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August Weather in Mount Rainier, United States

Last updated: June 24, 2025

In Mount Rainier, United States, the average temperature in August hovers around 25°C (77°F), with a minimum of 14°C (58°F) and a peak at 37°C (99°F). This month sees about 140 mm (5.5 in) of precipitation spread across 15 days, contributing to an average humidity of 72%.

August Temperature in Mount Rainier

In August in Mount Rainier, the average temperature is 25°C (77°F). Maximum temperatures can reach as high as 37°C (99°F), while minimums can drop to as low as 14°C (58°F). This pleasant range makes Mount Rainier a great destination for travelers looking to enjoy warm weather while still having the option for cooler evenings.

August Weather in Mount Rainier: Daily Temperature Highs, Lows, and Averages

The chart illustrates August temperature patterns in Mount Rainier, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Mount Rainier, August typically has an average temperature of 25°C (77°F), with highs reaching up to 37°C (99°F) and lows dropping to around 14°C (58°F).
JanFebMarAprMayJunJulAugSepOctNovDec374146566675807772624740
Data source: Temperature data for Mount Rainier 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 Mount Rainier

In Mount Rainier in August, the total precipitation amount is 140 mm (5.5 in) over a span of 15 days.

August Precipitation Trends in Mount Rainier

The chart displays monthly precipitation patterns in Mount Rainier, 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 Mount Rainier, August typically receives around 140 mm (5.5 inches) of precipitation spread over approximately 15 days.
JanFebMarAprMayJunJulAugSepOctNovDec619887100127118157140951058193
Data source: Precipitation data for August generated using information from the Copernicus Climate Change Service.
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August Humidity in Mount Rainier

In Mount Rainier in August, humidity is 72%. With an average temperature of 25°C (77°F), this humidity feels like a warm embrace that clings to your skin, making outdoor exploration both vibrant and a bit taxing as you sweat slightly more and seek shade often while enjoying the scenery.

August Average Humidity in Mount Rainier

This chart illustrates the average monthly humidity levels in Mount Rainier, 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 Mount Rainier is approximately 72%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec84%83%83%81%78%79%74%72%75%81%85%84%
Data source: Humidity data for August generated using information from the Copernicus Climate Change Service.

August UV Index in Mount Rainier

In Mount Rainier in August, the maximum UV index is 9, which corresponds to a very high Exposure Category. The time to burn is just 15 minutes, so it's essential to take precautions. For detailed information, you can check the Hourly UV Index in Mount Rainier.

Maximum UV Index Levels in Mount Rainier for August

The chart shows the monthly maximum UV Index (UVI) for Mount Rainier 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 Mount Rainier typically reaches 9, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec357910101098753
Data source: Mount Rainier 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 Mount Rainier Compares to Other Months

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

This table compares monthly weather conditions in Mount Rainier, showing how August’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather3°C (37°F)61 mm (2.4 inches)84%moderate
February Weather5°C (41°F)98 mm (3.9 inches)83%moderate
March Weather8°C (46°F)87 mm (3.4 inches)83%high
April Weather14°C (57°F)100 mm (4.0 inches)81%very high
May Weather19°C (66°F)127 mm (5.0 inches)78%very high
June Weather24°C (75°F)118 mm (4.7 inches)79%very high
July Weather27°C (81°F)157 mm (6.2 inches)74%very high
August Weather25°C (77°F)140 mm (5.5 inches)72%very high
September Weather22°C (72°F)95 mm (3.8 inches)75%very high
October Weather17°C (62°F)104 mm (4.1 inches)81%high
November Weather8°C (47°F)81 mm (3.2 inches)85%moderate
December Weather5°C (41°F)93 mm (3.7 inches)84%moderate

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