August weather forecast and climate
Winnetka, CA

Weather in August

The last month of the summer, August, is another warm month in Winnetka, California, with average temperature varying between 85.6°F (29.8°C) and 64.8°F (18.2°C).

Temperature

The warmest month is August, with an average high-temperature of 85.6°F (29.8°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 88°F (31.1°C). Exhaustion is likely with prolonged exposure and activity. Sustaining activity may result in heat cramps.
Note that heat index values are valued for light wind and location in the shade. Exposure to direct sunshine can increase heat index values by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'real feel', 'felt air temperature', 'feels like', or 'apparent temperature', is a calculated temperature value of how hot it feels when the moisture in the air is factored in. This effect is individual, with diverse people perceiving weather differently for numerous reasons (differences in body mass, height, and shape, pregnancy, metabolic differences), and activity. 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 especially crucial for babies and toddlers. 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 Winnetka, California, is 52%.

Rainfall

In Winnetka, during August, the rain falls for 1.5 days and regularly aggregates up to 0.08" (2mm) of precipitation. In Winnetka, during the entire year, the rain falls for 42.7 days and collects up to 6.46" (164mm) of precipitation.

Snowfall

In Winnetka snow does not fall in January through November.

Daylight

In August, the average length of the day is 13.4h.

Sunshine

In Winnetka, the average sunshine is 12h.

UV index

June through September, with an average maximum UV index of 6, are months with the highest UV index in Winnetka, California. A UV Index reading of 6 to 7 represents a high health hazard from unprotected exposure to the Sun's UV rays for the ordinary person.
Note: The average daily UV index of 6 transform into the following instructions:
Take precautions against overexposure. Fair-skinned people may get burned in less than 20 minutes. 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. A wide-brim hat offers excellent sun protection for eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Tightly woven, loose-fitting clothes provide additional protection from the Sun.
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FAQ

What is the warmest month in Winnetka?

August is the warmest month in Winnetka, California, with an average high-temperature of 85.6°F (29.8°C) and an average low-temperature of 64.8°F (18.2°C).

What is the temperature in August in Winnetka?

In August, in Winnetka, the average high-temperature is 85.6°F (29.8°C), and the average low-temperature is 64.8°F (18.2°C). In August, the average heat index (a.k.a. 'feels like', 'felt air temperature'), that represents influence of the relative humidity to air temperaure, is calculated to 88°F (31.1°C).

What is the average humidity in August in Winnetka?

In August, the average relative humidity in Winnetka, California, is 52%.

How many days does it rain in August in Winnetka?

In Winnetka, California, in August, it is raining for 1.5 days, with typically 0.08" (2mm) of accumulated precipitation.

When it does not snow in Winnetka?

In Winnetka snow does not fall in January through November.

How many hours of daylight does Winnetka have in August?

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

How many hours of sunshine does Winnetka have in August?

In Winnetka, California, the average sunshine in August is 12h.

What are the months with the highest UV index in Winnetka?

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

What is the UV index reading in August in Winnetka?

In August, the average daily maximum UV index is 6. A UV Index reading of 6 to 7 represents a high hazard to health from the exposure to the Sun's UV radiation.

Average temperature in August
Winnetka, CA

Average temperature in August - Winnetka, CA
  • Average high temperature in August: 85.6°F

The warmest month (with the highest average high temperature) is August (85.6°F).
The month with the lowest average high temperature is December (61.9°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 (46.9°F).

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Average pressure in August
Winnetka, CA

Average pressure in August - Winnetka, 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 (29.89").

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Average wind speed in August
Winnetka, CA

Average wind speed in August - Winnetka, CA
  • Average wind speed in August: 4.6mph

The windiest months (with the highest average wind speed) are January and December (6.1mph).
The calmest month (with the lowest average wind speed) is September (4.5mph).

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Average humidity in August
Winnetka, CA

Average humidity in August - Winnetka, CA
  • Average humidity in August: 52%

The month with the highest relative humidity is June (59%).
The month with the lowest relative humidity is November (47%).

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Average rainfall in August
Winnetka, CA

Average rainfall in August - Winnetka, CA
  • Average rainfall in August: 0.08"

The wettest month (with the highest rainfall) is February (1.22").
The driest month (with the least rainfall) is June (0.04").

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Average rainfall days in August
Winnetka, CA

Average rainfall days in August - Winnetka, CA
  • Average rainfall days in August: 1.5 days

The month with the highest number of rainy days is March (6.5 days).
The month with the least rainy days is June (1.4 days).

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Average snowfall days in August
Winnetka, CA

Average snowfall days in August - Winnetka, CA
  • Average snowfall days in August: 0 days

The month with the highest number of snowfall days is December (0.1 days).
Months with the least snowfall days are January, February, March, April, May, June, July, August, September, October and November (0 days).

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Average daylight in August /
Average sunshine in August
Winnetka, CA

Average daylight in August / Average sunshine in August - Winnetka, 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: 12h

Months with the most sunshine are June and July (Average sunshine: 12.1h).
Months with the least sunshine are January, February and December (Average sunshine: 6.8).

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Average sunshine days in August
Winnetka, CA

Average sunshine days in August - Winnetka, CA
  • Average sunshine days in August: 27.3 days

Months with the most sunshine days are August and October (27.3 days).
The month with the least sunshine days is February (22 days).

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Average UV index in August
Winnetka, CA

Average UV index in August - Winnetka, 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
Winnetka, CA

Average cloud cover in August - Winnetka, CA
  • Average cloud cover in August: 4

The month with the most cloud cover is March (Cloud cover 22).
The month with the least cloud cover is August (Cloud cover 4).

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Average visibility in August
Winnetka, CA

Average visibility in August - Winnetka, 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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