV Index value of 3 to 5 symbolizes a medium hazard to health from the exposure to the Sun's UV radiation.

Average temperature in August
Mill Valley, CA

Average temperature in August - Mill Valley, 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).

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Average pressure in August
Mill Valley, CA

Average pressure in August - Mill Valley, CA
  • Average pressure in August: 29.92"

The month with the highest atmospheric pressure is January (30.13").
Months with the lowest atmospheric pressure are June, August and September (29.92").

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Average wind speed in August
Mill Valley, CA

Average wind speed in August - Mill Valley, 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).

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Average humidity in August
Mill Valley, CA

Average humidity in August - Mill Valley, 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%).

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Average rainfall in August
Mill Valley, CA

Average rainfall in August - Mill Valley, 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").

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Average rainfall days in August
Mill Valley, CA

Average rainfall days in August - Mill Valley, CA
  • Average rainfall days in August: 1.2 days

The month with the highest number of rainy days is March (8.8 days).
Months with the least rainy days are June and August (1.2 days).

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Average daylight in August /
Average sunshine in August
Mill Valley, CA

Average daylight in August / Average sunshine in August - Mill Valley, CA
  • Average daylight in August: 13.6h

The month with the longest days is June (Average daylight: 14.8h).
The month with the shortest days is December (Average daylight: 9.6h).

  • Average sunshine in August: 10.9h

The month with the most sunshine is July (Average sunshine: 11.2h).
The month with the least sunshine is December (Average sunshine: 5.5h).

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Average sunshine days in August
Mill Valley, CA

Average sunshine days in August - Mill Valley, 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).

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Average UV index in August
Mill Valley, CA

Average UV index in August - Mill Valley, CA
  • Average UV index in August: 5

Months with the highest UV index are April, June, July, August and September (UV index 5).
Months with the lowest UV index are January, February, November and December (UV index 3).

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Average cloud cover in August
Mill Valley, CA

Average cloud cover in August - Mill Valley, 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).

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Average visibility in August
Mill Valley, CA

Average visibility in August - Mill Valley, CA
  • Average visibility in August: 6mi

Months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
Months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).

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