Monthly weather forecast and climate
Marion, IL

What is the coldest month in Marion?

January is the coldest month in Marion, Illinois, with an average high-temperature of 39.2°F (4°C) and an average low-temperature of 21.2°F (-6°C).

How many days does it rain in Marion?

In Marion, during the entire year, the rain falls for 113 days and collects up to 45.4" (1154mm) of precipitation.

What is the driest month in Marion?

January is the month with the least rainfall in Marion, Illinois. Rain falls for 9 days and accumulates 2.8" (72mm) of precipitation.

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

Months with the lowest UV index are January and December, with an average UV index of 2.

What is the wettest month in Marion?

Months with the most rainfall in Marion are March and May, with an average 4.9" (124mm) of precipitation.

What is the warmest month in Marion?

The warmest month in Marion, Illinois, is July, with an average high-temperature of 89.6°F (32°C) and an average low-temperature of 66.2°F (19°C).

What is the month with highest UV index in Marion?

With an average UV index of 10, July is the month with the highest UV index in Marion, Illinois.
Average rainfall - Marion, IL
Average rainfall days - Marion, IL

The month with the highest number of rainy days is March (12 days).
Months with the lowest number of rainy days are August, September and October (8 days).

Average daylight / Average sunshine - Marion, IL
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