August Weather in Sumner, United States

Last updated: June 24, 2025

In Sumner, United States, the average temperature in August is a pleasant 21°C (71°F). You can expect a minimum temperature of 10°C (50°F) and a maximum of 34°C (93°F). During this month, precipitation amounts to 102 mm (4.0 in) over 8 days, contributing to an average humidity of 69%.

August Temperature in Sumner

In August in Sumner, the average temperature is 21°C (71°F). The maximum can reach 34°C (93°F), while the minimum can drop as low as 10°C (50°F). It’s a great time to visit if you enjoy warm weather with some cooler evenings!

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

The chart illustrates August temperature patterns in Sumner, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Sumner, August typically has an average temperature of 21°C (71°F), with highs reaching up to 34°C (93°F) and lows dropping to around 10°C (50°F).

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

August Precipitation in Sumner

In Sumner in August, the precipitation amount is 102 mm (4.0 in) over the course of 8 days.

August Precipitation Trends in Sumner

The chart displays monthly precipitation patterns in Sumner, 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 Sumner, August typically receives around 102 mm (4.0 inches) of precipitation spread over approximately 8 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 Sumner

In Sumner in August humidity is 69%. With an average temperature of 21°C (71°F), this humidity feels like a warm embrace, creating a tropical atmosphere that can make outdoor activities feel slightly sticky, yet invigorating for travelers who are ready to embrace the local culture and explore.

August Average Humidity in Sumner

This chart illustrates the average monthly humidity levels in Sumner, 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 Sumner is approximately 69%, 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 Sumner

In Sumner in August, the maximum UV index is 9, which corresponds to a very high Exposure Category. The time to burn is just 15 minutes, so it's essential to take precautions. For detailed information, you can check the Hourly UV Index in Sumner.

Maximum UV Index Levels in Sumner for August

The chart shows the monthly maximum UV Index (UVI) for Sumner 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 Sumner typically reaches 9, which falls under the very high exposure category.

Data source: Sumner 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 Sumner Compares to Other Months

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

This table compares monthly weather conditions in Sumner, showing how August’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	-7°C (20°F)	40 mm (1.6 inches)	84%	moderate
February Weather	-6°C (21°F)	52 mm (2.0 inches)	85%	moderate
March Weather	2°C (36°F)	68 mm (2.7 inches)	84%	moderate
April Weather	8°C (46°F)	75 mm (3.0 inches)	83%	very high
May Weather	16°C (60°F)	176 mm (6.9 inches)	75%	very high
June Weather	22°C (72°F)	138 mm (5.4 inches)	79%	extreme
July Weather	23°C (75°F)	106 mm (4.2 inches)	75%	very high
August Weather	21°C (71°F)	102 mm (4.0 inches)	69%	very high
September Weather	18°C (66°F)	129 mm (5.1 inches)	74%	very high
October Weather	10°C (51°F)	137 mm (5.4 inches)	79%	moderate
November Weather	2°C (36°F)	49 mm (1.9 inches)	88%	moderate
December Weather	-2°C (29°F)	36 mm (1.4 inches)	82%	moderate