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May Weather in Naperville, United States

Last updated: June 24, 2025

In Naperville, United States, the average temperature in May hovers around 16°C (61°F). However, be prepared for a temperature range that can swing from a chilly -2°C (29°F) to a warm 34°C (93°F). During this month, you can expect an average precipitation of 157 mm (6.2 in) spread across 15 days, coupled with an average humidity of 79%. Whether you're planning outdoor adventures or cozy indoors, the weather in Naperville has something for everyone!

May Temperature in Naperville

In May in Naperville, the average temperature is 16°C (61°F). Maximums can reach 34°C (93°F), while minimums can dip as low as -2°C (29°F). Be prepared for a wide range of temperatures during your travels, so pack accordingly!

May Weather in Naperville: Daily Temperature Highs, Lows, and Averages

The chart illustrates May temperature patterns in Naperville, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Naperville, May typically has an average temperature of 16°C (61°F), with highs reaching up to 34°C (93°F) and lows dropping to around -2°C (29°F).
JanFebMarAprMayJunJulAugSepOctNovDec252739486172757367543933
Data source: Temperature data for Naperville generated using information from the Copernicus Climate Change Service.
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The average of daily temperatures (24 hours) calculated across all days in the month.

May Precipitation in Naperville

In Naperville in May, the precipitation amount is 157 mm (6.2 in) over a period of 15 days.

May Precipitation Trends in Naperville

The chart displays monthly precipitation patterns in Naperville, with values for each month alongside May’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how May’s conditions compare to those of other months. In Naperville, May typically receives around 157 mm (6.2 inches) of precipitation spread over approximately 15 days.
JanFebMarAprMayJunJulAugSepOctNovDec63638711715715211991951295753
Data source: Precipitation data for May generated using information from the Copernicus Climate Change Service.
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May Humidity in Naperville

In Naperville in May humidity is 79%. With an average temperature of 16°C (61°F), this humidity feels like a warm, moist embrace, making travel a bit more challenging as the air tends to weigh heavily, but it also offers a refreshing atmosphere perfect for exploring local sights and enjoying nature.

May Average Humidity in Naperville

This chart illustrates the average monthly humidity levels in Naperville, with May’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In May, average humidity in Naperville is approximately 79%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec82%83%84%85%79%82%80%81%80%82%88%84%
Data source: Humidity data for May generated using information from the Copernicus Climate Change Service.

May UV Index in Naperville

In Naperville in May, the maximum UV index is 9, which corresponds to a very high Exposure Category. The time to burn is just 15 minutes, so it's essential to take precautions. For detailed information, you can check the Hourly UV Index in Naperville.

Maximum UV Index Levels in Naperville for May

The chart shows the monthly maximum UV Index (UVI) for Naperville in May, representing the highest UV radiation level. The UVI measures the intensity of ultraviolet radiation from the sun, indicating the potential risk of sunburn and UV-related health issues. In May, the maximum UV index in Naperville typically reaches 9, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec34689101098642
Data source: Naperville May UVI data generated using information from the Copernicus Climate Change Service.

UV Risk Categories

  •  Extreme (11+): Avoid the sun, stay in shade.
  •  Very High (8-10): Limit sun exposure.
  •  High (6-7): Use SPF 30+ and protective clothing.
  •  Moderate (3-5): Midday shade recommended.
  •  Low (0-2): No protection needed.

How May Weather in Naperville Compares to Other Months

Weather in Naperville varies notably across the year, with each month offering distinct climate conditions. This page compares May’s weather to other months in Naperville, focusing on differences in temperature, rainfall, humidity, and UV levels.

This table compares monthly weather conditions in Naperville, showing how May’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-4°C (26°F)62 mm (2.5 inches)82%moderate
February Weather-3°C (28°F)63 mm (2.5 inches)83%moderate
March Weather4°C (40°F)87 mm (3.4 inches)84%high
April Weather9°C (49°F)117 mm (4.6 inches)85%very high
May Weather16°C (61°F)157 mm (6.2 inches)79%very high
June Weather22°C (72°F)152 mm (6.0 inches)82%very high
July Weather24°C (76°F)119 mm (4.7 inches)80%very high
August Weather23°C (73°F)91 mm (3.6 inches)81%very high
September Weather20°C (68°F)95 mm (3.8 inches)80%very high
October Weather12°C (54°F)129 mm (5.1 inches)82%high
November Weather4°C (39°F)57 mm (2.3 inches)88%moderate
December Weather0°C (33°F)53 mm (2.1 inches)84%low

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