August weather forecast and climate
Sun Valley, CA

Weather in August

The last month of the summer, August, is a hot month in Sun Valley, California, with temperature in the range of an average low of 64.8°F (18.2°C) and an average high of 86.5°F (30.3°C).

Temperature

The warmest month is August, with an average high-temperature of 86.5°F (30.3°C) and an average low-temperature of 64.8°F (18.2°C).

Heat index

In August, the average heat index is calculated to a hot 89.1°F (31.7°C). Constant exposure and activity lead to possible fatigue. Prolonged exercise may result in heat cramps.
Take into consideration that the heat index values are calculated for shade and light wind conditions. With the exposure to direct sunlight, the heat index may be increased by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'felt air temperature', 'real feel', 'apparent temperature', or 'feels like', is what the temperature feels like to the human body when the air temperature is combined with the relative humidity. This effect is subjective, depending on the activity and individual's heat perception influenced by various reasons (clothing, metabolic differences, pregnancy). Be aware that direct exposure to sunlight increases heat impact, and may raise the heat index additionally, by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly important for children. Children are often less aware of the need to rest and re-hydrate. Thirst is a late sign of dehydration - it is vital to remain hydrated, particularly during prolonged physical activities.

Humidity

In August, the average relative humidity in Sun Valley is 51%.

Rainfall

In Sun Valley, California, in August, it is raining for 1.7 days, with typically 0.12" (3mm) of accumulated precipitation. Throughout the year, there are 40.1 rainfall days, and 5.87" (149mm) of precipitation is accumulated.

Daylight

The average length of the day in Sun Valley, California, is 13.4h.

Sunshine

June through August, with an average of 12.1h of sunshine, are months with the most sunshine in Sun Valley, California.

UV index

Months with the highest UV index in Sun Valley are June through September, with an average maximum UV index of 6. A UV Index reading of 6 to 7 represents a high threat to health from the exposure to the Sun's UV radiation for average individuals.
Note: The daily maximum UV index of 6 in August interpret into the following advice:
Take precautions and adopt sun safety practices. Protection against sunburn is obliged. The Sun's UV radiation is most powerful between 10 a.m. and 4 p.m. To the extent possible, limit exposure to the direct sun during these hours. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes.
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FAQ

What is the warmest month in Sun Valley?

With an average high-temperature of 86.5°F (30.3°C) and an average low-temperature of 64.8°F (18.2°C), August is the warmest month in Sun Valley, California.

What is the temperature in August in Sun Valley?

The average high-temperature, in August, in Sun Valley, is 86.5°F (30.3°C), while the average low-temperature is 64.8°F (18.2°C). In August, the average heat index (a.k.a. 'apparent temperature', 'feels like'), that calculates temperature value influenced by the moisture in the air, is calculated to 89.1°F (31.7°C).

What is the average humidity in August in Sun Valley?

In August, the average relative humidity is 51%.

How much does it rain in Sun Valley in August?

In Sun Valley, in August, it is raining for 1.7 days, with typically 0.12" (3mm) of accumulated precipitation.

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

The average length of the day in August in Sun Valley, California, is 13.4h.

What are the months with the most sunshine in Sun Valley?

June through August, with an average of 12.1h of sunshine, are months with the most sunshine in Sun Valley.

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

The average sunshine in August in Sun Valley is 12.1h.

What are the months with the highest UV index in Sun Valley?

Months with the highest UV index are June through September, with an average maximum UV index of 6.

How high is the UV index in August in Sun Valley?

The average daily maximum UV index in August in Sun Valley is 6. A UV Index of 6 to 7 symbolizes a high health threat from the exposure to the Sun's UV rays.

Average temperature in August
Sun Valley, CA

Average temperature in August - Sun Valley, CA
  • Average high temperature in August: 86.5°F

The warmest month (with the highest average high temperature) is August (86.5°F).
The month with the lowest average high temperature is December (61.7°F).

  • Average low temperature in August: 64.8°F

The month with the highest average low temperature is August (64.8°F).
The coldest month (with the lowest average low temperature) is December (46.2°F).

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Average pressure in August
Sun Valley, CA

Average pressure in August - Sun Valley, CA
  • Average pressure in August: 29.9"

The month with the highest atmospheric pressure is January (30.11").
The month with the lowest atmospheric pressure is June (29.88").

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Average wind speed in August
Sun Valley, CA

Average wind speed in August - Sun Valley, CA
  • Average wind speed in August: 4.5mph

The windiest month (with the highest average wind speed) is April (5.9mph).
The calmest month (with the lowest average wind speed) is September (4.4mph).

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Average humidity in August
Sun Valley, CA

Average humidity in August - Sun Valley, CA
  • Average humidity in August: 51%

The month with the highest relative humidity is June (59%).
The month with the lowest relative humidity is November (48%).

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Average rainfall in August
Sun Valley, CA

Average rainfall in August - Sun Valley, CA
  • Average rainfall in August: 0.12"

The wettest month (with the highest rainfall) is December (1.18").
The driest month (with the least rainfall) is June (0.04").

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Average rainfall days in August
Sun Valley, CA

Average rainfall days in August - Sun Valley, CA
  • Average rainfall days in August: 1.7 days

The month with the highest number of rainy days is March (5.2 days).
The month with the least rainy days is June (1 days).

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

Average daylight in August / Average sunshine in August - Sun Valley, CA
  • Average daylight in August: 13.4h

The month with the longest days is June (Average daylight: 14.4h).
The month with the shortest days is December (Average daylight: 9.9h).

  • Average sunshine in August: 12.1h

Months with the most sunshine are June, July and August (Average sunshine: 12.1h).
Months with the least sunshine are January, February and December (Average sunshine: 6.9).

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Average sunshine days in August
Sun Valley, CA

Average sunshine days in August - Sun Valley, CA
  • Average sunshine days in August: 26.3 days

The month with the most sunshine days is October (27.1 days).
The month with the least sunshine days is February (22.9 days).

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Average UV index in August
Sun Valley, CA

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

Months with the highest UV index are June, July, August and September (UV index 6).
The month with the lowest UV index is December (UV index 3).

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Average cloud cover in August
Sun Valley, CA

Average cloud cover in August - Sun Valley, CA
  • Average cloud cover in August: 4

Months with the most cloud cover are March and December (Cloud cover 21).
The month with the least cloud cover is August (Cloud cover 4).

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Average visibility in August
Sun Valley, CA

Average visibility in August - Sun 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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