Climate and monthly weather forecast
Oak Forest, IL

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Weather in January

January, like December, is a freezing cold winter month in Oak Forest, Illinois, with an average temperature ranging between max 29.7°F (-1.3°C) and min 18.7°F (-7.4°C). January is Oak Forest's coldest month, registering average high temperatures of 29.7°F (-1.3°C) and lows of 18.7°F (-7.4°C). Weather in January »

Weather in February

February, the last month of the winter in Oak Forest, is a wintry month, with an average temperature fluctuating between 21°F (-6.1°C) and 33.1°F (0.6°C). Oak Forest's weather in February indicates an average high-temperature of an icy 33.1°F (0.6°C), nearly consistent with the 29.7°F (-1.3°C) of January. Weather in February »

Weather in March

March, the first month of the spring in Oak Forest, is a chilly month, with an average temperature ranging between max 45.9°F (7.7°C) and min 32.4°F (0.2°C). The arrival of March brings an increase in high-temperatures, moving from a cold 33.1°F (0.6°C) in February to a frosty 45.9°F (7.7°C). Weather in March »

Weather in April

April is a refreshing spring month in Oak Forest, Illinois, with temperature in the range of an average low of 41.7°F (5.4°C) and an average high of 57°F (13.9°C). The transition from March to April brings a temperature rise, with average high-temperatures increasing from a frosty 45.9°F (7.7°C) to a mild 57°F (13.9°C). Weather in April »

Weather in May

The last month of the spring, May, is a pleasant month in Oak Forest, Illinois, with temperature in the range of an average high of 68.7°F (20.4°C) and an average low of 52.5°F (11.4°C). The transition from April to May brings a temperature rise, with average high-temperatures increasing from a moderate 57°F (13.9°C) to a pleasant 68.7°F (20.4°C). Weather in May »

Weather in June

June, the first month of the summer in Oak Forest, is a moderately hot month, with temperature in the range of an average high of 78.3°F (25.7°C) and an average low of 61.5°F (16.4°C). Oak Forest's weather in June presents a rise in the average high-temperature, moving from a pleasant 68.7°F (20.4°C) in May to a warm 78.3°F (25.7°C). Weather in June »

Weather in July

July, like June, in Oak Forest, Illinois, is another warm summer month, with temperature in the range of an average low of 65.8°F (18.8°C) and an average high of 81.9°F (27.7°C). In Oak Forest, temperatures reach their average annual highs in July, measuring 81.9°F (27.7°C) and a minimum average of 65.8°F (18.8°C). For July, the heat index is estimated at a tropical 87.8°F (31°C). Weather in July »

Weather in August

The last month of the summer, August, is also a moderately hot month in Oak Forest, Illinois, with an average temperature varying between 64.2°F (17.9°C) and 79.9°F (26.6°C). The unfolding of August shows an average high-temperature of a still moderately hot 79.9°F (26.6°C), indicating a slight variance from July's 81.9°F (27.7°C). Weather in August »

Weather in September

The first month of the autumn, September, is still a warm month in Oak Forest, Illinois, with temperature in the range of an average low of 57.9°F (14.4°C) and an average high of 73.9°F (23.3°C). September is characterized by a slight reduction in average high-temperature, easing from a moderately hot 79.9°F (26.6°C) in August to a still warm 73.9°F (23.3°C). Weather in September »

Weather in October

October, like September, in Oak Forest, Illinois, is another comfortable autumn month, with an average temperature varying between 61.2°F (16.2°C) and 46.8°F (8.2°C). The onset of October entails a temperature shift, as the average high-temperature decreases from a warm 73.9°F (23.3°C) in September to an enjoyable 61.2°F (16.2°C). Weather in October »

Weather in November

The last month of the autumn, November, is another chilly month in Oak Forest, Illinois, with an average temperature varying between 46.9°F (8.3°C) and 34.5°F (1.4°C). The commencement of November involves a temperature shift, with the average high-temperature dropping from an enjoyable 61.2°F (16.2°C) in October to a frosty 46.9°F (8.3°C). Weather in November »

Weather in December

The first month of the winter, December, is also an icy month in Oak Forest, Illinois, with an average temperature varying between 25.7°F (-3.5°C) and 35.4°F (1.9°C). As November transitions to December, the average high-temperature falls from a chilly 46.9°F (8.3°C) to a wintry 35.4°F (1.9°C). Weather in December »
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Frequently asked questions

What is the coldest time of year in Oak Forest?

