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May Weather in Wheaton, United States

Last updated: June 24, 2025

In May, the average temperature in Wheaton, United States hovers around 14°C (58°F). Expect a range where the minimum can drop to -2°C (29°F) and the maximum can soar to 35°C (95°F). During this month, precipitation averages 80 mm (3.2 in) over approximately 10 days, accompanied by a humidity level of 76%. So, be prepared for a mix of weather!

May Temperature in Wheaton

In May in Wheaton, the average temperature is 14°C (58°F), with maximums reaching 35°C (95°F) and minimums dropping as low as -2°C (29°F). This wide temperature range makes Wheaton a destination where travelers should pack accordingly to enjoy both warm and chilly moments.

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

The chart illustrates May temperature patterns in Wheaton, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Wheaton, May typically has an average temperature of 14°C (58°F), with highs reaching up to 35°C (95°F) and lows dropping to around -2°C (29°F).
JanFebMarAprMayJunJulAugSepOctNovDec141430415871747063463222
Data source: Temperature data for Wheaton 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 Wheaton

In Wheaton in May, the precipitation amount is 80 mm (3.2 in) over a span of 10 days.

May Precipitation Trends in Wheaton

The chart displays monthly precipitation patterns in Wheaton, 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 Wheaton, May typically receives around 80 mm (3.2 inches) of precipitation spread over approximately 10 days.
JanFebMarAprMayJunJulAugSepOctNovDec1918375880798712178792336
Data source: Precipitation data for May generated using information from the Copernicus Climate Change Service.
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May Humidity in Wheaton

In Wheaton in May humidity is 76%. With an average temperature of 14°C (58°F), this humidity feels like a warm, thick blanket wrapping around you, making outdoor activities feel sticky and draining, and prompting travelers to seek shade and stay hydrated often.

May Average Humidity in Wheaton

This chart illustrates the average monthly humidity levels in Wheaton, 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 Wheaton is approximately 76%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec85%89%81%82%76%81%82%83%82%82%87%84%
Data source: Humidity data for May generated using information from the Copernicus Climate Change Service.

May UV Index in Wheaton

In Wheaton 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 Wheaton.

Maximum UV Index Levels in Wheaton for May

The chart shows the monthly maximum UV Index (UVI) for Wheaton 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 Wheaton typically reaches 9, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec3567910997532
Data source: Wheaton 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 Wheaton Compares to Other Months

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

This table compares monthly weather conditions in Wheaton, showing how May’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-10°C (14°F)19 mm (0.7 inches)85%moderate
February Weather-10°C (14°F)18 mm (0.7 inches)89%moderate
March Weather-1°C (31°F)37 mm (1.5 inches)81%high
April Weather5°C (41°F)57 mm (2.3 inches)82%high
May Weather14°C (58°F)80 mm (3.2 inches)76%very high
June Weather22°C (71°F)79 mm (3.1 inches)81%very high
July Weather23°C (74°F)87 mm (3.4 inches)82%very high
August Weather21°C (70°F)120 mm (4.7 inches)83%very high
September Weather17°C (63°F)78 mm (3.1 inches)82%high
October Weather8°C (47°F)79 mm (3.1 inches)82%moderate
November Weather0°C (32°F)23 mm (0.9 inches)87%moderate
December Weather-5°C (22°F)36 mm (1.4 inches)84%low

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