August weather forecast and climate
Grass Valley, CA

Weather in August

August, the last month of the summer, in Grass Valley, is another tropical month, with temperature in the range of an average low of 59.2°F (15.1°C) and an average high of 89.2°F (31.8°C).

Temperature

In Grass Valley, the average high-temperature in August is almost the same as in July - a still hot 89.2°F (31.8°C). In Grass Valley, California, the average low-temperature is 59.2°F (15.1°C).

Humidity

The average relative humidity in August is 38%.

Rainfall

Months with the least rainfall in Grass Valley are July and August Rain falls for 1.2 days and accumulates 0.04" (1mm) of rain.

Snowfall

June through October are months without snowfall in Grass Valley.

Daylight

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

Sunshine

In Grass Valley, California, the average sunshine is 12h.

UV index

The average daily maximum UV index in August is 6. A UV Index of 6 to 7 symbolizes a high threat to health from unsafe exposure to the UV radiation for the average person.
Note: The average daily UV index of 6 transform into the following instructions:
Take precautions and utilize sun safety practices. Protection against the skin and eye damage is required. Seek shade and minimize exposure to direct Sun in a period between 10 a.m. and 4 p.m. when UV radiation is most intense; keep in mind that shade structures like parasols or canopies do not provide perfect sun protection. 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 Grass Valley?

The average high-temperature, in August, is 89.2°F (31.8°C), while the average low-temperature is 59.2°F (15.1°C).

What is the average humidity in August in Grass Valley?

In Grass Valley, the average relative humidity in August is 38%.

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

In August, the rain falls for 1.2 days. Throughout August, 0.04" (1mm) of precipitation is accumulated.

What is the driest month in Grass Valley?

Months with the least rainfall in Grass Valley, California, are July and August Rain falls for 1.2 days and accumulates 0.04" (1mm) of rain.

When it does not snow in Grass Valley?

June through October are months without snowfall.

How many hours of daylight does Grass Valley have in August?

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

How long on average sun shines in August in Grass Valley?

The average sunshine in August in Grass Valley, California, is 12h.

What is the UV index intensity in August in Grass Valley?

In August, the average daily maximum UV index in Grass Valley, California, is 6. A UV Index value of 6 to 7 symbolizes a high health threat from the exposure to the Sun's UV radiation.

Average temperature in August
Grass Valley, CA

Average temperature in August - Grass Valley, CA
  • Average high temperature in August: 89.2°F

The warmest month (with the highest average high temperature) is July (90.1°F).
The month with the lowest average high temperature is December (51.3°F).

  • Average low temperature in August: 59.2°F

The month with the highest average low temperature is July (60.1°F).
The coldest month (with the lowest average low temperature) is December (37.2°F).

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Average pressure in August
Grass Valley, CA

Average pressure in August - Grass Valley, CA
  • Average pressure in August: 29.91"

The month with the highest atmospheric pressure is January (30.17").
The month with the lowest atmospheric pressure is June (29.9").

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Average wind speed in August
Grass Valley, CA

Average wind speed in August - Grass Valley, CA
  • Average wind speed in August: 4.8mph

The windiest month (with the highest average wind speed) is February (6mph).
The calmest month (with the lowest average wind speed) is August (4.8mph).

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Average humidity in August
Grass Valley, CA

Average humidity in August - Grass Valley, CA
  • Average humidity in August: 38%

The month with the highest relative humidity is March (75%).
The month with the lowest relative humidity is July (37%).

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Average rainfall in August
Grass Valley, CA

Average rainfall in August - Grass Valley, CA
  • Average rainfall in August: 0.04"

The wettest month (with the highest rainfall) is March (6.57").
The driest months (with the least rainfall) are July and August (0.04").

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Average rainfall days in August
Grass Valley, CA

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

The month with the highest number of rainy days is March (15.1 days).
The month with the least rainy days is July (1.1 days).

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Average snowfall in August
Grass Valley, CA

Average snowfall in August - Grass Valley, CA
  • Average snowfall in August: 0"

The month with the highest snowfall is February (6.42").
Months with the least snowfall are June, July, August, September and October (0").

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Average snowfall days in August
Grass Valley, CA

Average snowfall days in August - Grass Valley, CA
  • Average snowfall days in August: 0 days

The month with the highest number of snowfall days is March (2.4 days).
Months with the least snowfall days are June, July, August, September and October (0 days).

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

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

The month with the longest days is June (Average daylight: 14.9h).
The month with the shortest days is December (Average daylight: 9.5h).

  • Average sunshine in August: 12h

The month with the most sunshine is July (Average sunshine: 12.2h).
The month with the least sunshine is January (Average sunshine: 5.7h).

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Average sunshine days in August
Grass Valley, CA

Average sunshine days in August - Grass Valley, CA
  • Average sunshine days in August: 28.7 days

The month with the most sunshine days is July (29.8 days).
The month with the least sunshine days is March (14.8 days).

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Average UV index in August
Grass Valley, CA

Average UV index in August - Grass Valley, CA
  • Average UV index in August: 6

The month with the highest UV index is July (UV index 7).
The month with the lowest UV index is November (UV index 2).

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Average cloud cover in August
Grass Valley, CA

Average cloud cover in August - Grass Valley, CA
  • Average cloud cover in August: 5

The month with the most cloud cover is March (Cloud cover 41).
The month with the least cloud cover is July (Cloud cover 4).

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Average visibility in August
Grass Valley, CA

Average visibility in August - Grass 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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