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August Weather in Chehalis, United States

Last updated: June 24, 2025

In August, the average temperature in Chehalis, United States hovers around 19°C (66°F). Visitors can expect a range from a cool 7°C (45°F) to a balmy 37°C (98°F). Throughout the month, precipitation is modest, with an average of 15 mm (0.6 in) spread over about 3 days. The average humidity is relatively high at 73%, adding a touch of warmth to the climate.

August Temperature in Chehalis

In August in Chehalis, the average temperature is 19°C (66°F). Maximums can reach 37°C (98°F), while minimums can drop to as low as 7°C (45°F). Be prepared for a range of temperatures during your travels, packing accordingly for both warm and cool conditions.

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

The chart illustrates August temperature patterns in Chehalis, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Chehalis, August typically has an average temperature of 19°C (66°F), with highs reaching up to 37°C (98°F) and lows dropping to around 7°C (45°F).
JanFebMarAprMayJunJulAugSepOctNovDec414044495560646560504540
Data source: Temperature data for Chehalis 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 Chehalis

In Chehalis in August, the precipitation amount is 15 mm (0.6 in) over the course of 3 days.

August Precipitation Trends in Chehalis

The chart displays monthly precipitation patterns in Chehalis, 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 Chehalis, August typically receives around 15 mm (0.6 inches) of precipitation spread over approximately 3 days.
JanFebMarAprMayJunJulAugSepOctNovDec1871691371197154121588132181198
Data source: Precipitation data for August generated using information from the Copernicus Climate Change Service.
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August Humidity in Chehalis

In Chehalis in August humidity is 73%. With an average temperature of 19°C (66°F), this humidity feels like a warm embrace, making travel enjoyable yet slightly sticky, as you find yourself seeking shade and refreshing drinks while exploring.

August Average Humidity in Chehalis

This chart illustrates the average monthly humidity levels in Chehalis, 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 Chehalis is approximately 73%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec86%84%85%83%84%84%82%73%74%83%86%87%
Data source: Humidity data for August generated using information from the Copernicus Climate Change Service.

August UV Index in Chehalis

In Chehalis 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 Chehalis.

Maximum UV Index Levels in Chehalis for August

The chart shows the monthly maximum UV Index (UVI) for Chehalis 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 Chehalis typically reaches 8, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec235699987532
Data source: Chehalis 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 Chehalis Compares to Other Months

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

This table compares monthly weather conditions in Chehalis, showing how August’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather5°C (41°F)186 mm (7.3 inches)86%low
February Weather4°C (40°F)169 mm (6.7 inches)84%moderate
March Weather7°C (45°F)137 mm (5.4 inches)85%moderate
April Weather10°C (49°F)119 mm (4.7 inches)83%high
May Weather13°C (56°F)71 mm (2.8 inches)84%very high
June Weather16°C (60°F)54 mm (2.1 inches)84%very high
July Weather18°C (65°F)12 mm (0.5 inches)82%very high
August Weather19°C (66°F)15 mm (0.6 inches)73%very high
September Weather16°C (61°F)88 mm (3.5 inches)74%high
October Weather10°C (51°F)132 mm (5.2 inches)83%moderate
November Weather7°C (45°F)181 mm (7.1 inches)86%moderate
December Weather5°C (40°F)198 mm (7.8 inches)87%low

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