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May Weather in Decatur, United States

Last updated: June 24, 2025

In Decatur, United States, the average temperature in May reaches a comfortable 19°C (66°F). However, temperatures can range from a chilly 0°C (33°F) to a sweltering 34°C (93°F). Expect 149 mm (5.9 in) of precipitation over 14 days, contributing to the region's average humidity of 80%.

May Temperature in Decatur

In May in Decatur, the average temperature is 19°C (66°F). Maximums can reach 34°C (93°F), and minimums can be as low as 0°C (33°F). This variation in temperatures makes Decatur an ideal destination for travelers seeking both warmth and the possibility of cooler evenings, so be sure to pack accordingly.

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 19°C (66°F), with highs reaching up to 34°C (93°F) and lows dropping to around 0°C (33°F).
JanFebMarAprMayJunJulAugSepOctNovDec293243526575777470574236
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 precipitation amount is 149 mm (5.9 in) over a span of 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 149 mm (5.9 inches) of precipitation spread over approximately 14 days.
JanFebMarAprMayJunJulAugSepOctNovDec7676131132149112114101711207653
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 80%. With an average temperature of 19°C (66°F), this humidity feels like a warm, thick blanket wrapping around you, making outdoor activities feel more strenuous and sticky, which can ultimately dampen the experience of traveling.

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 80%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec84%82%84%83%80%83%82%83%79%79%88%87%
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 reaches 10, which corresponds to a very high Exposure Category. With a time to burn of just 15 minutes, it's crucial to take precautions. For more 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 10, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec356910111198643
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-2°C (29°F)76 mm (3.0 inches)84%moderate
February Weather0°C (32°F)76 mm (3.0 inches)82%moderate
March Weather6°C (44°F)131 mm (5.2 inches)84%high
April Weather11°C (53°F)132 mm (5.2 inches)83%very high
May Weather19°C (66°F)149 mm (5.9 inches)80%very high
June Weather24°C (75°F)112 mm (4.4 inches)83%extreme
July Weather25°C (78°F)114 mm (4.5 inches)82%extreme
August Weather23°C (74°F)101 mm (4.0 inches)82%very high
September Weather21°C (71°F)71 mm (2.8 inches)79%very high
October Weather14°C (58°F)120 mm (4.7 inches)79%high
November Weather5°C (42°F)76 mm (3.0 inches)88%moderate
December Weather2°C (36°F)53 mm (2.1 inches)87%moderate

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