May weather forecast
Wheaton, IL

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Weather in May

May sees the full bloom of spring in Wheaton, with warmer temperatures and increasingly longer days. It marks the break from the cold weather, as temperatures range in the more pleasant high 60s°F. Sunlight envelopes most of the day, and a significant increase in UV index is noted. Being the second rainiest month of the year can result in high grass growth and plant fecundity. Enjoy the outdoors during May in Wheaton, but do not forget a raincoat or an umbrella.

Temperature

May's onset is marked by a temperature increase, moving from a mild 56.3°F (13.5°C) in April to an agreeable 68.5°F (20.3°C). Wheaton, in May, witnesses an average low-temperature of 51.8°F (11°C).

Humidity

In May, the average relative humidity is 76%.

Rainfall

May is the month with the most rainfall. Rain falls for 19.2 days and accumulates 4.45" (113mm) of precipitation.

Snowfall

January through May, October through December are months with snowfall in Wheaton. May is the last month it regularly snows in Wheaton. During 0.1 snowfall days, in May, Wheaton aggregates 0.04" (1mm) of snow. In Wheaton, during the entire year, snow falls for 47 days and aggregates up to 20.2" (513mm) of snow.

Daylight

The average length of the day in May is 14h and 34min.
On the first day of the month, sunrise is at 5:47 am and sunset at 7:51 pm. On the last day of May, in Wheaton, sunrise is at 5:19 am and sunset at 8:20 pm CDT.

Sunshine

In Wheaton, the average sunshine in May is 8.5h.

UV index

In May, the average daily maximum UV index is 5. A UV Index estimate of 3 to 5 represents a medium vulnerability from exposure to the Sun's UV radiation for ordinary individuals.
Note: In May, the average maximum UV index of 5 translates into the following recommendations:
Prioritize safety - The need to safeguard skin and eyes from harm is emphasized. Avoid the Sun's strongest UV rays by seeking shade and limiting exposure during midday. Boost your sun resistance with garments that are densely woven yet spacious. Heed this! Snow reflection can almost augment the UV radiation of the sun by double.
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Frequently asked questions

What is the usual temperature for Wheaton in May?

In May, the average high-temperature and low-temperature are 68.5°F (20.3°C) and 51.8°F (11°C) respectively.

What is the average humidity in May in Wheaton?

In Wheaton, the average relative humidity in May is 76%.

What is the wettest month in Wheaton?

The month with the most rainfall in Wheaton, Illinois, is May, when the rain falls for 19.2 days and typically aggregates up to 4.45" (113mm) of precipitation.

How many days does it rain in May in Wheaton?

In Wheaton, in May, it is raining for 19.2 days, with typically 4.45" (113mm) of accumulated precipitation.

What is the last month it snows in Wheaton?

May is the last month it regularly snows in Wheaton, Illinois. During 0.1 snowfall days, in May, Wheaton aggregates 0.04" (1mm) of snow.

How many hours of daylight does Wheaton have in May?

The average day length in May in Wheaton, Illinois, is 14h and 34min.

When is the sunrise / sunset in May in Wheaton?

On the first day of May, sunrise is at 5:47 am and sunset at 7:51 pm. On the last day of the month, sunrise is at 5:19 am and sunset at 8:20 pm CDT.

How long on average sun shines in May in Wheaton?

The average sunshine duration in May in Wheaton is 8.5h.

What is the UV index intensity in May in Wheaton?

In May, the average daily maximum UV index in Wheaton, Illinois, is 5. A UV Index reading of 3 to 5 represents a moderate vulnerability from unsafe exposure to Sun's UV rays.
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
Wheaton, IL

Average temperature in May - Wheaton, IL
  • Average high temperature in May: 68.5°F

The warmest month (with the highest average high temperature) is July (81.7°F).
The month with the lowest average high temperature is January (28°F).

  • Average low temperature in May: 51.8°F

The month with the highest average low temperature is July (65.3°F).
The coldest month (with the lowest average low temperature) is January (16.7°F).

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Average pressure in May
Wheaton, IL

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

The month with the highest atmospheric pressure is January (30.11"Hg).
The month with the lowest atmospheric pressure is June (29.92"Hg).

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Average wind speed in May
Wheaton, IL

Average wind speed in May - Wheaton, IL
  • Average wind speed in May: 8.1mph

The windiest month (with the highest average wind speed) is January (9.8mph).
The calmest month (with the lowest average wind speed) is August (6mph).

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Average humidity in May
Wheaton, IL

Average humidity in May - Wheaton, IL
  • Average humidity in May: 76%

The months with the highest relative humidity are January and February (83%).
The month with the lowest relative humidity is October (73%).

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Average rainfall in May
Wheaton, IL

Average rainfall in May - Wheaton, IL
  • Average rainfall in May: 4.45"

The wettest month (with the highest rainfall) is May (4.45").
The driest months (with the least rainfall) are November and December (1.65").

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Average rainfall days in May
Wheaton, IL

Average rainfall days in May - Wheaton, IL
  • Average rainfall days in May: 19.2 days

The month with the highest number of rainy days is July (20.1 days).
The month with the least rainy days is February (5.8 days).

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Average snowfall in May
Wheaton, IL

Average snowfall in May - Wheaton, IL
  • Average snowfall in May: 0.04"

The month with the highest snowfall is January (5.87").
The months with the least snowfall are June, July, August and September (0").

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Average snowfall days in May
Wheaton, IL

Average snowfall days in May - Wheaton, IL
  • Average snowfall days in May: 0.1 days

The month with the highest number of snowfall days is January (13.1 days).
The months with the least snowfall days are June, July, August and September (0 days).

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Average daylight in May /
Average sunshine in May
Wheaton, IL

Average daylight in May / Average sunshine in May - Wheaton, IL
  • Average daylight in May: 14h and 4min

The month with the longest days is June (Average daylight: 15h and 12min).
The month with the shortest days is December (Average daylight: 9h and 12min).

  • Average sunshine in May: 8h and 3min

The month with the most sunshine is August (Average sunshine: 9h and 54min).
The month with the least sunshine is January (Average sunshine: 3h and 42min).

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Average sunshine days in May
Wheaton, IL

Average sunshine days in May - Wheaton, IL
  • Average sunshine days in May: 9.4 days

The month with the most sunshine days is November (16.1 days).
The month with the least sunshine days is July (8.2 days).

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Average UV index in May
Wheaton, IL

Average UV index in May - Wheaton, 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 January (UV index 1).

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Average cloud cover in May
Wheaton, IL

Average cloud cover in May - Wheaton, IL
  • Average cloud cover in May: 43

The month with the most cloud cover is January (Cloud cover 61).
The months with the least cloud cover are August and September (Cloud cover 32).

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Average visibility in May
Wheaton, IL

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

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

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Wheaton, Illinois, USA

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