Marion
Illinois, USA
Long-term weather forecast
Long-term weather forecast

Monthly weather forecast and climate
Marion, IL

January, the same as December, is a wintry winter month in Marion, Illinois, with temperature in the range of an average low of 26.1°F (-3.3°C) and an average high of 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 »

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

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

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

May, the last month of the spring, in Marion, is a warm month, with average temperature ranging between min 58.1°F (14.5°C) and max 75.4°F (24.1°C). In May, the average high-temperature increases, from a comfortable 66.4°F (19.1°C) in April, to a warm 75.4°F (24.1°C). Weather in May »

The first month of the summer, June, is also a moderately hot month in Marion, Illinois, with average temperature fluctuating between 84.7°F (29.3°C) and 66.4°F (19.1°C). In June, the average high-temperature rises, 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 »

July in Marion, Illinois, is a tropical summer month, with average temperature ranging between min 68.5°F (20.3°C) and max 87.4°F (30.8°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 a torrid 102.6°F (39.2°C). Weather in July »

August, the last month of the summer, in Marion, is another warm month, with average temperature ranging between min 66.4°F (19.1°C) and max 85.6°F (29.8°C). In August, the average high-temperature is practically the same as in July - a warm 85.6°F (29.8°C). Weather in August »

The first month of the autumn, September, is still a warm month in Marion, Illinois, with 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 relatively the same as in August - a still warm 80.8°F (27.1°C). Weather in September »

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

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 cool 53.8°F (12.1°C). Weather in November »

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

What is the coldest month in Marion?

January is the coldest month in Marion, Illinois, 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?

In Marion, during the entire year, the rain falls for 137.6 days and collects up to 23.03" (585mm) of precipitation.

When does it snow in Marion?

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

How much does it snow in Marion?

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

When does it snow the most in Marion?

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

What is the month with the least sunshine in Marion?

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

What are the months 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 in Marion.

What is the rainiest month in Marion?

April is the month with the most rainfall in Marion, Illinois. 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?

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

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

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

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, Illinois.

What are the months with the most sunshine in Marion?

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

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 is December, with an average of 9.6h of daylight.
Average temperature - Marion, IL
Average rainfall - Marion, IL

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

Average rainfall days - Marion, IL

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

Average snowfall - Marion, IL

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

Average snowfall days - Marion, IL

The month with the highest number of snowfall days is February (4.3 days).
Months with the lowest number of snowfall days are May, June, July, August and September (0 days).

Average daylight / Average sunshine - Marion, IL

The month with the longest days is June (Average daylight: 14.7h).
The month with shortest days is December (Average daylight: 9.6h).

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

Average UV index - Marion, IL