July Weather in Decatur, United States

Last updated: June 24, 2025

In Decatur, United States, the average temperature in July hovers around a warm 29°C (85°F). Expect the mercury to dip as low as 18°C (64°F) and soar up to a sizzling 42°C (109°F). During this month, precipitation measures around 44 mm (1.7 in), typically spread over 8 days, while the average humidity sits at a muggy 75%.

July Temperature in Decatur

In July in Decatur, the average temperature is 29°C (85°F). Maximum temperatures can reach as high as 42°C (109°F), while minimum temperatures can drop to around 18°C (64°F). Travelers should be prepared for both heat and cooler evenings during this time.

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

The chart illustrates July 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, July typically has an average temperature of 29°C (85°F), with highs reaching up to 42°C (109°F) and lows dropping to around 18°C (64°F).

Data source: Temperature data for Decatur generated using information from the Copernicus Climate Change Service.

July Precipitation in Decatur

In Decatur in July, the total precipitation amount is 44 mm (1.7 in) over a duration of 8 days.

July Precipitation Trends in Decatur

The chart displays monthly precipitation patterns in Decatur, with values for each month alongside July’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how July’s conditions compare to those of other months. In Decatur, July typically receives around 44 mm (1.7 inches) of precipitation spread over approximately 8 days.

Data source: Precipitation data for July generated using information from the Copernicus Climate Change Service.

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Millimeters (mm) Inches (in)

July Humidity in Decatur

In Decatur in July, humidity is 75%. With an average temperature of 29°C (85°F), this humidity feels like a thick blanket wrapping around you, making outdoor activities feel heavy and exhausting for traveling.

July Average Humidity in Decatur

This chart illustrates the average monthly humidity levels in Decatur, with July’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In July, average humidity in Decatur is approximately 75%, offering insight into how humid the weather typically is during this month.

Data source: Humidity data for July generated using information from the Copernicus Climate Change Service.

July UV Index in Decatur

In Decatur in July, 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 July

The chart shows the monthly maximum UV Index (UVI) for Decatur in July, 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 July, the maximum UV index in Decatur typically reaches 11, which falls under the extreme exposure category.

Data source: Decatur July 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 July 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 July’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 July’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	7°C (45°F)	51 mm (2.0 inches)	77%	moderate
February Weather	9°C (48°F)	78 mm (3.1 inches)	76%	high
March Weather	15°C (59°F)	85 mm (3.3 inches)	74%	very high
April Weather	18°C (64°F)	91 mm (3.6 inches)	75%	very high
May Weather	23°C (74°F)	135 mm (5.3 inches)	80%	extreme
June Weather	27°C (81°F)	86 mm (3.4 inches)	80%	extreme
July Weather	29°C (85°F)	44 mm (1.7 inches)	75%	extreme
August Weather	29°C (84°F)	82 mm (3.2 inches)	67%	extreme
September Weather	26°C (78°F)	81 mm (3.2 inches)	64%	very high
October Weather	19°C (67°F)	121 mm (4.8 inches)	70%	very high
November Weather	13°C (55°F)	50 mm (2.0 inches)	82%	high
December Weather	10°C (50°F)	49 mm (1.9 inches)	85%	moderate