Climate and monthly weather forecast
Marion, IL

Weather in January

January, like December, in Marion, Illinois, is another cold winter month, with an average temperature fluctuating between 26.1°F (-3.3°C) and 39.6°F (4.2°C). The coldest month is January, with an average high-temperature of 39.6°F (4.2°C) and an average low-temperature of 26.1°F (-3.3°C). Weather in January »

Weather in February

The last month of the winter, February, is a chilly month in Marion, Illinois, with an average temperature ranging between max 43.7°F (6.5°C) and min 29.8°F (-1.2°C). In Marion, Illinois, the average high-temperature in February is essentially the same as in January - a frosty 43.7°F (6.5°C). Weather in February »

Weather in March

March, the first month of the spring in Marion, is a cool month, with an average temperature fluctuating between 38.8°F (3.8°C) and 55.2°F (12.9°C). In Marion, the average high-temperature in March increases from a chilly 43.7°F (6.5°C) in February to a fresh 55.2°F (12.9°C). Weather in March »

Weather in April

April in Marion, Illinois, is a comfortable spring month, with an average temperature fluctuating between 66.4°F (19.1°C) and 48.7°F (9.3°C). In Marion, the average high-temperature in April increases from a cool 55.2°F (12.9°C) in March to a comfortable 66.4°F (19.1°C). Weather in April »

Weather in May

The last month of the spring, May, is a moderately hot month in Marion, Illinois, with temperature in the range of an average low of 58.1°F (14.5°C) and an average high of 75.4°F (24.1°C). In Marion, the average high-temperature in May rises from a comfortable 66.4°F (19.1°C) in April to a moderately hot 75.4°F (24.1°C). Weather in May »

Weather in June

June, the first month of the summer in Marion, is also a moderately hot month, with an average temperature varying between 84.7°F (29.3°C) and 66.4°F (19.1°C). In June, the average high-temperature rises from 75.4°F (24.1°C) in May to a still warm 84.7°F (29.3°C). Weather in June »

Weather in July

July is a tropical summer month in Marion, Illinois, with an average temperature fluctuating between 87.4°F (30.8°C) and 68.5°F (20.3°C). The warmest month is July, with an average high-temperature of 87.4°F (30.8°C) and an average low-temperature of 68.5°F (20.3°C). The average heat index in July is appraised at a very hot 102.2°F (39°C). Weather in July »

Weather in August

The last month of the summer, August, is another warm month in Marion, Illinois, with temperature in the range of an average low of 66.4°F (19.1°C) and an average high of 85.6°F (29.8°C). In Marion, Illinois, the average high-temperature in August is relatively the same as in July - a moderately hot 85.6°F (29.8°C). Weather in August »

Weather in September

September, the first month of the autumn in Marion, is still a warm month, with an average temperature ranging between min 60.4°F (15.8°C) and max 80.8°F (27.1°C). In Marion, the average high-temperature in September is almost the same as in August - a still moderately hot 80.8°F (27.1°C). Weather in September »

Weather in October

October, like September, in Marion, Illinois, is another comfortable autumn month, with an average temperature ranging between min 49.3°F (9.6°C) and max 67.3°F (19.6°C). In October, the average high-temperature drops from a warm 80.8°F (27.1°C) in September to a comfortable 67.3°F (19.6°C). Weather in October »

Weather in November

November, the last month of the autumn in Marion, is also a fresh month, with temperature in the range of an average high of 53.8°F (12.1°C) and an average low of 38.5°F (3.6°C). In November, the average high-temperature drops from an enjoyable 67.3°F (19.6°C) in October to a fresh 53.8°F (12.1°C). Weather in November »

Weather in December

December, the first month of the winter in Marion, is also a frosty month, with an average temperature fluctuating between 31.8°F (-0.1°C) and 43.9°F (6.6°C). In December, the average high-temperature drops from a cool 53.8°F (12.1°C) in November to a frosty 43.9°F (6.6°C). Weather in December »
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FAQ

What is the coldest month in Marion?

The coldest month is January, with an average high-temperature of 39.6°F (4.2°C) and an average low-temperature of 26.1°F (-3.3°C).

How much does it rain in Marion?

Throughout the year, there are 137.6 rainfall days, and 23.03" (585mm) of precipitation is accumulated.

