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May Weather in Knoxville, United States

Last updated: June 24, 2025

In Knoxville, United States, the average temperature in May hovers around 20°C (69°F). However, be prepared for a wide range, with minimums dipping to 5°C (41°F) and maximums soaring to 33°C (92°F). Throughout the month, precipitation averages 213 mm (8.4 in) over 15 days, adding to the high humidity level of approximately 82%.

May Temperature in Knoxville

In May in Knoxville, the average temperature is 20°C (69°F), with maximums reaching 33°C (92°F) and minimums dropping to as low as 5°C (41°F). This makes it an ideal time for travelers to experience a pleasant mix of warm days and cooler evenings.

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

The chart illustrates May temperature patterns in Knoxville, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Knoxville, May typically has an average temperature of 20°C (69°F), with highs reaching up to 33°C (92°F) and lows dropping to around 5°C (41°F).
JanFebMarAprMayJunJulAugSepOctNovDec394353586876807874624945
Data source: Temperature data for Knoxville 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 Knoxville

In Knoxville in May, the total precipitation amount is 213 mm (8.4 in), falling over a span of 15 days.

May Precipitation Trends in Knoxville

The chart displays monthly precipitation patterns in Knoxville, 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 Knoxville, May typically receives around 213 mm (8.4 inches) of precipitation spread over approximately 15 days.
JanFebMarAprMayJunJulAugSepOctNovDec101142156154213114771167210796110
Data source: Precipitation data for May generated using information from the Copernicus Climate Change Service.
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May Humidity in Knoxville

In Knoxville in May humidity is 82%. With an average temperature of 20°C (69°F), this humidity feels like a warm, sticky embrace that clings to your skin, making it necessary to stay hydrated while exploring the sights.

May Average Humidity in Knoxville

This chart illustrates the average monthly humidity levels in Knoxville, 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 Knoxville is approximately 82%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec82%79%77%78%82%81%75%61%59%69%82%88%
Data source: Humidity data for May generated using information from the Copernicus Climate Change Service.

May UV Index in Knoxville

In Knoxville in May, the maximum UV index reaches 11, which corresponds to an extreme Exposure Category. With a time to burn of just 10 minutes, it's essential to take precautions. For more details, you can check the Hourly UV Index in Knoxville.

Maximum UV Index Levels in Knoxville for May

The chart shows the monthly maximum UV Index (UVI) for Knoxville 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 Knoxville typically reaches 11, which falls under the extreme exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec46810111111109754
Data source: Knoxville 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 Knoxville Compares to Other Months

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

This table compares monthly weather conditions in Knoxville, showing how May’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather4°C (40°F)101 mm (4.0 inches)82%moderate
February Weather6°C (43°F)142 mm (5.6 inches)79%high
March Weather11°C (53°F)156 mm (6.1 inches)77%very high
April Weather15°C (59°F)154 mm (6.1 inches)78%very high
May Weather20°C (69°F)213 mm (8.4 inches)82%extreme
June Weather25°C (77°F)114 mm (4.5 inches)81%extreme
July Weather27°C (80°F)77 mm (3.0 inches)75%extreme
August Weather26°C (78°F)116 mm (4.6 inches)61%very high
September Weather24°C (75°F)72 mm (2.8 inches)59%very high
October Weather17°C (62°F)107 mm (4.2 inches)69%high
November Weather9°C (49°F)96 mm (3.8 inches)82%moderate
December Weather7°C (45°F)110 mm (4.3 inches)87%moderate

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