August Weather in Washington, United States

Last updated: June 24, 2025

In August, the average temperature in Washington, United States hovers around 24°C (76°F), offering a pleasant climate for both locals and visitors. However, be prepared for a range of temperatures, as the minimum can dip to 13°C (56°F) while the maximum can soar up to 36°C (96°F). With approximately 145 mm (5.7 in) of precipitation spread over 13 days, and an average humidity level of 80%, it's essential to stay hydrated and pack an umbrella for those occasional showers!

August Temperature in Washington

In August in Washington, the average temperature is 24°C (76°F), with maximums reaching up to 36°C (96°F) and minimums dipping as low as 13°C (56°F). This makes it an ideal time for travelers looking to enjoy warm days and cool evenings.

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

The chart illustrates August temperature patterns in Washington, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Washington, August typically has an average temperature of 24°C (76°F), with highs reaching up to 36°C (96°F) and lows dropping to around 13°C (56°F).

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

August Precipitation in Washington

In Washington in August, the precipitation amount is 145 mm (5.7 in) over the course of 13 days.

August Precipitation Trends in Washington

The chart displays monthly precipitation patterns in Washington, 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 Washington, August typically receives around 145 mm (5.7 inches) of precipitation spread over approximately 13 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 Washington

In Washington in August humidity is 80%. With an average temperature of 24°C (76°F), this humidity feels like a warm, sticky embrace that can make exploring outdoors quite draining, so it's essential to stay hydrated and take breaks in the shade while traveling.

August Average Humidity in Washington

This chart illustrates the average monthly humidity levels in Washington, 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 Washington is approximately 80%, 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 Washington

In Washington 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 Washington.

Maximum UV Index Levels in Washington for August

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

Data source: Washington 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 Washington Compares to Other Months

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

This table compares monthly weather conditions in Washington, showing how August’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	0°C (33°F)	75 mm (2.9 inches)	82%	moderate
February Weather	2°C (36°F)	80 mm (3.1 inches)	80%	moderate
March Weather	8°C (47°F)	126 mm (5.0 inches)	80%	high
April Weather	13°C (55°F)	126 mm (5.0 inches)	80%	very high
May Weather	19°C (66°F)	152 mm (6.0 inches)	82%	very high
June Weather	24°C (76°F)	89 mm (3.5 inches)	83%	extreme
July Weather	26°C (79°F)	100 mm (3.9 inches)	81%	extreme
August Weather	24°C (76°F)	145 mm (5.7 inches)	80%	very high
September Weather	22°C (72°F)	55 mm (2.2 inches)	76%	very high
October Weather	15°C (59°F)	108 mm (4.2 inches)	76%	high
November Weather	7°C (45°F)	69 mm (2.7 inches)	85%	moderate
December Weather	4°C (39°F)	54 mm (2.1 inches)	86%	moderate