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August Weather in Decatur, United States

Last updated: June 24, 2025

In Decatur, United States, the average temperature in August hovers around 27°C (81°F). You can expect a minimum of 18°C (64°F) and a maximum of 37°C (99°F) during this period. Rainfall totals are around 127 mm (5.0 in) spread over 14 days, contributing to an average humidity level of 77%. Prepare for a warm and humid month!

August Temperature in Decatur

In August in Decatur, the average temperature is 27°C (81°F). Maximum temperatures can reach up to 37°C (99°F), while minimums can dip as low as 18°C (64°F). It’s an ideal time for travelers to enjoy warm weather and outdoor activities in Decatur.

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

The chart illustrates August 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, August typically has an average temperature of 27°C (81°F), with highs reaching up to 37°C (99°F) and lows dropping to around 18°C (64°F).
JanFebMarAprMayJunJulAugSepOctNovDec485460647379818178695551
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.

August Precipitation in Decatur

In Decatur in August, the total precipitation amount is 127 mm (5.0 in), occurring over the course of 14 days.

August Precipitation Trends in Decatur

The chart displays monthly precipitation patterns in Decatur, with values for each month alongside August’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how August’s conditions compare to those of other months. In Decatur, August typically receives around 127 mm (5.0 inches) of precipitation spread over approximately 14 days.
JanFebMarAprMayJunJulAugSepOctNovDec1051561161361221631211279610070121
Data source: Precipitation data for August generated using information from the Copernicus Climate Change Service.
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August Humidity in Decatur

In Decatur in August, humidity is 77%. With an average temperature of 27°C (81°F), this humidity feels like a warm blanket, making travel feel sticky and heavy, as sweat clings to the skin and the air becomes thick, causing you to long for refreshing breezes and cool shade.

August Average Humidity in Decatur

This chart illustrates the average monthly humidity levels in Decatur, with August’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In August, average humidity in Decatur is approximately 77%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec85%84%82%82%82%79%82%77%74%73%85%88%
Data source: Humidity data for August generated using information from the Copernicus Climate Change Service.

August UV Index in Decatur

In Decatur in August, 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 August

The chart shows the monthly maximum UV Index (UVI) for Decatur in August, 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 August, the maximum UV index in Decatur typically reaches 11, which falls under the extreme exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec478111111111110864
Data source: Decatur August 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 August 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 August’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 August’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather9°C (48°F)105 mm (4.1 inches)85%moderate
February Weather12°C (54°F)156 mm (6.1 inches)84%high
March Weather16°C (60°F)116 mm (4.6 inches)82%very high
April Weather18°C (65°F)136 mm (5.4 inches)82%extreme
May Weather23°C (74°F)122 mm (4.8 inches)82%extreme
June Weather26°C (79°F)163 mm (6.4 inches)79%extreme
July Weather27°C (81°F)121 mm (4.8 inches)82%extreme
August Weather27°C (81°F)127 mm (5.0 inches)77%extreme
September Weather25°C (78°F)95 mm (3.8 inches)74%very high
October Weather20°C (69°F)100 mm (3.9 inches)73%very high
November Weather13°C (55°F)70 mm (2.7 inches)85%high
December Weather11°C (52°F)121 mm (4.8 inches)88%moderate

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