Climate and monthly weather forecast
Marion, IL

Weather in January

January, like December, in Marion, Illinois, is a wintry winter month, with average temperature varying between 39.6°F (4.2°C) and 26.1°F (-3.3°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 average temperature ranging between min 29.8°F (-1.2°C) and max 43.7°F (6.5°C). In February, the average high-temperature is almost 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 average temperature varying between 38.8°F (3.8°C) and 55.2°F (12.9°C). In Marion, Illinois, the average high-temperature increases, from a chilly 43.7°F (6.5°C) in February, to a cool 55.2°F (12.9°C). Weather in March »

Weather in April

April in Marion, Illinois, is an enjoyable spring month, with average temperature fluctuating between 66.4°F (19.1°C) and 48.7°F (9.3°C). In April, the average high-temperature increases, from a fresh 55.2°F (12.9°C) in March, to an enjoyable 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 average temperature fluctuating between 75.4°F (24.1°C) and 58.1°F (14.5°C). In May, the average high-temperature rises, from a comfortable 66.4°F (19.1°C) in April, to a warm 75.4°F (24.1°C). Weather in May »

Weather in June

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

Weather in July

July in Marion, Illinois, is a hot summer month, with average temperature varying between 87.4°F (30.8°C) and 68.5°F (20.3°C). July is the warmest month, 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 calculated to be a sweltering 102.6°F (39.2°C). Weather in July »

Weather in August

August, the last month of the summer, in Marion, is also a moderately hot month, 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, the average high-temperature in August is almost the same as in July - a moderately hot 85.6°F (29.8°C). Weather in August »

Weather in September

The first month of the autumn, September, is also a moderately hot month in Marion, Illinois, with temperature in the range of an average low of 60.4°F (15.8°C) and an average high of 80.8°F (27.1°C). In Marion, the average high-temperature in September is practically 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 average temperature varying between 49.3°F (9.6°C) and 67.3°F (19.6°C). In October, the average high-temperature decreases, from a warm 80.8°F (27.1°C) in September, to an enjoyable 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 average temperature fluctuating between 38.5°F (3.6°C) and 53.8°F (12.1°C). In Marion, the average high-temperature drops, from an enjoyable 67.3°F (19.6°C) in October, to a cool 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 temperature in the range of an average low of 31.8°F (-0.1°C) and an average high of 43.9°F (6.6°C). In Marion, the average high-temperature in December decreases, 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?

January is the coldest month, 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 many days does it rain in Marion?

Throughout the year, in Marion, Illinois, 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.

What is the snowiest month in Marion?

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

How many days does it snow in Marion?

Throughout the year, in Marion, Illinois, there are 14.5 snowfall days, and 4.13" (105mm) of snow is accumulated.

What is the month with the least sunshine in Marion?

The month with the least sunshine is January, with an average of 4.6h of sunshine.

What is the month with 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.

What is the rainiest month in Marion?

April is the month with the most rainfall. Rain falls for 13.8 days and accumulates 3.11" (79mm) of precipitation.

What is the most humid month in Marion?

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

When it does not snow in Marion?

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

What is the month with the highest UV index in Marion?

Months with the highest UV index are May through August, with an average maximum UV index of 6.

When are the longest days in Marion?

With an average of 14.7h of daylight, June has the longest days of the year in Marion.

What is the month with the most sunshine in Marion?

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

What is the warmest month in Marion?

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).

What is the driest month in Marion?

September is the month with the least rainfall in Marion. Rain falls for 10.5 days and accumulates 1.1" (28mm) of precipitation.

What is the least humid month in Marion?

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

What is the month with the shortest days in Marion?

The month with the shortest days is December, with an average of 9.6h 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").
The month with the lowest atmospheric pressure is June (29.94").

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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

Months with the highest snowfall are January and February (0.94").
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).
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: 14.7h).
The month with the shortest days is December (Average daylight: 9.6h).

Months with the most sunshine are June and July (Average sunshine: 10.5h).
The month with the least sunshine is January (Average sunshine: 4.6h).

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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

Months with the highest UV index are May, June, July and August (UV index 6).
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

Months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
Months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).

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