August weather forecast
Lake Forest, IL

Weather in August

August, the last month of the summer in Lake Forest, is another warm month, with an average temperature fluctuating between 66.7°F (19.3°C) and 77.5°F (25.3°C).

Temperature

In August, the average high-temperature is essentially the same as in July - a still moderately hot 77.5°F (25.3°C). In Lake Forest, in August, the average low-temperature is 66.7°F (19.3°C).

Humidity

In Lake Forest, the average relative humidity in August is 76%.

Rainfall

In Lake Forest, during August, the rain falls for 15.8 days and regularly aggregates up to 3.07" (78mm) of precipitation. Throughout the year, in Lake Forest, there are 154.1 rainfall days, and 30.24" (768mm) of precipitation is accumulated.

Snowfall

May through September are months without snowfall.

Daylight

In Lake Forest, Illinois, the average length of the day in August is 13h and 50min.
On the first day of the month, sunrise is at 5:44 am and sunset at 8:10 pm. On the last day of August, in Lake Forest, sunrise is at 6:15 am and sunset at 7:27 pm CDT.

Sunshine

With an average of 10.7h of sunshine, August has the most sunshine of the year.

UV index

The months with the highest UV index in Lake Forest are June through August, with an average maximum UV index of 6. A UV Index value of 6 to 7 symbolizes a high health risk from exposure to the Sun's UV rays for average individuals.
Note: In August, the average maximum UV index of 6 translate into the following recommendations:
Take precautions and utilize sun safety practices. Protection against skin and eye damage is required. 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 the 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 temperature in August in Lake Forest?

The average high-temperature, in August, is 77.5°F (25.3°C), while the average low-temperature is 66.7°F (19.3°C).

What is the average humidity in August in Lake Forest?

In Lake Forest, Illinois, the average relative humidity in August is 76%.

How much does it rain in Lake Forest in August?

In Lake Forest, Illinois, during August, the rain falls for 15.8 days and regularly aggregates up to 3.07" (78mm) of precipitation.

When it does not snow in Lake Forest?

In Lake Forest, snow does not fall in May through September.

How many hours of daylight does Lake Forest have in August?

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

When is the sunrise / sunset in August in Lake Forest?

On the first day of August in Lake Forest, sunrise is at 5:44 am and sunset at 8:10 pm. On the last day of the month, sunrise is at 6:15 am and sunset at 7:27 pm CDT.

What month has the most sunshine in Lake Forest?

August has the most sunshine of the year in Lake Forest, with an average of 10.7h of sunshine.

How many hours of sunshine does Lake Forest have in August?

In August, the average sunshine duration in Lake Forest is 10.7h.

When is the highest UV index in Lake Forest?

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

What is the UV index intensity in August in Lake Forest?

The average daily maximum UV index in August is 6. A UV Index estimate of 6 to 7 represents a high hazard to health from unprotected exposure to UV radiation.
Average humidity
Average rainfall days
Average snowfall
Average snowfall days
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in August
Lake Forest, IL

Average temperature in August - Lake Forest, IL
  • Average high temperature in August: 77.5°F

The warmest month (with the highest average high temperature) is July (77.7°F).
The month with the lowest average high temperature is January (28.6°F).

  • Average low temperature in August: 66.7°F

The months with the highest average low temperature are July and August (66.7°F).
The coldest month (with the lowest average low temperature) is January (18.9°F).

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Average pressure in August
Lake Forest, IL

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

The month with the highest atmospheric pressure is January (30.1"Hg).
The month with the lowest atmospheric pressure is June (29.92"Hg).

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Average wind speed in August
Lake Forest, IL

Average wind speed in August - Lake Forest, IL
  • Average wind speed in August: 7.4mph

The windiest month (with the highest average wind speed) is January (11.9mph).
The calmest month (with the lowest average wind speed) is August (7.4mph).

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Average humidity in August
Lake Forest, IL

Average humidity in August - Lake Forest, IL
  • Average humidity in August: 76%

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

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Average rainfall in August
Lake Forest, IL

Average rainfall in August - Lake Forest, IL
  • Average rainfall in August: 3.07"

The wettest months (with the highest rainfall) are May and June (3.82").
The driest month (with the least rainfall) is December (1.3").

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Average rainfall days in August
Lake Forest, IL

Average rainfall days in August - Lake Forest, IL
  • Average rainfall days in August: 15.8 days

The month with the highest number of rainy days is May (17.7 days).
The month with the least rainy days is February (5.9 days).

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Average snowfall in August
Lake Forest, IL

Average snowfall in August - Lake Forest, IL
  • Average snowfall in August: 0"

The month with the highest snowfall is January (4.13").
The months with the least snowfall are May, June, July, August and September (0").

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Average snowfall days in August
Lake Forest, IL

Average snowfall days in August - Lake Forest, IL
  • Average snowfall days in August: 0 days

The month with the highest number of snowfall days is January (11.9 days).
The months with the least snowfall days are May, June, July, August and September (0 days).

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Average daylight in August /
Average sunshine in August
Lake Forest, IL

Average daylight in August / Average sunshine in August - Lake Forest, IL
  • Average daylight in August: 13h and 50min

The month with the longest days is June (Average daylight: 15h and 13min).
The month with the shortest days is December (Average daylight: 9h and 9min).

  • Average sunshine in August: 10h and 42min

The month with the most sunshine is August (Average sunshine: 10h and 42min).
The month with the least sunshine is January (Average sunshine: 3h and 48min).

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Average sunshine days in August
Lake Forest, IL

Average sunshine days in August - Lake Forest, IL
  • Average sunshine days in August: 13.1 days

The month with the most sunshine days is December (15.3 days).
The month with the least sunshine days is April (10.8 days).

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Average UV index in August
Lake Forest, IL

Average UV index in August - Lake Forest, 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
Lake Forest, IL

Average cloud cover in August - Lake Forest, IL
  • Average cloud cover in August: 27

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 27).

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Average visibility in August
Lake Forest, IL

Average visibility in August - Lake Forest, 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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