August weather forecast
Winnetka, IL

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Weather in August

August, the last month of the summer in Winnetka, is another warm month, with an average temperature varying between 66.9°F (19.4°C) and 78.1°F (25.6°C).

Temperature

August's average high-temperature stands at a still moderately hot 78.1°F (25.6°C), showing little deviation from July's 79.2°F (26.2°C). Throughout the month of August, Winnetka sees a steady low-temperature average of 66.9°F (19.4°C).

Humidity

The average relative humidity in August is 75%.

Rainfall

In Winnetka, in August, during 17.7 rainfall days, 3.7" (94mm) of precipitation is typically accumulated. In Winnetka, during the entire year, the rain falls for 164.7 days and collects up to 35.28" (896mm) of precipitation.

Snowfall

June through September are months without snowfall.

Daylight

In Winnetka, Illinois, the average length of the day in August is 13h and 50min.
On the first day of August, sunrise is at 5:44 am and sunset at 8:09 pm. On the last day of the month, sunrise is at 6:16 am and sunset at 7:25 pm CDT.

Sunshine

July and August, with an average of 10.4h of sunshine, are months with the most sunshine.

UV index

June through August, with an average maximum UV index of 6, are months with the highest UV index in Winnetka. A UV Index of 6 to 7 symbolizes a high threat to health from unprotected exposure to Sun's UV rays for average individuals.
Note: In August, a daily maximum UV index of 6 leads to the following instructions:
Stand by precautions and apply sun safety measures. Evading sunburn is of great importance. Avoid direct Sun exposure and stay in the shade between 10 a.m. and 4 p.m., a time when UV radiation is most intense, noting that not all shade structures offer full protection. For effective sun eye protection, rely on sunglasses certified for UVA and UVB resistance.
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Frequently asked questions

What is the temperature in August in Winnetka?

August temperatures in Winnetka, Illinois, vary between a high-temperature of 78.1°F (25.6°C) and a low-temperature of 66.9°F (19.4°C).

What is the average humidity in August in Winnetka?

The average relative humidity in August is 75%.

How many days does it rain in August in Winnetka?

In Winnetka, Illinois, in August, it is raining for 17.7 days, with typically 3.7" (94mm) of accumulated precipitation.

When it does not snow in Winnetka?

June through September are months without snowfall.

How many hours of daylight does Winnetka have in August?

In August, the average day length is 13h and 50min.

When is the sunrise / sunset in August in Winnetka?

In August, on the first day of the month, sunrise is at 5:44 am and sunset at 8:09 pm. On the last day of the month, in Winnetka, sunrise is at 6:16 am and sunset at 7:25 pm CDT.

What is the month with the most sunshine in Winnetka?

The months with the most sunshine in Winnetka are July and August, with an average of 10.4h of sunshine.

How long on average sun shines in August in Winnetka?

In August, the average sunshine duration is 10.4h.

What is the month with the highest UV index in Winnetka?

The months with the highest UV index are June through August, with an average maximum UV index of 6.

How high is the UV index in August in Winnetka?

In August, the average daily maximum UV index is 6. A UV Index value of 6 to 7 symbolizes a high hazard to health from unprotected exposure to UV radiation.
Average humidity
Average rainfall days
Average snowfall
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in August
Winnetka, IL

Average temperature in August - Winnetka, IL
  • Average high temperature in August: 78.1°F

The warmest month (with the highest average high temperature) is July (79.2°F).
The month with the lowest average high temperature is January (28.8°F).

  • Average low temperature in August: 66.9°F

The month with the highest average low temperature is July (67.1°F).
The coldest month (with the lowest average low temperature) is January (18.9°F).

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Average pressure in August
Winnetka, IL

Average pressure in August - Winnetka, IL
  • Average pressure in August: 29.98"Hg

The month with the highest atmospheric pressure is January (30.11"Hg).
The month with the lowest atmospheric pressure is June (29.92"Hg).

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Average wind speed in August
Winnetka, IL

Average wind speed in August - Winnetka, IL
  • Average wind speed in August: 7.1mph

The windiest month (with the highest average wind speed) is January (11.5mph).
The calmest month (with the lowest average wind speed) is August (7.1mph).

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Average humidity in August
Winnetka, IL

Average humidity in August - Winnetka, IL
  • Average humidity in August: 75%

The month with the highest relative humidity is January (82%).
The month with the lowest relative humidity is October (73%).

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Average rainfall in August
Winnetka, IL

Average rainfall in August - Winnetka, IL
  • Average rainfall in August: 3.7"

The wettest months (with the highest rainfall) are May and June (4.57").
The driest month (with the least rainfall) is December (1.65").

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Average rainfall days in August
Winnetka, IL

Average rainfall days in August - Winnetka, IL
  • Average rainfall days in August: 17.7 days

The month with the highest number of rainy days is May (19.1 days).
The month with the least rainy days is February (6.1 days).

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Average snowfall in August
Winnetka, IL

Average snowfall in August - Winnetka, IL
  • Average snowfall in August: 0"

The month with the highest snowfall is January (4.84").
The months with the least snowfall are June, July, August and September (0").

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Average snowfall days in August
Winnetka, IL

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

The month with the highest number of snowfall days is January (13.1 days).
The months with the least snowfall days are June, July, August and September (0 days).

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

Average daylight in August / Average sunshine in August - Winnetka, IL
  • Average daylight in August: 13h and 5min

The month with the longest days is June (Average daylight: 15h and 12min).
The month with the shortest days is December (Average daylight: 9h and 12min).

  • Average sunshine in August: 10h and 2min

The months with the most sunshine are July and August (Average sunshine: 10h and 24min).
The month with the least sunshine is January (Average sunshine: 3h and 42min).

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Average sunshine days in August
Winnetka, IL

Average sunshine days in August - Winnetka, IL
  • Average sunshine days in August: 10.5 days

The month with the most sunshine days is November (15.5 days).
The month with the least sunshine days is June (9.2 days).

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Average UV index in August
Winnetka, IL

Average UV index in August - Winnetka, IL
  • Average UV index in August: 6

The months with the highest UV index are June, July and August (UV index 6).
The month with the lowest UV index is December (UV index 1).

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Average cloud cover in August
Winnetka, IL

Average cloud cover in August - Winnetka, IL
  • Average cloud cover in August: 28

The month with the most cloud cover is January (Cloud cover 61).
The months with the least cloud cover are July and August (Cloud cover 28).

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Average visibility in August
Winnetka, IL

Average visibility in August - Winnetka, IL
  • 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).

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Winnetka, Illinois, USA

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