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May Weather in Decatur, United States

Last updated: June 24, 2025

In Decatur, United States, the average temperature in May hovers around 16°C (60°F). However, be prepared for a temperature range that can dip as low as -1°C (31°F) and soar to a balmy 34°C (94°F). Expect about 136 mm (5.3 in) of precipitation over 14 days, accompanied by an average humidity of 78%—perfect for those who appreciate a touch of moisture in the air!

May Temperature in Decatur

In May in Decatur, the average temperature is 16°C (60°F). Maximums can reach 34°C (94°F), while minimums can drop as low as -1°C (31°F). This wide range of temperatures makes Decatur an interesting destination to explore, so be sure to pack accordingly to enjoy all its offerings comfortably.

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

The chart illustrates May temperature patterns in Decatur, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Decatur, May typically has an average temperature of 16°C (60°F), with highs reaching up to 34°C (94°F) and lows dropping to around -1°C (31°F).
JanFebMarAprMayJunJulAugSepOctNovDec222337476071757266523730
Data source: Temperature data for Decatur 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 Decatur

In Decatur in May, the total precipitation amount is 136 mm (5.3 in) spread over 14 days.

May Precipitation Trends in Decatur

The chart displays monthly precipitation patterns in Decatur, 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 Decatur, May typically receives around 136 mm (5.3 inches) of precipitation spread over approximately 14 days.
JanFebMarAprMayJunJulAugSepOctNovDec55545997136124781061181134349
Data source: Precipitation data for May generated using information from the Copernicus Climate Change Service.
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May Humidity in Decatur

In Decatur in May humidity is 78%. With an average temperature of 16°C (60°F), this humidity feels like a damp embrace, making travel a bit uncomfortable as the air clings to your skin and leaves you feeling sticky.

May Average Humidity in Decatur

This chart illustrates the average monthly humidity levels in Decatur, 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 Decatur is approximately 78%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec85%85%85%85%78%80%78%76%79%83%88%82%
Data source: Humidity data for May generated using information from the Copernicus Climate Change Service.

May UV Index in Decatur

In Decatur 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 Decatur.

Maximum UV Index Levels in Decatur for May

The chart shows the monthly maximum UV Index (UVI) for Decatur 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 Decatur typically reaches 9, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec34689101098532
Data source: Decatur 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 Decatur Compares to Other Months

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

This table compares monthly weather conditions in Decatur, showing how May’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-6°C (22°F)55 mm (2.2 inches)85%moderate
February Weather-5°C (24°F)54 mm (2.1 inches)85%moderate
March Weather3°C (37°F)59 mm (2.3 inches)85%high
April Weather8°C (47°F)97 mm (3.8 inches)85%very high
May Weather16°C (60°F)136 mm (5.3 inches)78%very high
June Weather22°C (71°F)124 mm (4.9 inches)80%very high
July Weather24°C (75°F)78 mm (3.1 inches)78%very high
August Weather22°C (72°F)106 mm (4.2 inches)76%very high
September Weather19°C (66°F)118 mm (4.6 inches)79%very high
October Weather11°C (52°F)113 mm (4.5 inches)83%moderate
November Weather3°C (37°F)43 mm (1.7 inches)88%moderate
December Weather-1°C (30°F)49 mm (1.9 inches)81%low

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