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August Weather in Bellevue, United States

Last updated: June 24, 2025

In Bellevue, United States, the average temperature in August hovers around 19°C (66°F). However, you can expect a range with minimums dipping to 1°C (34°F) and maximums soaring to 34°C (93°F). During this month, precipitation totals about 17 mm (0.7 in) over just 4 days, while the average humidity remains a comfortable 42%.

August Temperature in Bellevue

In August in Bellevue, the average temperature is 19°C (66°F). Maximum temperatures can reach up to 34°C (93°F), while minimums can drop to as low as 1°C (34°F). This variation makes it essential for travelers to pack layers to accommodate both warm days and cooler nights.

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

The chart illustrates August temperature patterns in Bellevue, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Bellevue, August typically has an average temperature of 19°C (66°F), with highs reaching up to 34°C (93°F) and lows dropping to around 1°C (34°F).
JanFebMarAprMayJunJulAugSepOctNovDec192130374758686556413019
Data source: Temperature data for Bellevue 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 Bellevue

In Bellevue in August, the precipitation amount is 17 mm (0.7 in) over a span of 4 days.

August Precipitation Trends in Bellevue

The chart displays monthly precipitation patterns in Bellevue, 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 Bellevue, August typically receives around 17 mm (0.7 inches) of precipitation spread over approximately 4 days.
JanFebMarAprMayJunJulAugSepOctNovDec58804943522551721344345
Data source: Precipitation data for August generated using information from the Copernicus Climate Change Service.
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August Humidity in Bellevue

In Bellevue in August, humidity is 42%. With an average temperature of 19°C (66°F), this humidity feels like a refreshing embrace, making it pleasant for traveling as long as you stay hydrated and enjoy the comfortable warmth while exploring.

August Average Humidity in Bellevue

This chart illustrates the average monthly humidity levels in Bellevue, 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 Bellevue is approximately 42%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec91%92%85%76%66%62%53%42%46%64%83%87%
Data source: Humidity data for August generated using information from the Copernicus Climate Change Service.

August UV Index in Bellevue

In Bellevue 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 Bellevue.

Maximum UV Index Levels in Bellevue for August

The chart shows the monthly maximum UV Index (UVI) for Bellevue 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 Bellevue typically reaches 10, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec3589111211109643
Data source: Bellevue 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 Bellevue Compares to Other Months

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

This table compares monthly weather conditions in Bellevue, showing how August’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-7°C (20°F)58 mm (2.3 inches)91%moderate
February Weather-6°C (22°F)80 mm (3.1 inches)92%moderate
March Weather-1°C (30°F)49 mm (1.9 inches)85%very high
April Weather3°C (38°F)43 mm (1.7 inches)76%very high
May Weather8°C (47°F)52 mm (2.0 inches)66%extreme
June Weather15°C (58°F)25 mm (1.0 inches)62%extreme
July Weather20°C (68°F)5 mm (0.2 inches)53%extreme
August Weather19°C (66°F)17 mm (0.7 inches)42%very high
September Weather13°C (56°F)21 mm (0.8 inches)46%very high
October Weather5°C (41°F)34 mm (1.3 inches)64%high
November Weather-1°C (30°F)43 mm (1.7 inches)83%moderate
December Weather-7°C (20°F)45 mm (1.8 inches)87%moderate

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