May weather forecast and climate
Marion, IL

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).

Temperature

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). In May, in Marion, the average low-temperature is 58.1°F (14.5°C).

Humidity

With an average relative humidity of 79%, May is the most humid month in Marion.

Rainfall

In May, the rain falls for 15.1 days. Throughout May, 2.52" (64mm) of precipitation is accumulated. In Marion, during the entire year, the rain falls for 137.6 days and collects up to 23.03" (585mm) of precipitation.

Snowfall

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

Daylight

In May, the average length of the day is 14.2h.

Sunshine

In May, the average sunshine in Marion, Illinois, is 9.2h.

UV index

May through August, with an average maximum UV index of 6, are months with the highest UV index in Marion. A UV Index estimate of 6 to 7 represents a high health vulnerability from the exposure to the Sun's UV radiation for the ordinary person.
Note: In May, the average maximum UV index of 6 translate into the following recommendations:
Take precautions against overexposure. Protection against sun damage is needed. Seek shade and minimize exposure to direct Sun in a period between 10 a.m. and 4 p.m. when UV radiation is most intense; keep in mind that shade structures like parasols or canopies do not provide perfect sun protection. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects.
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FAQ

What is the most humid month in Marion?

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

What is the average humidity in May in Marion?

In Marion, Illinois, the average relative humidity in May is 79%.

How many days does it rain in May in Marion?

In Marion, Illinois, during May, the rain falls for 15.1 days and regularly aggregates up to 2.52" (64mm) of precipitation.

When it does not snow in Marion?

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

Does it snow in Marion in May?

In May, in Marion, it doesn't snow. April is the latest month when it typically snows.

What is the average length of the day in May in Marion?

In Marion, Illinois, the average length of the day in May is 14.2h.

How many hours of sunshine does Marion have in May?

In May, the average sunshine in Marion, Illinois, is 9.2h.

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

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

What is the UV index reading in May in Marion?

In Marion, the average daily maximum UV index in May is 6. A UV Index reading of 6 to 7 represents a high health vulnerability from unsafe exposure to the Sun's UV rays.

Average temperature in May
Marion, IL

Average temperature in May - Marion, IL
  • Average high temperature in May: 75.4°F

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).

  • Average low temperature in May: 58.1°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 in May
Marion, IL

Average pressure in May - Marion, IL
  • Average pressure in May: 29.97"

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 in May
Marion, IL

Average wind speed in May - Marion, IL
  • Average wind speed in May: 7.6mph

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 humidity in May
Marion, IL

Average humidity in May - Marion, IL
  • Average humidity in May: 79%

The month with the highest relative humidity is May (79%).
The month with the lowest relative humidity is October (71%).

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Average rainfall in May
Marion, IL

Average rainfall in May - Marion, IL
  • Average rainfall in May: 2.52"

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 in May
Marion, IL

Average rainfall days in May - Marion, IL
  • Average rainfall days in May: 15.1 days

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 in May
Marion, IL

Average snowfall in May - Marion, IL
  • Average snowfall in May: 0"

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 in May
Marion, IL

Average snowfall days in May - Marion, IL
  • Average snowfall days in May: 0 days

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 in May /
Average sunshine in May
Marion, IL

Average daylight in May / Average sunshine in May - Marion, IL
  • Average daylight in May: 14.2h

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

  • Average sunshine in May: 9.2h

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 in May
Marion, IL

Average sunshine days in May - Marion, IL
  • Average sunshine days in May: 13.3 days

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 in May
Marion, IL

Average UV index in May - Marion, IL
  • Average UV index in May: 6

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 cloud cover in May
Marion, IL

Average cloud cover in May - Marion, IL
  • Average cloud cover in May: 39

The month with the most cloud cover is February (Cloud cover 51).
Months with the least cloud cover are June, August and September (Cloud cover 28).

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Average visibility in May
Marion, IL

Average visibility in May - Marion, IL
  • Average visibility in May: 6mi

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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