May weather forecast
Des Plaines, IL

Share

Weather in May

May solidifies the presence of spring in Des Plaines with rising temperatures and longer daylight hours. Just a glimpse of the winter chill remains, and the city relishes the warmer weather. Greenery flourishes across the city due to the higher rainfall recorded in May, peaking at 4.21" (107mm). As the month progresses, the temperatures and daylight hours rise, marking the slow transition to summer. These conditions persist as the city prepares to embrace the warmer summer months of June and July.

Temperature

The beginning of May signals a rise in the average high-temperature, moving from a fresh 53.2°F (11.8°C) in April to an enjoyable 64.6°F (18.1°C). Des Plaines registers a consistent average low-temperature of 50.7°F (10.4°C) during May.

Humidity

The average relative humidity in May is 77%.

Rainfall

The month with the most rainfall is May, when the rain falls for 18.5 days and typically aggregates up to 4.21" (107mm) of precipitation.

Snowfall

January through May, October through December are months with snowfall in Des Plaines. May is the last month it regularly snows. During 0.1 snowfall days, in May, Des Plaines aggregates 0.08" (2mm) of snow. Throughout the year, there are 41.4 snowfall days, and 17.52" (445mm) of snow is accumulated.

Daylight

The average length of the day in May is 14h and 35min.
On the first day of the month, sunrise is at 5:46 am and sunset at 7:50 pm. On the last day of May, sunrise is at 5:18 am and sunset at 8:20 pm CDT.

Sunshine

The average sunshine in May is 8.5h.

UV index

The average daily maximum UV index in May in Des Plaines is 5. A UV Index estimate of 3 to 5 represents a moderate health risk from exposure to the Sun's UV rays for the average person.
Note: The maximum UV index of 5 during May leads to these instructions:
Proceed with care. Light skin individuals may be exposed to burns in fewer than 30 minutes. Direct exposure to the Sun's intense radiation around midday should be avoided for health reasons. Sun-related eye harm can be minimized with proper sunglasses offering UVA and UVB coverage. Bear in mind! The Sun's UV radiation can nearly double in intensity due to the reflective quality of snow.

Frequently asked questions

What are the temperatures in May?

Des Plaines in May has an average high-temperature of 64.6°F (18.1°C) and an average low-temperature of 50.7°F (10.4°C).

What is the average humidity in May?

In Des Plaines, the average relative humidity in May is 77%.

What is the rainiest month?

May is the month with the most rainfall. Rain falls for 18.5 days and accumulates 4.21" (107mm) of precipitation.

How many days does it rain in May?

In Des Plaines, during May, the rain falls for 18.5 days and regularly aggregates up to 4.21" (107mm) of precipitation.

What is the last month it snows?

May is the last month it regularly snows. During 0.1 snowfall days, in May, Des Plaines aggregates 0.08" (2mm) of snow.

What is the average length of the day in May?

The average day length in May is 14h and 35min.

What time are sunrise and sunset in May?

In May, on the first day of the month, sunrise is at 5:46 am and sunset at 7:50 pm. On the last day of the month, sunrise is at 5:18 am and sunset at 8:20 pm CDT.

How long on average sun shines in May?

In Des Plaines, the average sunshine duration in May is 8.5h.

How high is the UV index in May?

In Des Plaines, the average daily maximum UV index in May is 5. A UV Index estimate of 3 to 5 represents a moderate health threat from unprotected exposure to UV radiation.
Average humidity
Average rainfall days
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in May
Des Plaines, IL

Average temperature in May - Des Plaines, IL
  • Average high temperature in May: 64.6°F

The warmest month (with the highest average high temperature) is July (80.6°F).
The month with the lowest average high temperature is January (28.8°F).

  • Average low temperature in May: 50.7°F

The month with the highest average low temperature is July (66.9°F).
The coldest month (with the lowest average low temperature) is January (18.1°F).

Average pressure in May
Des Plaines, IL

Average pressure in May - Des Plaines, 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).

Average wind speed in May
Des Plaines, IL

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

The windiest month (with the highest average wind speed) is January (10.8mph).
The calmest month (with the lowest average wind speed) is August (6.8mph).

Average humidity in May
Des Plaines, IL

Average humidity in May - Des Plaines, IL
  • Average humidity in May: 77%

The months with the highest relative humidity are January and February (82%).
The month with the lowest relative humidity is October (72%).

Average rainfall in May
Des Plaines, IL

Average rainfall in May - Des Plaines, IL
  • Average rainfall in May: 4.21"

The wettest month (with the highest rainfall) is May (4.21").
The driest month (with the least rainfall) is December (1.5").

Average rainfall days in May
Des Plaines, IL

Average rainfall days in May - Des Plaines, IL
  • Average rainfall days in May: 18.5 days

The month with the highest number of rainy days is May (18.5 days).
The month with the least rainy days is February (5.3 days).

Average snowfall in May
Des Plaines, IL

Average snowfall in May - Des Plaines, IL
  • Average snowfall in May: 0.08"

The month with the highest snowfall is February (4.84").
The months with the least snowfall are June, July, August and September (0").

Average snowfall days in May
Des Plaines, IL

Average snowfall days in May - Des Plaines, IL
  • Average snowfall days in May: 0.1 days

The month with the highest number of snowfall days is January (10.6 days).
The months with the least snowfall days are June, July, August and September (0 days).

Average daylight in May /
Average sunshine in May
Des Plaines, IL

Average daylight in May / Average sunshine in May - Des Plaines, 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 months with the most sunshine are July and August (Average sunshine: 10h and 18min).
The month with the least sunshine is January (Average sunshine: 3h and 42min).

Average sunshine days in May
Des Plaines, IL

Average sunshine days in May - Des Plaines, IL
  • Average sunshine days in May: 10.5 days

The months with the most sunshine days are November and December (16.9 days).
The month with the least sunshine days is April (10.4 days).

Average UV index in May
Des Plaines, IL

Average UV index in May - Des Plaines, 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).

Average cloud cover in May
Des Plaines, IL

Average cloud cover in May - Des Plaines, IL
  • Average cloud cover in May: 43

The month with the most cloud cover is January (Cloud cover 62).
The months with the least cloud cover are July and August (Cloud cover 29).

Average visibility in May
Des Plaines, IL

Average visibility in May - Des Plaines, IL
  • Average visibility in May: 6mi

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

Des Plaines, Illinois, USA

Weather forecast for your location

1. Click Locate me button
2. Allow the app to use your location