May weather forecast
Berwyn, IL

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Weather in May

In May, Berwyn experiences further upliftment in temperature, marking a transit towards the forthcoming summer season. As the temperatures soar compared to April, locals start preparing for the hotter months ahead. The highlight of weather conditions in May is its maximum temperature averaging around 64.9°F (18.3°C). Accompanied by longer daylight hours and reduced cloud cover, May offers essential weather ingredients for outdoor enthusiasts in Berwyn. Expanded sunshine hours during this month also enhance the visibility, contributing to clear skies and vibrant weather.

Temperature

Berwyn's transition into May is marked by a temperature shift, moving from a cool 53.8°F (12.1°C) in April to a comfortable 64.9°F (18.3°C). Berwyn usually reports an average low-temperature of 51.4°F (10.8°C) during the month of May.

Humidity

The average relative humidity in May is 76%.

Rainfall

May is the month with the most rainfall. Rain falls for 11.3 days and accumulates 1.1" (28mm) of precipitation.

Snowfall

May through September are months without snowfall.

Daylight

In May, the average length of the day is 14h and 34min.
On the first day of May, 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 8:19 pm CDT.

Sunshine

The average sunshine in May is 8.8h.

UV index

The average daily maximum UV index in May is 5. A UV Index value of 3 to 5 symbolizes a moderate threat to health from exposure to the Sun's UV radiation for the ordinary person.
Note: In May, the average maximum UV index of 5 translates into the following recommendations:
Exercise prudence. Persons with fair skin could be burned in under 30 minutes. Avoiding the Sun during its peak radiation time around midday is a healthy practice. Enhance your sun protection with tightly woven, yet airy clothing.

Frequently asked questions

What are the temperatures in May?

An average high-temperature, in May, in Berwyn, is 64.9°F (18.3°C) and the average low-temperature is 51.4°F (10.8°C).

What is the average humidity in May?

The average relative humidity in May is 76%.

What is the wettest month?

The month with the most rainfall is May, when the rain falls for 11.3 days and typically aggregates up to 1.1" (28mm) of precipitation.

How many days does it rain in May?

In Berwyn, in May, during 11.3 rainfall days, 1.1" (28mm) of precipitation is typically accumulated.

When it does not snow in Berwyn?

May through September are months without snowfall.

Does it snow in Berwyn in May?

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

How many hours of daylight does Berwyn have in May?

In May, the average day length is 14h and 34min.

When 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 8:19 pm CDT.

How long on average sun shines in May?

In May, the average sunshine duration is 8.8h.

What is the UV index reading in May?

In Berwyn, the average daily maximum UV index in May is 5. A UV Index value of 3 to 5 symbolizes a moderate vulnerability 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
Berwyn, IL

Average temperature in May - Berwyn, IL
  • Average high temperature in May: 64.9°F

The warmest month (with the highest average high temperature) is July (80.4°F).
The month with the lowest average high temperature is January (29.1°F).

  • Average low temperature in May: 51.4°F

The month with the highest average low temperature is July (67.1°F).
The coldest month (with the lowest average low temperature) is January (19.2°F).

Average pressure in May
Berwyn, IL

Average pressure in May - Berwyn, 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
Berwyn, IL

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

The windiest month (with the highest average wind speed) is January (10.9mph).
The calmest month (with the lowest average wind speed) is August (6.8mph).

Average humidity in May
Berwyn, IL

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

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
Berwyn, IL

Average rainfall in May - Berwyn, IL
  • Average rainfall in May: 1.1"

The wettest month (with the highest rainfall) is May (1.1").
The driest months (with the least rainfall) are February, March, November and December (0.39").

Average rainfall days in May
Berwyn, IL

Average rainfall days in May - Berwyn, IL
  • Average rainfall days in May: 11.3 days

The month with the highest number of rainy days is June (11.7 days).
The month with the least rainy days is January (3.1 days).

Average snowfall in May
Berwyn, IL

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

The month with the highest snowfall is February (1.38").
The months with the least snowfall are May, June, July, August and September (0").

Average snowfall days in May
Berwyn, IL

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

The month with the highest number of snowfall days is February (7.3 days).
The months with the least snowfall days are May, June, July, August and September (0 days).

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

Average daylight in May / Average sunshine in May - Berwyn, 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 5min

The month with the most sunshine is August (Average sunshine: 10h and 36min).
The month with the least sunshine is January (Average sunshine: 3h and 48min).

Average sunshine days in May
Berwyn, IL

Average sunshine days in May - Berwyn, IL
  • Average sunshine days in May: 15.4 days

The month with the most sunshine days is December (23.7 days).
The month with the least sunshine days is June (14.3 days).

Average UV index in May
Berwyn, IL

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

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

Average cloud cover in May
Berwyn, IL

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

The month with the most cloud cover is January (Cloud cover 61).
The month with the least cloud cover is August (Cloud cover 27).

Average visibility in May
Berwyn, IL

Average visibility in May - Berwyn, 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).

Berwyn, Illinois, USA

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