Climate and monthly weather forecast
Westmont, IL

Weather in January

January, like December, is a freezing cold winter month in Westmont, Illinois, with temperature in the range of an average high of 28.8°F (-1.8°C) and an average low of 17.1°F (-8.3°C). With an average high-temperature of 28.8°F (-1.8°C) and an average low-temperature of 17.1°F (-8.3°C), January is the coldest month. Weather in January »

Weather in February

February, the last month of the winter in Westmont, is a wintry month, with an average temperature fluctuating between 32.5°F (0.3°C) and 19.9°F (-6.7°C). In Westmont, the average high-temperature in February is practically the same as in January - a cold 32.5°F (0.3°C). Weather in February »

Weather in March

March, the first month of the spring in Westmont, is a chilly month, with an average temperature varying between 45.1°F (7.3°C) and 31.5°F (-0.3°C). In March, the average high-temperature rises from a cold 32.5°F (0.3°C) in February to a chilly 45.1°F (7.3°C). Weather in March »

Weather in April

April in Westmont, Illinois, is a moderate spring month, with an average temperature ranging between min 40.6°F (4.8°C) and max 56.5°F (13.6°C). In April, the average high-temperature increases from a frosty 45.1°F (7.3°C) in March to a moderate 56.5°F (13.6°C). Weather in April »

Weather in May

May, the last month of the spring in Westmont, is a pleasant month, with an average temperature varying between 52.2°F (11.2°C) and 68.9°F (20.5°C). In Westmont, the average high-temperature in May increases from a moderate 56.5°F (13.6°C) in April to an agreeable 68.9°F (20.5°C). Weather in May »

Weather in June

The first month of the summer, June, is a moderately hot month in Westmont, Illinois, with an average temperature ranging between min 61.7°F (16.5°C) and max 78.3°F (25.7°C). In June, the average high-temperature rises from a pleasant 68.9°F (20.5°C) in May to a moderately hot 78.3°F (25.7°C). Weather in June »

Weather in July

July, like June, in Westmont, Illinois, is another warm summer month, with an average temperature ranging between min 66.4°F (19.1°C) and max 82.4°F (28°C). July is the warmest month, with an average high-temperature of 82.4°F (28°C) and an average low-temperature of 66.4°F (19.1°C). The average heat index in July is evaluated at a tropical 89.6°F (32°C). Weather in July »

Weather in August

August, the last month of the summer in Westmont, is another warm month, with temperature in the range of an average high of 81.1°F (27.3°C) and an average low of 64.8°F (18.2°C). In August, the average high-temperature is almost the same as in July - a still moderately hot 81.1°F (27.3°C). Weather in August »

Weather in September

The first month of the autumn, September, is still a warm month in Westmont, Illinois, with an average temperature ranging between min 57.9°F (14.4°C) and max 74.3°F (23.5°C). In Westmont, the average high-temperature in September slightly decreases from 81.1°F (27.3°C) in August to a still moderately hot 74.3°F (23.5°C). Weather in September »

Weather in October

October, the same as September, in Westmont, Illinois, is another mild autumn month, with an average temperature varying between 60.6°F (15.9°C) and 45.7°F (7.6°C). In Westmont, Illinois, the average high-temperature in October drops from a moderately hot 74.3°F (23.5°C) in September to a moderate 60.6°F (15.9°C). Weather in October »

Weather in November

The last month of the autumn, November, is another chilly month in Westmont, Illinois, with temperature in the range of an average high of 45.7°F (7.6°C) and an average low of 33.6°F (0.9°C). In November, the average high-temperature significantly decreases from a moderate 60.6°F (15.9°C) in October to a chilly 45.7°F (7.6°C). Weather in November »

Weather in December

The first month of the winter, December, is still a cold month in Westmont, Illinois, with an average temperature varying between 34.5°F (1.4°C) and 25°F (-3.9°C). In Westmont, the average high-temperature in December drops from a frosty 45.7°F (7.6°C) in November to a wintry 34.5°F (1.4°C). Weather in December »
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FAQ

What is the coldest month in Westmont?

January is the coldest month, with an average high-temperature of 28.8°F (-1.8°C) and an average low-temperature of 17.1°F (-8.3°C).

What is the most humid month in Westmont?

The months with the highest humidity are January and February, with an average relative humidity of 82%.

