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August Weather in Decatur, United States

Last updated: June 24, 2025

In Decatur, United States, the average temperature in August typically reaches 29°C (84°F), with variations from a comfortable minimum of 19°C (66°F) to a sweltering maximum of 40°C (105°F). Expect about 82 mm (3.2 in) of precipitation spread over 8 days, contributing to an average humidity level of 67%. Stay prepared for the heat and humidity!

August Temperature in Decatur

In August in Decatur, the average temperature is 29°C (84°F), with maximums reaching 40°C (105°F) and minimums as low as 19°C (66°F). This warm climate makes it a great destination for travelers seeking sunny weather and outdoor activities.

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 29°C (84°F), with highs reaching up to 40°C (105°F) and lows dropping to around 19°C (66°F).
JanFebMarAprMayJunJulAugSepOctNovDec454859647481858478665550
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 reached 82 mm (3.2 in) over the course of 8 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 82 mm (3.2 inches) of precipitation spread over approximately 8 days.
JanFebMarAprMayJunJulAugSepOctNovDec51788591135864482811215049
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 67%. With an average temperature of 29°C (84°F), this humidity feels like walking through a warm, damp blanket that clings to your skin, making outdoor activities a bit more strenuous and necessitating plenty of water breaks for a comfortable travel experience.

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 67%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec77%76%74%75%80%80%75%67%64%70%82%85%
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.
JanFebMarAprMayJunJulAugSepOctNovDec468101111111110864
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 Weather7°C (45°F)51 mm (2.0 inches)77%moderate
February Weather9°C (48°F)78 mm (3.1 inches)76%high
March Weather15°C (59°F)85 mm (3.3 inches)74%very high
April Weather18°C (64°F)91 mm (3.6 inches)75%very high
May Weather23°C (74°F)135 mm (5.3 inches)80%extreme
June Weather27°C (81°F)86 mm (3.4 inches)80%extreme
July Weather29°C (85°F)44 mm (1.7 inches)75%extreme
August Weather29°C (84°F)82 mm (3.2 inches)67%extreme
September Weather26°C (78°F)81 mm (3.2 inches)64%very high
October Weather19°C (67°F)121 mm (4.8 inches)70%very high
November Weather13°C (55°F)50 mm (2.0 inches)82%high
December Weather10°C (50°F)49 mm (1.9 inches)85%moderate

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