August Weather in Washington, United States

Last updated: June 24, 2025

In August, the average temperature in Washington, United States is a pleasant 24°C (75°F). Visitors can expect a comfortable range, with minimums dipping to 13°C (55°F) and maximums reaching up to 36°C (98°F). This month sees an average precipitation of 132 mm (5.2 in), spread over 13 days, resulting in an average humidity of 59%. Whether you're exploring the sights or relaxing outdoors, be prepared for a mix of warmth and occasional rain!

August Temperature in Washington

In August, in Washington, the average temperature is 24°C (75°F). Maximum temperatures can reach 36°C (98°F), while the minimum can drop to as low as 13°C (55°F). This makes Washington an ideal destination for travelers looking to enjoy warm weather with a comfortable range for outdoor activities.

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 (75°F), with highs reaching up to 36°C (98°F) and lows dropping to around 13°C (55°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 132 mm (5.2 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 132 mm (5.2 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 59%. With an average temperature of 24°C (75°F), this humidity feels like a warm embrace, making outdoor activities refreshing yet slightly sticky, perfect for leisurely strolls but reminding travelers to stay hydrated.

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 59%, 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	1°C (35°F)	59 mm (2.3 inches)	86%	moderate
February Weather	4°C (40°F)	90 mm (3.6 inches)	86%	moderate
March Weather	7°C (45°F)	76 mm (3.0 inches)	86%	high
April Weather	13°C (55°F)	105 mm (4.1 inches)	84%	very high
May Weather	18°C (65°F)	125 mm (4.9 inches)	78%	extreme
June Weather	22°C (73°F)	121 mm (4.8 inches)	79%	very high
July Weather	25°C (78°F)	103 mm (4.1 inches)	70%	very high
August Weather	24°C (75°F)	132 mm (5.2 inches)	59%	very high
September Weather	21°C (69°F)	108 mm (4.3 inches)	68%	very high
October Weather	15°C (60°F)	103 mm (4.1 inches)	80%	high
November Weather	7°C (45°F)	83 mm (3.3 inches)	86%	moderate
December Weather	4°C (39°F)	85 mm (3.4 inches)	85%	moderate