August Weather in West Lake Sammamish, United States

Last updated: June 24, 2025

In August, the average temperature in West Lake Sammamish, United States is a pleasant 18°C (65°F). Visitors can expect a comfortable range, with minimum temperatures dipping to 7°C (44°F) and highs reaching up to 35°C (94°F). Rainfall is moderate, with an average precipitation of 23 mm (0.9 in) spread over about 5 days, and relative humidity hovering around 63%. Whether you're exploring the outdoors or enjoying local culture, the weather provides a delightful backdrop for your adventures!

August Temperature in West Lake Sammamish

In August in West Lake Sammamish, the average temperature is 18°C (65°F), with maximums reaching up to 35°C (94°F) and minimums dropping as low as 7°C (44°F). This diverse range of temperatures makes West Lake Sammamish an ideal destination for travelers seeking a mix of warmth and coolness.

August Weather in West Lake Sammamish: Daily Temperature Highs, Lows, and Averages

The chart illustrates August temperature patterns in West Lake Sammamish, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In West Lake Sammamish, August typically has an average temperature of 18°C (65°F), with highs reaching up to 35°C (94°F) and lows dropping to around 7°C (44°F).
JanFebMarAprMayJunJulAugSepOctNovDec403844495560656560504540
Data source: Temperature data for West Lake Sammamish 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 West Lake Sammamish

In West Lake Sammamish in August, the precipitation amount is 23 mm (0.9 in) over the course of 5 days.

August Precipitation Trends in West Lake Sammamish

The chart displays monthly precipitation patterns in West Lake Sammamish, 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 West Lake Sammamish, August typically receives around 23 mm (0.9 inches) of precipitation spread over approximately 5 days.
JanFebMarAprMayJunJulAugSepOctNovDec20023415214485782823115205217235
Data source: Precipitation data for August generated using information from the Copernicus Climate Change Service.
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August Humidity in West Lake Sammamish

In West Lake Sammamish in August, humidity is 63%. With an average temperature of 18°C (65°F), this humidity feels like a comfortable embrace, making for an enjoyable travel experience that allows for leisurely exploration without feeling overly sticky or oppressive.

August Average Humidity in West Lake Sammamish

This chart illustrates the average monthly humidity levels in West Lake Sammamish, 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 West Lake Sammamish is approximately 63%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec86%86%87%84%81%82%79%63%62%83%89%88%
Data source: Humidity data for August generated using information from the Copernicus Climate Change Service.

August UV Index in West Lake Sammamish

In West Lake Sammamish 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 West Lake Sammamish.

Maximum UV Index Levels in West Lake Sammamish for August

The chart shows the monthly maximum UV Index (UVI) for West Lake Sammamish 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 West Lake Sammamish typically reaches 8, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec235689987522
Data source: West Lake Sammamish 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 West Lake Sammamish Compares to Other Months

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

This table compares monthly weather conditions in West Lake Sammamish, showing how August’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather5°C (40°F)199 mm (7.9 inches)86%low
February Weather4°C (39°F)234 mm (9.2 inches)86%moderate
March Weather7°C (44°F)152 mm (6.0 inches)87%moderate
April Weather9°C (49°F)144 mm (5.7 inches)84%high
May Weather13°C (55°F)85 mm (3.3 inches)81%very high
June Weather16°C (60°F)78 mm (3.1 inches)82%very high
July Weather18°C (65°F)28 mm (1.1 inches)79%very high
August Weather18°C (65°F)23 mm (0.9 inches)63%very high
September Weather15°C (60°F)115 mm (4.5 inches)62%high
October Weather10°C (50°F)204 mm (8.1 inches)83%moderate
November Weather7°C (45°F)217 mm (8.5 inches)89%low
December Weather4°C (40°F)235 mm (9.3 inches)88%low

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