When does it snow in Marion?

Months with snowfall in Marion, Illinois, are January through April, October through December.

When does it snow the most in Marion?

The months with the most snowfall in Marion are January and February, with an average 0.94" (24mm) of accumulated snow.

How many days does it snow in Marion?

In Marion, during the entire year, snow falls for 14.5 days and aggregates up to 4.13" (105mm) of snow.

What is the month with the least sunshine in Marion?

January has the least sunshine of the year, with an average of 4.6h of sunshine.

When is the lowest UV index in Marion?

January, February and December, with an average maximum UV index of 2, are months with the lowest UV index in Marion, Illinois.

When is Daylight Saving Time (DST) in Marion?

On Sunday, March 13. 2022, at 2:00 am, Daylight Saving Time starts, and the time zone changes from CST to CDT. Daylight Saving Time ends Sunday, November 6. 2022, at 2:00 am, and the time zone reverts from CDT to CST.

What is the wettest month in Marion?

The month with the most rainfall in Marion, Illinois, is April, when the rain falls for 13.8 days and typically aggregates up to 3.11" (79mm) of precipitation.

What is the most humid month in Marion?

The most humid month is May, with an average relative humidity of 79%.

When it does not snow in Marion?

In Marion, snow does not fall in May through September.

When is the highest UV index in Marion?

The months with the highest UV index in Marion, Illinois, are May through August, with an average maximum UV index of 6.

When are the longest days in Marion?

The month with the longest days in Marion, Illinois, is June, with an average of 14h and 44min of daylight.

What are the months with the most sunshine in Marion?

The months with the most sunshine in Marion, Illinois, are June and July, with an average of 10.5h of sunshine.

What is the warmest month in Marion?

The warmest month in Marion is July, with an average high-temperature of 87.4°F (30.8°C) and an average low-temperature of 68.5°F (20.3°C).

What is the driest month in Marion?

The month with the least rainfall in Marion is September, when the rain falls for 10.5 days and typically collects 1.1" (28mm) of precipitation.

What is the least humid month in Marion?

With an average relative humidity of 71%, October is the least humid month.

What is the month with the shortest days in Marion?

The month with the shortest days in Marion is December, with an average of 9h and 37min of daylight.

Average temperature
Marion, IL

Average temperature - Marion, IL

The warmest month (with the highest average high temperature) is July (87.4°F).
The month with the lowest average high temperature is January (39.6°F).

The month with the highest average low temperature is July (68.5°F).
The coldest month (with the lowest average low temperature) is January (26.1°F).

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Average pressure
Marion, IL

Average pressure - Marion, IL

The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.94"Hg).

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Average wind speed
Marion, IL

Average wind speed - Marion, IL

The windiest months (with the highest average wind speed) are January and February (9.4mph).
The calmest months (with the lowest average wind speed) are July and August (5.8mph).

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Average rainfall
Marion, IL

Average rainfall - Marion, IL

The wettest month (with the highest rainfall) is April (3.11").
The driest month (with the least rainfall) is September (1.1").

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Average rainfall days
Marion, IL

Average rainfall days - Marion, IL

The month with the highest number of rainy days is July (15.3 days).
The month with the least rainy days is November (7.8 days).

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Average snowfall
Marion, IL

Average snowfall - Marion, IL

The months with the highest snowfall are January and February (0.94").
The months with the least snowfall are May, June, July, August and September (0").

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Average snowfall days
Marion, IL

Average snowfall days - Marion, IL

The month with the highest number of snowfall days is February (4.3 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
Marion, IL

Average daylight / Average sunshine - Marion, IL

The month with the longest days is June (Average daylight: 14h and 44min).
The month with the shortest days is December (Average daylight: 9h and 37min).

The months with the most sunshine are June and July (Average sunshine: 10h and 30min).
The month with the least sunshine is January (Average sunshine: 4h and 36min).

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Average sunshine days
Marion, IL

Average sunshine days - Marion, IL

The month with the most sunshine days is October (20.6 days).
The month with the least sunshine days is July (12.9 days).

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Average UV index
Marion, IL

Average UV index - Marion, IL

The months with the highest UV index are May, June, July and August (UV index 6).
The months with the lowest UV index are January, February and December (UV index 2).

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Average visibility
Marion, IL

Average visibility - Marion, 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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