Climate and monthly weather forecast
Wilmette, IL

Climate and monthly weather forecast

Weather in January

January, the same as December, in Wilmette, Illinois, is a freezing cold winter month, with an average temperature ranging between min -6.4°C and max -1.6°C. January is the coldest month, exhibiting average temperatures of -1.6°C at the peak and -6.4°C at the base. Weather in January »

Weather in February

The last month of the winter, February, is another freezing cold month in Wilmette, Illinois, with temperature in the range of an average high of -0.1°C and an average low of -5.1°C. February registers an average high-temperature of a still subzero cold -0.1°C, slightly varied from January's -1.6°C. Weather in February »

Weather in March

March, the first month of the spring in Wilmette, is a cold month, with temperature in the range of an average low of 0°C and an average high of 4.9°C. The shift from February to March sees an increase in the average high-temperature, transitioning from a freezing cold -0.1°C to a cold 4.9°C. Weather in March »

Weather in April

April in Wilmette, Illinois, is a chilly spring month, with an average temperature fluctuating between 4.3°C and 9.9°C. Wilmette's weather in April presents a rise in the average high-temperature, moving from a cold 4.9°C in March to a frosty 9.9°C. Weather in April »

Weather in May

May, the last month of the spring in Wilmette, is a mild month, with an average temperature fluctuating between 15.4°C and 9.8°C. The shift from April to May brings an increase in the average high-temperature, moving from a chilly 9.9°C to a moderate 15.4°C. Weather in May »

Weather in June

The first month of the summer, June, is a pleasant month in Wilmette, Illinois, with an average temperature varying between 20.9°C and 15.5°C. Wilmette in June sees a temperature change, with average high-temperatures moving from a refreshing 15.4°C in May to a pleasant 20.9°C. Weather in June »

Weather in July

July in Wilmette, Illinois, is a warm summer month, with an average temperature varying between 24.9°C and 20°C. July's onset brings a subtle temperature rise, moving from a pleasant 20.9°C in June to a moderately hot 24.9°C. Weather in July »

Weather in August

August, the last month of the summer in Wilmette, is another warm month, with temperature in the range of an average low of 20°C and an average high of 25°C. August temperatures tend to peak at an average high of 25°C and dip to a low of 20°C. Weather in August »

Weather in September

September, the first month of the autumn in Wilmette, is also an agreeable month, with an average temperature fluctuating between 21.5°C and 16.5°C. A modest decline in the average high-temperature is seen during September, decreasing from a moderately hot 25°C in August to an agreeable 21.5°C. Weather in September »

Weather in October

October, like September, is another mild autumn month in Wilmette, Illinois, with temperature in the range of an average low of 9.5°C and an average high of 14.8°C. As Wilmette enters October, the average high-temperature decreases from the an agreeable 21.5°C of September to a refreshing 14.8°C. Weather in October »

Weather in November

The last month of the autumn, November, is another chilly month in Wilmette, Illinois, with an average temperature fluctuating between 7.7°C and 2.6°C. November brings a decrease in the average high-temperature, shifting from a refreshing 14.8°C in October to a chilly 7.7°C. Weather in November »

