nomadseason

May Weather in Decatur, United States

Last updated: June 24, 2025

In Decatur, United States, the average temperature in May hovers around 21°C (71°F). Expect a minimum dip to 4°C (39°F) and a possible peak of 34°C (93°F). Rainfall averages 120 mm (4.7 in) over about 11 days, contributing to an average humidity of 85%. Prepare for a warm, wet adventure!

May Temperature in Decatur

In May in Decatur, the average temperature is 21°C (71°F), with maximums reaching up to 34°C (93°F) and minimums dropping as low as 4°C (39°F). It's a great time for travelers to experience a pleasant blend of warmth and cooler evenings in Decatur.

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 21°C (71°F), with highs reaching up to 34°C (93°F) and lows dropping to around 4°C (39°F).
JanFebMarAprMayJunJulAugSepOctNovDec434854607076807875655046
Data source: Temperature data for Decatur generated using information from the Copernicus Climate Change Service.
Choose your preferred temperature unit
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 120 mm (4.7 in) during a span of 11 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 120 mm (4.7 inches) of precipitation spread over approximately 11 days.
JanFebMarAprMayJunJulAugSepOctNovDec981731621521201041081149312478133
Data source: Precipitation data for May generated using information from the Copernicus Climate Change Service.
Choose your preferred precipitation unit

May Humidity in Decatur

In Decatur in May humidity is 85%. With an average temperature of 21°C (71°F), this humidity feels like a warm, heavy blanket enveloping you, making travel a bit more tiring but also creating an atmosphere rich with the scent of blooming flora and vibrant street life.

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 85%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec86%86%86%82%85%85%83%76%76%80%88%88%
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 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 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 11, which falls under the extreme exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec36810111111109753
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 Weather6°C (43°F)98 mm (3.8 inches)86%moderate
February Weather9°C (48°F)173 mm (6.8 inches)86%high
March Weather12°C (54°F)162 mm (6.4 inches)86%very high
April Weather16°C (61°F)152 mm (6.0 inches)82%very high
May Weather21°C (71°F)120 mm (4.7 inches)85%extreme
June Weather24°C (76°F)104 mm (4.1 inches)85%extreme
July Weather27°C (80°F)108 mm (4.2 inches)83%extreme
August Weather26°C (79°F)114 mm (4.5 inches)76%very high
September Weather24°C (75°F)93 mm (3.7 inches)76%very high
October Weather18°C (65°F)124 mm (4.9 inches)80%high
November Weather10°C (51°F)78 mm (3.1 inches)88%moderate
December Weather8°C (47°F)133 mm (5.2 inches)88%moderate

Compare Decatur's Climate with Cities Worldwide