January is the coldest month in Oak Forest, with the temperature often reaching an average high of 29.7°F (-1.3°C) and an average low of 18.7°F (-7.4°C).

What is the driest month in Oak Forest?

The months with the least rainfall in Oak Forest are January, February and December Rain falls for 4.5 days and accumulates 0.55" (14mm) of rain.

How much does it rain in Oak Forest?

In Oak Forest, Illinois, during the entire year, the rain falls for 111.8 days and collects up to 11.18" (284mm) of precipitation.

When does it snow in Oak Forest?

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

When does it snow the most in Oak Forest?

January is the month with the most snowfall in Oak Forest, Illinois. Snow falls for 10.3 days and accumulates 1.3" (33mm) of snow.

How much does it snow in Oak Forest?

In Oak Forest, during the entire year, snow falls for 34.2 days and aggregates up to 4.8" (122mm) of snow.

What is the month with the least sunshine in Oak Forest?

With an average of 3.7h of sunshine, January has the least sunshine of the year in Oak Forest, Illinois.

What are the months with the lowest UV index in Oak Forest?

The months with the lowest UV index in Oak Forest are January and December, with an average maximum UV index of 1.

What is the most humid month in Oak Forest?

The most humid month in Oak Forest, Illinois, is February, with an average relative humidity of 83%.

When is Daylight Saving Time (DST) in Oak Forest?

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 in Oak Forest?

The month with the most rainfall is May, when the rain falls for 12.4 days and typically aggregates up to 1.54" (39mm) of precipitation.

When it does not snow in Oak Forest?

In Oak Forest, Illinois, snow does not fall in May through September.

When are the longest days in Oak Forest?

With an average of 15h and 6min of daylight, June has the longest days of the year in Oak Forest, Illinois.

What are the months with the highest UV index in Oak Forest?

June and July, with an average maximum UV index of 6, are months with the highest UV index in Oak Forest.

What part of the year is the hottest in Oak Forest?

July brings the highest temperatures in Oak Forest, Illinois, with an average high of 81.9°F (27.7°C) and an average low of 65.8°F (18.8°C).

What month has the most sunshine in Oak Forest?

The month with the most sunshine is August, with an average of 10h of sunshine.

What is the least humid month in Oak Forest?

The least humid month in Oak Forest is October, with an average relative humidity of 73%.

What is the month with the shortest days in Oak Forest?

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

Average temperature
Oak Forest, IL

Average temperature - Oak Forest, IL

The warmest month (with the highest average high temperature) is July (81.9°F).
The month with the lowest average high temperature is January (29.7°F).

The month with the highest average low temperature is July (65.8°F).
The coldest month (with the lowest average low temperature) is January (18.7°F).

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Average pressure
Oak Forest, IL

Average pressure - Oak Forest, 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
Oak Forest, IL

Average wind speed - Oak Forest, IL

The windiest month (with the highest average wind speed) is January (10.1mph).
The calmest month (with the lowest average wind speed) is August (6.2mph).

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Average humidity
Oak Forest, IL

Average humidity - Oak Forest, IL

The month with the highest relative humidity is February (83%).
The month with the lowest relative humidity is October (73%).

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Average rainfall
Oak Forest, IL

Average rainfall - Oak Forest, IL

The wettest month (with the highest rainfall) is May (1.54").
The driest months (with the least rainfall) are January, February and December (0.55").

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Average rainfall days
Oak Forest, IL

Average rainfall days - Oak Forest, IL

The month with the highest number of rainy days is July (14.1 days).
The month with the least rainy days is February (4.1 days).

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Average snowfall
Oak Forest, IL

Average snowfall - Oak Forest, IL

The month with the highest snowfall is January (1.3").
The months with the least snowfall are May, June, July, August and September (0").

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Average snowfall days
Oak Forest, IL

Average snowfall days - Oak Forest, IL

The month with the highest number of snowfall days is January (10.3 days).
The months with the least snowfall days are May, June, July, August and September (0 days).

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Average daylight / Average sunshine
Oak Forest, IL

Average daylight / Average sunshine - Oak Forest, IL

The month with the longest days is June (Average daylight: 15h and 6min).
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
Oak Forest, IL

Average sunshine days - Oak Forest, IL

The month with the most sunshine days is November (20.7 days).
The month with the least sunshine days is June (13.1 days).

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Average visibility
Oak Forest, IL

Average visibility - Oak Forest, 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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Oak Forest, Illinois, USA

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