Weather in December

December, the first month of the winter in Wilmette, is also a wintry month, with an average temperature varying between 1.9°C and -2.5°C. In December, the meteorological conditions alter, with the average high-temperature shifting from a frosty 7.7°C in November to a wintry 1.9°C. Weather in December »
Updated: Feb 12, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What is the coldest month in Wilmette?
January is the coldest month of the year in Wilmette, registering average temperatures as high as -1.6°C and as low as -6.4°C.
What is the most humid month in Wilmette?
With an average relative humidity of 82%, January is the most humid month.
How much does it rain in Wilmette?
In Wilmette, Illinois, during the entire year, the rain falls for 154.1 days and collects up to 846mm of precipitation.
When does it snow in Wilmette?
Months with snowfall are January through April, October through December.
What is the snowiest month in Wilmette?
January is the month with the most snowfall in Wilmette, Illinois. Snow falls for 11.6 days and accumulates 91mm of snow.
How much does it snow in Wilmette?
In Wilmette, Illinois, during the entire year, snow falls for 40.5 days and aggregates up to 324mm of snow.
What is the month with the least sunshine in Wilmette?
With an average of 3.6h of sunshine, January has the least sunshine of the year.
When is Daylight Saving Time (DST) in Wilmette?
On Sunday, March 10. 2024, at 2:00 am, Daylight Saving Time starts, and the time zone changes from CST to CDT. Daylight Saving Time ends Sunday, November 3. 2024, at 2:00 am, and the time zone reverts from CDT to CST.
When it does not snow in Wilmette?
May through September are months without snowfall in Wilmette, Illinois.
What is the wettest month in Wilmette?
The month with the most rainfall in Wilmette is June, when the rain falls for 16.7 days and typically aggregates up to 114mm of precipitation.
When are the longest days in Wilmette?
June has the longest days of the year in Wilmette, with an average of 15h and 12min of daylight.
What are the months with the highest UV index in Wilmette?
June through August, with an average maximum UV index of 6, are months with the highest UV index.
What is the month with the most sunshine in Wilmette?
The months with the most sunshine are July and August, with an average of 10.6h of sunshine.
What month is the hottest in Wilmette?
August is the warmest month of the year in Wilmette, Illinois, registering average temperatures as high as 25°C and as low as 20°C.
What is the least humid month in Wilmette?
The least humid month in Wilmette is October, with an average relative humidity of 73%.
What is the driest month in Wilmette?
The month with the least rainfall is December, when the rain falls for 7.9 days and typically collects 35mm of precipitation.
What is the month with the shortest days in Wilmette?
With an average of 9h and 12min of daylight, December has the shortest days of the year.
When is the lowest UV index in Wilmette?
December is the month with the lowest UV index, with an average maximum UV index of 1.
Average temperature - Wilmette, IL
Average temperature
Wilmette, IL

The warmest month (with the highest average high temperature) is August (25°C).
The month with the lowest average high temperature is January (-1.6°C).

The months with the highest average low temperature are July and August (20°C).
The coldest month (with the lowest average low temperature) is January (-6.4°C).

Average pressure - Wilmette, IL
Average pressure
Wilmette, IL

The month with the highest atmospheric pressure is January (1019.4mbar).
The month with the lowest atmospheric pressure is June (1013.3mbar).

Average wind speed - Wilmette, IL
Average wind speed
Wilmette, IL

The windiest month (with the highest average wind speed) is January (20.4km/h).
The calmest month (with the lowest average wind speed) is July (12.8km/h).

Average humidity - Wilmette, IL
Average humidity
Wilmette, IL

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

Average rainfall - Wilmette, IL
Average rainfall
Wilmette, IL

The wettest month (with the highest rainfall) is June (114mm).
The driest month (with the least rainfall) is December (35mm).

Average rainfall days - Wilmette, IL
Average rainfall days
Wilmette, IL

The month with the highest number of rainy days is July (17.3 days).
The month with the least rainy days is February (5.6 days).

Average snowfall - Wilmette, IL
Average snowfall
Wilmette, IL

The month with the highest snowfall is January (91mm).
The months with the least snowfall are May, June, July, August and September (0mm).

Average snowfall days - Wilmette, IL
Average snowfall days
Wilmette, IL

The month with the highest number of snowfall days is January (11.6 days).
The months with the least snowfall days are May, June, July, August and September (0 days).

Average daylight / Average sunshine - Wilmette, IL
Average daylight / Average sunshine
Wilmette, IL

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).

The months with the most sunshine are July and August (Average sunshine: 10h and 36min).
The month with the least sunshine is January (Average sunshine: 3h and 36min).

Average sunshine days - Wilmette, IL
Average sunshine days
Wilmette, IL

The month with the most sunshine days is December (15.3 days).
The months with the least sunshine days are June and July (10.9 days).

Average visibility - Wilmette, IL
Average visibility
Wilmette, IL

The months with the highest visibility are July, August, September and October (10km).
The months with the lowest visibility are January, February, March, April, May, June, November and December (9km).

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