Climate and monthly weather forecast
Winnetka, IL

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Weather in January

January, like December, is another subzero cold winter month in Winnetka, Illinois, with temperature in the range of an average low of 18.9°F (-7.3°C) and an average high of 28.8°F (-1.8°C). Winnetka reaches its lowest average temperatures in January, measuring 28.8°F (-1.8°C) at the peak and 18.9°F (-7.3°C) at the lowest. Weather in January »

Weather in February

February, the last month of the winter in Winnetka, is another freezing cold month, with an average temperature ranging between min 21.6°F (-5.8°C) and max 31.8°F (-0.1°C). Winnetka's weather in February, with an average high-temperature of a still subzero cold 31.8°F (-0.1°C), subtly shifts from January's 28.8°F (-1.8°C). Weather in February »

Weather in March

March, the first month of the spring in Winnetka, is a wintry month, with temperature in the range of an average high of 42.3°F (5.7°C) and an average low of 31.5°F (-0.3°C). In Winnetka, stepping into March brings a temperature increase, moving up from February's subzero cold 31.8°F (-0.1°C) to a wintry 42.3°F (5.7°C). Weather in March »

Weather in April

April is a cool spring month in Winnetka, Illinois, with an average temperature fluctuating between 39.7°F (4.3°C) and 52°F (11.1°C). Winnetka sees an increase in average high-temperatures during April, moving from an icy 42.3°F (5.7°C) in March to a cool 52°F (11.1°C). Weather in April »

Weather in May

The last month of the spring, May, is an enjoyable month in Winnetka, Illinois, with an average temperature fluctuating between 50.4°F (10.2°C) and 62.8°F (17.1°C). May's onset brings a temperature rise, moving from a cool 52°F (11.1°C) in April to a comfortable 62.8°F (17.1°C). Weather in May »

Weather in June

The first month of the summer, June, is a pleasant month in Winnetka, Illinois, with temperature in the range of an average low of 60.1°F (15.6°C) and an average high of 72.5°F (22.5°C). June's arrival signals an increase in average high-temperatures, moving from May's comfortable 62.8°F (17.1°C) to an agreeable 72.5°F (22.5°C). Weather in June »

Weather in July

July in Winnetka, Illinois, is a moderately hot summer month, with an average temperature fluctuating between 67.1°F (19.5°C) and 79.2°F (26.2°C). In Winnetka, the peak temperatures are generally noted in July, averaging a high of 79.2°F (26.2°C) and a low of 67.1°F (19.5°C). Weather in July »

Weather in August

August, the last month of the summer in Winnetka, is another warm month, with an average temperature varying between 78.1°F (25.6°C) and 66.9°F (19.4°C). The advent of August presents an average high-temperature of a still moderately hot 78.1°F (25.6°C), maintaining a close correlation with the preceding month. Weather in August »

Weather in September

The first month of the autumn, September, is still a pleasant month in Winnetka, Illinois, with an average temperature fluctuating between 71.6°F (22°C) and 60.3°F (15.7°C). September sees a slight reduction in average high-temperature, with a shift from a warm 78.1°F (25.6°C) in August to a pleasant 71.6°F (22°C). Weather in September »

Weather in October

October, like September, is another refreshing autumn month in Winnetka, Illinois, with an average temperature fluctuating between 59.5°F (15.3°C) and 47.7°F (8.7°C). As September shifts into October, a slight alteration in temperatures is observed, with average highs reducing from a pleasant 71.6°F (22°C) to a refreshing 59.5°F (15.3°C). Weather in October »

Weather in November

November, the last month of the autumn in Winnetka, is another chilly month, with an average temperature ranging between min 35.1°F (1.7°C) and max 45.5°F (7.5°C). The arrival of November signals a shift in temperature, down from a mild 59.5°F (15.3°C) in October to a chilly 45.5°F (7.5°C). Weather in November »

Weather in December

The first month of the winter, December, is still a cold month in Winnetka, Illinois, with an average temperature fluctuating between 34.9°F (1.6°C) and 26.1°F (-3.3°C). Winnetka's December weather shows a moderate shift in high-temperatures, falling from November's chilly 45.5°F (7.5°C) to a cold 34.9°F (1.6°C). Weather in December »
Updated: Jul 14, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What is the coldest time of year?

January stands out as Winnetka's coldest month, with temperatures ranging between an average high of 28.8°F (-1.8°C) and a low of 18.9°F (-7.3°C).

What is the most humid month?

January is the most humid month, with an average relative humidity of 82%.

How much does it rain in Winnetka?

Throughout the year, in Winnetka, Illinois, there are 164.7 rainfall days, and 35.28" (896mm) of precipitation is accumulated.

When does it snow?

January through May, October through December are months with snowfall.

What is the snowiest month?

The month with the most snowfall is January, when snow falls for 13.1 days and typically aggregates up to 4.84" (123mm) of snow.

How many days does it snow?

In Winnetka, during the entire year, snow falls for 47.6 days and aggregates up to 17.8" (452mm) of snow.

What is the month with the least sunshine?

The month with the least sunshine in Winnetka is January, with an average of 3.7h of sunshine.

When is Daylight Saving Time (DST)?

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.

What is the wettest month?

The months with the most rainfall are May and June, with an average 4.57" (116mm) of precipitation.

When it does not snow?

In Winnetka, snow does not fall in June through September.

When are the longest days?

The month with the longest days is June, with an average of 15h and 12min of daylight.

What are the months with the highest UV index?

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

What month is the hottest in Winnetka?

In Winnetka, the peak average temperatures are observed in July, with a high of 79.2°F (26.2°C) and a low of 67.1°F (19.5°C).

What is the month with the most sunshine?

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

What is the least humid month?

October is the least humid month, with an average relative humidity of 73%.

What is the driest month?

December is the month with the least rainfall. Rain falls for 9.1 days and accumulates 1.65" (42mm) of precipitation.

What is the month with the shortest days?

With an average of 9h and 12min of daylight, December has the shortest days of the year.

When is the lowest UV index?

The month with the lowest UV index is December, with an average maximum UV index of 1.

Average temperature
Winnetka, IL

Average temperature - Winnetka, IL

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).

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).

Average pressure
Winnetka, IL

Average pressure - Winnetka, IL

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

Average wind speed
Winnetka, IL

Average wind speed - Winnetka, IL

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).

Average humidity
Winnetka, IL

Average humidity - Winnetka, IL

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

Average rainfall
Winnetka, IL

Average rainfall - Winnetka, IL

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

Average rainfall days
Winnetka, IL

Average rainfall days - Winnetka, IL

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).

Average snowfall
Winnetka, IL

Average snowfall - Winnetka, IL

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

Average snowfall days
Winnetka, IL

Average snowfall days - Winnetka, IL

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).

Average daylight / Average sunshine
Winnetka, IL

Average daylight / Average sunshine - Winnetka, 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 24min).
The month with the least sunshine is January (Average sunshine: 3h and 42min).

Average sunshine days
Winnetka, IL

Average sunshine days - Winnetka, IL

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

Average visibility
Winnetka, IL

Average visibility - Winnetka, IL

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).

Winnetka, Illinois, USA

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