How many days does it rain in Westmont?

In Westmont, Illinois, during the entire year, the rain falls for 118.5 days and collects up to 13.74" (349mm) of precipitation.

When does it snow in Westmont?

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

How many days does it snow in Westmont?

In Westmont, during the entire year, snow falls for 34.9 days and aggregates up to 7.2" (183mm) of snow.

What is the month with the least sunshine in Westmont?

January has the least sunshine of the year in Westmont, Illinois, with an average of 3.7h of sunshine.

What is the month with the lowest UV index in Westmont?

With an average maximum UV index of 1, January is the month with the lowest UV index in Westmont.

When does it snow the most in Westmont?

The month with the most snowfall in Westmont is February, when snow falls for 8.6 days and typically aggregates up to 2.28" (58mm) of snow.

When is Daylight Saving Time (DST) in Westmont?

On Sunday, March 12. 2023, at 2:00 am, Daylight Saving Time starts, and the time zone changes from CST to CDT. Daylight Saving Time ends Sunday, November 5. 2023, at 2:00 am, and the time zone reverts from CDT to CST.

What is the wettest month in Westmont?

May is the month with the most rainfall in Westmont, Illinois. Rain falls for 14.9 days and accumulates 1.97" (50mm) of precipitation.

When it does not snow in Westmont?

May through September are months without snowfall in Westmont, Illinois.

When are the longest days in Westmont?

The month with the longest days in Westmont, Illinois, is June, with an average of 15h and 10min of daylight.

When is the highest UV index in Westmont?

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

What is the warmest month in Westmont?

July is the warmest month in Westmont, with an average high-temperature of 82.4°F (28°C) and an average low-temperature of 66.4°F (19.1°C).

What month has the most sunshine in Westmont?

August has the most sunshine of the year, with an average of 10h of sunshine.

What is the least humid month in Westmont?

The least humid month in Westmont is October, with an average relative humidity of 72%.

What is the driest month in Westmont?

December is the month with the least rainfall in Westmont. Rain falls for 4.9 days and accumulates 0.63" (16mm) of precipitation.

What is the month with the shortest days in Westmont?

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

Average temperature
Westmont, IL

Average temperature - Westmont, IL

The warmest month (with the highest average high temperature) is July (82.4°F).
The month with the lowest average high temperature is January (28.8°F).

The month with the highest average low temperature is July (66.4°F).
The coldest month (with the lowest average low temperature) is January (17.1°F).

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Average pressure
Westmont, IL

Average pressure - Westmont, 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).

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Average wind speed
Westmont, IL

Average wind speed - Westmont, IL

The windiest month (with the highest average wind speed) is January (9.7mph).
The calmest month (with the lowest average wind speed) is August (6.1mph).

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Average humidity
Westmont, IL

Average humidity - Westmont, IL

The months with the highest relative humidity are January and February (82%).
The month with the lowest relative humidity is October (72%).

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Average rainfall
Westmont, IL

Average rainfall - Westmont, IL

The wettest month (with the highest rainfall) is May (1.97").
The driest month (with the least rainfall) is December (0.63").

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Average rainfall days
Westmont, IL

Average rainfall days - Westmont, IL

The month with the highest number of rainy days is May (14.9 days).
The month with the least rainy days is February (4.2 days).

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Average snowfall
Westmont, IL

Average snowfall - Westmont, IL

The month with the highest snowfall is February (2.28").
The months with the least snowfall are May, June, July, August and September (0").

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Average snowfall days
Westmont, IL

Average snowfall days - Westmont, IL

The month with the highest number of snowfall days is January (9.7 days).
The months with the least snowfall days are June, July, August and September (0 days).

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Average daylight / Average sunshine
Westmont, IL

Average daylight / Average sunshine - Westmont, IL

The month with the longest days is June (Average daylight: 15h and 10min).
The month with the shortest days is December (Average daylight: 9h and 12min).

The month with the most sunshine is August (Average sunshine: 10h and 0min).
The month with the least sunshine is January (Average sunshine: 3h and 42min).

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Average sunshine days
Westmont, IL

Average sunshine days - Westmont, IL

The month with the most sunshine days is December (20.7 days).
The month with the least sunshine days is July (11.8 days).

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Average visibility
Westmont, IL

Average visibility - Westmont, 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).

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