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August Weather in Washington, United States

Last updated: June 24, 2025

In Washington, United States, the average temperature in August hovers around 20°C (68°F), with daily variations ranging from a minimum of 14°C (57°F) to a maximum of 26°C (78°F). Be prepared for some rain, as 87 mm (3.4 in) of precipitation can be expected over 9 days. With an average humidity of 76%, the air can feel quite moist, enhancing the overall climate experience.

August Temperature in Washington

In August in Washington, the average temperature is 20°C (68°F). Maximums can reach 26°C (78°F), while minimums can drop to as low as 14°C (57°F). Overall, this climate provides a comfortable and pleasant environment for travelers.

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 20°C (68°F), with highs reaching up to 26°C (78°F) and lows dropping to around 14°C (57°F).
JanFebMarAprMayJunJulAugSepOctNovDec242329364557686862513830
Data source: Temperature data for Washington generated using information from the Copernicus Climate Change Service.
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The average of daily temperatures (24 hours) calculated across all days in the month.

August Precipitation in Washington

In Washington in August, the precipitation amount is 87 mm (3.4 in), occurring over a span of 9 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 87 mm (3.4 inches) of precipitation spread over approximately 9 days.
JanFebMarAprMayJunJulAugSepOctNovDec4456619083907687851146770
Data source: Precipitation data for August generated using information from the Copernicus Climate Change Service.
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August Humidity in Washington

In Washington in August, humidity is 76%. With an average temperature of 20°C (68°F), this humidity feels like a warm blanket wrapping around you, making outdoor exploration both exhilarating and slightly stifling, ideal for leisurely strolls but necessitating frequent breaks to hydrate and cool off.

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 76%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec91%91%87%87%82%79%76%76%79%83%86%87%
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 is 8, which corresponds to a very high Exposure Category. This means that the time to burn is only 15 minutes. For more detailed information, you can refer to 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 8, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec245799987532
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.
 TemperaturePrecipitationHumidityUV
January Weather-5°C (24°F)44 mm (1.7 inches)91%low
February Weather-5°C (23°F)56 mm (2.2 inches)91%moderate
March Weather-1°C (30°F)61 mm (2.4 inches)87%moderate
April Weather2°C (36°F)90 mm (3.5 inches)87%high
May Weather7°C (45°F)83 mm (3.3 inches)82%very high
June Weather14°C (57°F)90 mm (3.5 inches)79%very high
July Weather20°C (68°F)76 mm (3.0 inches)75%very high
August Weather20°C (68°F)87 mm (3.4 inches)76%very high
September Weather17°C (62°F)85 mm (3.4 inches)79%high
October Weather11°C (51°F)114 mm (4.5 inches)83%moderate
November Weather3°C (38°F)67 mm (2.6 inches)86%moderate
December Weather-1°C (30°F)70 mm (2.8 inches)87%low

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