May weather forecast
Naperville, IL

A covered bridge over a river along the famous Naperville Riverwalk in Naperville, Illinois
A covered bridge over a river along the famous Naperville Riverwalk in Naperville, Illinois

Weather in May

May, the last month of the spring, in Naperville, is an agreeable month, with average temperature varying between 51.8°F (11°C) and 69.1°F (20.6°C).

Temperature

In May, the average high-temperature rises, from a mild 56.8°F (13.8°C) in April, to a pleasant 69.1°F (20.6°C). In Naperville, in May, the average low-temperature is 51.8°F (11°C).

Humidity

In Naperville, the average relative humidity is 76%.

Rainfall

The month with the most rainfall in Naperville, Illinois, is May when the rain falls for 14.8 days and typically aggregates up to 2.09" (53mm) of precipitation.

Snowfall

May through September are months without snowfall.

Daylight

In Naperville, Illinois, the average length of the day in May is 14.6h.

Sunshine

In Naperville, Illinois, the average sunshine is 8.6h.

UV index

In Naperville, the average daily maximum UV index in May is 5. A UV Index of 3 to 5 symbolizes a moderate health risk from unsafe exposure to the UV radiation for the average person.
Note: The daily maximum UV index of 5 interpret into the following advice:
Take precautions - Protection against sunburn is recommended. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. A wide-brim hat offers excellent sun protection for eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Tightly woven, loose-fitting clothes provide additional protection from the Sun. Caution! The reflection of snow can nearly double the intensity of the Sun's UV radiation.
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FAQ

What is the average humidity in May in Naperville?

The average relative humidity in May in Naperville, Illinois, is 76%.

What is the rainiest month in Naperville?

May is the month with the most rainfall in Naperville, Illinois. Rain falls for 14.8 days and accumulates 2.09" (53mm) of precipitation.

How many days does it rain in May in Naperville?

In Naperville, in May, during 14.8 rainfall days, 2.09" (53mm) of precipitation is typically accumulated.

When it does not snow in Naperville?

In Naperville snow does not fall in May through September.

Does it snow in Naperville in May?

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

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

In Naperville, Illinois, the average length of the day in May is 14.6h.

How long on average sun shines in May in Naperville?

In Naperville, the average sunshine in May is 8.6h.

What is the UV index reading in May in Naperville?

The average daily maximum UV index in May in Naperville, Illinois, is 5. A UV Index value of 3 to 5 symbolizes a medium hazard to health from unsafe exposure to the Sun's UV rays.

Average temperature in May
Naperville, IL

Average temperature in May - Naperville, IL
  • Average high temperature in May: 69.1°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 (28.4°F).

  • Average low temperature in May: 51.8°F

The month with the highest average low temperature is July (65.1°F).
The coldest month (with the lowest average low temperature) is January (17.1°F).

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Average pressure in May
Naperville, IL

Average pressure in May - Naperville, IL
  • Average pressure in May: 29.96"

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

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Average wind speed in May
Naperville, IL

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

The windiest month (with the highest average wind speed) is January (9.7mph).
The calmest month (with the lowest average wind speed) is August (6mph).

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Average humidity in May
Naperville, IL

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

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
Naperville, IL

Average rainfall in May - Naperville, IL
  • Average rainfall in May: 2.09"

The wettest month (with the highest rainfall) is May (2.09").
The driest month (with the least rainfall) is December (0.71").

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Average rainfall days in May
Naperville, IL

Average rainfall days in May - Naperville, IL
  • Average rainfall days in May: 14.8 days

The month with the highest number of rainy days is July (17.3 days).
The month with the least rainy days is February (4.4 days).

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Average snowfall in May
Naperville, IL

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

The month with the highest snowfall is January (1.85").
Months with the least snowfall are May, June, July, August and September (0").

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Average snowfall days in May
Naperville, IL

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

The month with the highest number of snowfall days is January (11.1 days).
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
Naperville, IL

Average daylight in May / Average sunshine in May - Naperville, IL
  • Average daylight in May: 14.6h

The month with the longest days is June (Average daylight: 15.2h).
The month with the shortest days is December (Average daylight: 9.2h).

  • Average sunshine in May: 8.6h

Months with the most sunshine are July and August (Average sunshine: 10h).
The month with the least sunshine is January (Average sunshine: 3.8h).

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Average sunshine days in May
Naperville, IL

Average sunshine days in May - Naperville, IL
  • Average sunshine days in May: 12.9 days

The month with the most sunshine days is November (19.6 days).
The month with the least sunshine days is July (10.2 days).

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Average UV index in May
Naperville, IL

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

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

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Average cloud cover in May
Naperville, IL

Average cloud cover in May - Naperville, IL
  • Average cloud cover in May: 42

The month with the most cloud cover is January (Cloud cover 60).
Months with the least cloud cover are August and September (Cloud cover 31).

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Average visibility in May
Naperville, IL

Average visibility in May - Naperville, 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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