May weather forecast
Lake Forest, IL

Weather in May

May, the last month of the spring in Lake Forest, is an enjoyable month, with an average temperature varying between 61.2°F (16.2°C) and 49.6°F (9.8°C).

Temperature

In May, the average high-temperature increases from a cool 50.9°F (10.5°C) in April to an enjoyable 61.2°F (16.2°C). In May, the average low-temperature is 49.6°F (9.8°C).

Humidity

In Lake Forest, Illinois, the average relative humidity in May is 79%.

Rainfall

The wettest months are May and June, with an average 3.82" (97mm) of rainfall.

Snowfall

May through September are months without snowfall.

Daylight

In May, the average length of the day is 14h and 37min.
On the first day of the month, sunrise is at 5:46 am and sunset at 7:50 pm. On the last day of May, in Lake Forest, sunrise is at 5:17 am and sunset at 8:20 pm CDT.

Sunshine

In May, the average sunshine is 8.9h.

UV index

In May, the average daily maximum UV index in Lake Forest is 4. A UV Index estimate of 3 to 5 represents a medium health hazard from unprotected exposure to Sun's UV rays for the average person.
Note: The daily maximum UV index of 4 in May interpret into the following advice:
Take precautions - Protection against skin and eye damage is obliged. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. 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 average humidity in May in Lake Forest?

In May, the average relative humidity in Lake Forest is 79%.

What is the rainiest month in Lake Forest?

The months with the most rainfall in Lake Forest are May and June, with an average 3.82" (97mm) of precipitation.

How much does it rain in Lake Forest in May?

In Lake Forest, Illinois, during May, the rain falls for 17.7 days and regularly aggregates up to 3.82" (97mm) of precipitation.

When it does not snow in Lake Forest?

May through September are months without snowfall.

Does it snow in Lake Forest in May?

In May, in Lake Forest, it doesn't snow. April is the latest month when it typically snows.

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

In May, the average day length in Lake Forest, Illinois, is 14h and 37min.

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

In May, on the first day of the month, sunrise is at 5:46 am and sunset at 7:50 pm. On the last day of the month, in Lake Forest, Illinois, sunrise is at 5:17 am and sunset at 8:20 pm CDT.

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

The average sunshine duration in May in Lake Forest is 8.9h.

What is the UV index reading in May in Lake Forest?

In May, the average daily maximum UV index in Lake Forest, Illinois, is 4. A UV Index reading of 3 to 5 represents a medium hazard to health from exposure to the Sun's UV radiation.
Average humidity
Average rainfall days
Average snowfall
Average snowfall days
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in May
Lake Forest, IL

Average temperature in May - Lake Forest, IL
  • Average high temperature in May: 61.2°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 May: 49.6°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 May
Lake Forest, IL

Average pressure in May - Lake Forest, IL
  • Average pressure in May: 29.96"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 May
Lake Forest, IL

Average wind speed in May - Lake Forest, IL
  • Average wind speed in May: 9.1mph

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 May
Lake Forest, IL

Average humidity in May - Lake Forest, IL
  • Average humidity in May: 79%

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 May
Lake Forest, IL

Average rainfall in May - Lake Forest, IL
  • Average rainfall in May: 3.82"

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 May
Lake Forest, IL

Average rainfall days in May - Lake Forest, IL
  • Average rainfall days in May: 17.7 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 May
Lake Forest, IL

Average snowfall in May - Lake Forest, IL
  • Average snowfall in May: 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 May
Lake Forest, IL

Average snowfall days in May - Lake Forest, IL
  • Average snowfall days in May: 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 May /
Average sunshine in May
Lake Forest, IL

Average daylight in May / Average sunshine in May - Lake Forest, IL
  • Average daylight in May: 14h and 37min

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 May: 8h and 54min

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 May
Lake Forest, IL

Average sunshine days in May - Lake Forest, IL
  • Average sunshine days in May: 11.2 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 May
Lake Forest, IL

Average UV index in May - Lake Forest, IL
  • Average UV index in May: 4

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 May
Lake Forest, IL

Average cloud cover in May - Lake Forest, IL
  • Average cloud cover in May: 41

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 May
Lake Forest, IL

Average visibility in May - Lake Forest, IL
  • Average visibility in May: 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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