August Weather in Sumter, United States

Last updated: June 24, 2025

In Sumter, United States, the average temperature in August reaches a warm 27°C (81°F). However, be prepared for a range, with minimums dropping to 17°C (62°F) and maximums soaring to 37°C (99°F). Expect 128 mm (5.0 in) of precipitation spread across 16 days, contributing to an average humidity of 81%. Don't forget your umbrella and stay hydrated!

August Temperature in Sumter

In August in Sumter, the average temperature is 27°C (81°F), with a maximum that can reach 37°C (99°F) and a minimum that can drop to 17°C (62°F). This makes it an ideal time for travelers looking to enjoy warm weather while still having the option for cooler evenings.

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

The chart illustrates August temperature patterns in Sumter, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Sumter, 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 17°C (62°F).

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

August Precipitation in Sumter

In Sumter in August, the precipitation amount is 128 mm (5.0 in) spread over 16 days.

August Precipitation Trends in Sumter

The chart displays monthly precipitation patterns in Sumter, 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 Sumter, August typically receives around 128 mm (5.0 inches) of precipitation spread over approximately 16 days.

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

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Millimeters (mm) Inches (in)

August Humidity in Sumter

In Sumter in August humidity is 81%. With an average temperature of 27°C (81°F), this humidity feels like a warm, heavy blanket enveloping you, making travel quite uncomfortable as it can quickly drain your energy and require frequent hydration breaks.

August Average Humidity in Sumter

This chart illustrates the average monthly humidity levels in Sumter, 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 Sumter is approximately 81%, offering insight into how humid the weather typically is during this month.

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

August UV Index in Sumter

In Sumter in August, 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 Sumter.

Maximum UV Index Levels in Sumter for August

The chart shows the monthly maximum UV Index (UVI) for Sumter 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 Sumter typically reaches 10, which falls under the very high exposure category.

Data source: Sumter 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 Sumter Compares to Other Months

Weather in Sumter varies notably across the year, with each month offering distinct climate conditions. This page compares August’s weather to other months in Sumter, focusing on differences in temperature, rainfall, humidity, and UV levels.

This table compares monthly weather conditions in Sumter, showing how August’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	9°C (48°F)	78 mm (3.1 inches)	86%	moderate
February Weather	12°C (54°F)	95 mm (3.7 inches)	81%	high
March Weather	14°C (58°F)	70 mm (2.8 inches)	81%	very high
April Weather	18°C (65°F)	102 mm (4.0 inches)	79%	very high
May Weather	23°C (74°F)	97 mm (3.8 inches)	75%	extreme
June Weather	26°C (79°F)	122 mm (4.8 inches)	75%	extreme
July Weather	28°C (82°F)	144 mm (5.7 inches)	80%	extreme
August Weather	27°C (81°F)	128 mm (5.0 inches)	81%	very high
September Weather	25°C (78°F)	136 mm (5.4 inches)	83%	very high
October Weather	21°C (69°F)	56 mm (2.2 inches)	78%	very high
November Weather	13°C (55°F)	67 mm (2.6 inches)	85%	high
December Weather	10°C (51°F)	141 mm (5.5 inches)	87%	moderate