May weather forecast
Charleston, IL

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Weather in May

May, the last month of the spring in Charleston, is an agreeable month, with temperature in the range of an average high of 73°F (22.8°C) and an average low of 56.7°F (13.7°C).

Temperature

Charleston's weather in May presents a rise in the average high-temperature, moving from a comfortable 62.2°F (16.8°C) in April to an agreeable 73°F (22.8°C). Throughout May, the average low-temperature records at a refreshing 56.7°F (13.7°C).

Humidity

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

Rainfall

In Charleston, in May, during 16.8 rainfall days, 2.87" (73mm) of precipitation is typically accumulated. Throughout the year, in Charleston, there are 148 rainfall days, and 25.63" (651mm) of precipitation is accumulated.

Snowfall

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

Daylight

The average length of the day in May is 14h and 22min.
On the first day of the month, sunrise is at 5:52 am and sunset at 7:46 pm. On the last day of May, sunrise is at 5:27 am and sunset at 8:13 pm CDT.

Sunshine

In Charleston, the average sunshine in May is 8.8h.

UV index

In May, the average daily maximum UV index in Charleston is 5. A UV Index estimate of 3 to 5 represents a medium health hazard from exposure to the Sun's UV radiation for the ordinary person.
Note: The maximum UV index, 5 during May, leads to the following recommendations:
Take necessary precautions - Protection from skin and eye injury is mandatory. Considering the harmful UV rays from the Sun during midday, it's essential to reduce exposure. On sunny days, it's ideal to wear sunglasses that filter out UVA and UVB rays.
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Frequently asked questions

What are the temperatures in Charleston in May?

Charleston in May has an average high-temperature of 73°F (22.8°C) and an average low-temperature of 56.7°F (13.7°C).

What is the average humidity in May in Charleston?

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

How much does it rain in Charleston in May?

In Charleston, during May, the rain falls for 16.8 days and regularly aggregates up to 2.87" (73mm) of precipitation.

When it does not snow in Charleston?

May through September are months without snowfall.

Does it snow in Charleston in May?

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

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

In May, the average day length is 14h and 22min.

What time are sunrise and sunset in May in Charleston?

In May, on the first day of the month, sunrise is at 5:52 am and sunset at 7:46 pm. On the last day of the month, in Charleston, Illinois, sunrise is at 5:27 am and sunset at 8:13 pm CDT.

How long on average sun shines in May in Charleston?

In May, the average sunshine duration in Charleston, Illinois, is 8.8h.

What is the UV index reading in May in Charleston?

In Charleston, the average daily maximum UV index in May is 5. A UV Index reading of 3 to 5 represents a medium health risk from exposure to the Sun's UV radiation.
Average humidity
Average rainfall days
Average snowfall
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in May
Charleston, IL

Average temperature in May - Charleston, IL
  • Average high temperature in May: 73°F

The warmest month (with the highest average high temperature) is July (82°F).
The month with the lowest average high temperature is January (34°F).

  • Average low temperature in May: 56.7°F

The month with the highest average low temperature is July (65.8°F).
The coldest month (with the lowest average low temperature) is January (21.9°F).

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Average pressure in May
Charleston, IL

Average pressure in May - Charleston, IL
  • Average pressure in May: 29.96"Hg

The month with the highest atmospheric pressure is January (30.15"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).

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Average wind speed in May
Charleston, IL

Average wind speed in May - Charleston, IL
  • Average wind speed in May: 8.6mph

The windiest month (with the highest average wind speed) is January (10.7mph).
The calmest month (with the lowest average wind speed) is July (6.2mph).

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Average humidity in May
Charleston, IL

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

The month with the highest relative humidity is July (83%).
The month with the lowest relative humidity is October (70%).

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Average rainfall in May
Charleston, IL

Average rainfall in May - Charleston, IL
  • Average rainfall in May: 2.87"

The wettest month (with the highest rainfall) is April (3.31").
The driest month (with the least rainfall) is February (1.3").

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Average rainfall days in May
Charleston, IL

Average rainfall days in May - Charleston, IL
  • Average rainfall days in May: 16.8 days

The month with the highest number of rainy days is May (16.8 days).
The month with the least rainy days is February (7.8 days).

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Average snowfall in May
Charleston, IL

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

The month with the highest snowfall is December (2.13").
The months with the least snowfall are May, June, July, August and September (0").

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Average snowfall days in May
Charleston, IL

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

The month with the highest number of snowfall days is January (8.1 days).
The 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
Charleston, IL

Average daylight in May / Average sunshine in May - Charleston, IL
  • Average daylight in May: 14h and 2min

The month with the longest days is June (Average daylight: 14h and 54min).
The month with the shortest days is December (Average daylight: 9h and 24min).

  • Average sunshine in May: 8h and 5min

The month with the most sunshine is June (Average sunshine: 10h and 18min).
The month with the least sunshine is January (Average sunshine: 4h and 0min).

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Average sunshine days in May
Charleston, IL

Average sunshine days in May - Charleston, IL
  • Average sunshine days in May: 11.2 days

The month with the most sunshine days is October (18.3 days).
The month with the least sunshine days is July (10.6 days).

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Average UV index in May
Charleston, IL

Average UV index in May - Charleston, IL
  • Average UV index in May: 5

The months with the highest UV index are June, July and August (UV index 6).
The month with the lowest UV index is December (UV index 1).

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Average cloud cover in May
Charleston, IL

Average cloud cover in May - Charleston, IL
  • Average cloud cover in May: 41

The month with the most cloud cover is January (Cloud cover 56).
The month with the least cloud cover is June (Cloud cover 31).

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Average visibility in May
Charleston, IL

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

The months with the highest visibility are January, February, March, April, May, June, September, October, November and December (6mi).
The months with the lowest visibility are July and August (5mi).

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Charleston, Illinois, USA

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