May weather forecastLake Forest, IL
May
Weather in May
The last month of the spring, May, is a comfortable month in Lake Forest, Illinois, with an average temperature varying between 49.6°F (9.8°C) and 61.2°F (16.2°C).Temperature
May sees a rise in the average high-temperature, climbing from a cool 50.9°F (10.5°C) in April to a comfortable 61.2°F (16.2°C). Throughout May, Lake Forest witnesses a nighttime temperature average of 49.6°F (9.8°C).Humidity
The average relative humidity in May in Lake Forest is 79%.Rainfall
The months with the most rainfall are May and June, with an average 3.82" (97mm) of precipitation.Snowfall
May through September are months without snowfall in Lake Forest, Illinois.Daylight
In Lake Forest, the average length of the day in May is 14h and 37min.On the first day of the month, sunrise is at 5:45 am and sunset at 7:51 pm. On the last day of May, in Lake Forest, sunrise is at 5:17 am and sunset at 8:20 pm CDT.
Sunshine
The average sunshine in May is 8.9h.UV index
The average daily maximum UV index in May in Lake Forest is 4. A UV Index of 3 to 5 symbolizes a medium vulnerability from unprotected exposure to Sun's UV rays for the ordinary person.Note: An average maximum UV index of 4 in May leads to these recommendations:
Put precautions into practice - Ensuring skin and eye safety is a necessity. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. In the presence of strong sunlight, it's crucial to wear sunglasses that ward off UVA and UVB rays.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
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).
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).
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).
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%).
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").
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).
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").
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).
Average daylight in May /
Average sunshine in May
Lake Forest, IL
- Average daylight in May: 14h and 36min
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 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).
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).
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).
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).
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).
