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August Weather in Sumas, United States

Last updated: June 24, 2025

In August, the average temperature in Sumas, United States hovers around 18°C (64°F). Expect a range with minimums dipping to 7°C (44°F) and maximums soaring up to 35°C (94°F). During this month, you'll encounter approximately 27 mm (1.1 in) of precipitation over about 5 days, contributing to an average humidity of 77%. Ideal conditions for those who enjoy a touch of warmth!

August Temperature in Sumas

In August in Sumas, the average temperature is 18°C (64°F), with maximums reaching 35°C (94°F) and minimums dropping as low as 7°C (44°F). This diverse temperature range makes it an ideal time for travelers to experience the region's outdoor activities while enjoying comfortable evenings.

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

The chart illustrates August temperature patterns in Sumas, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Sumas, August typically has an average temperature of 18°C (64°F), with highs reaching up to 35°C (94°F) and lows dropping to around 7°C (44°F).
JanFebMarAprMayJunJulAugSepOctNovDec373541465459636458484236
Data source: Temperature data for Sumas 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 Sumas

In Sumas in August, the precipitation amount is 27 mm (1.1 in) over a period of 5 days.

August Precipitation Trends in Sumas

The chart displays monthly precipitation patterns in Sumas, 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 Sumas, August typically receives around 27 mm (1.1 inches) of precipitation spread over approximately 5 days.
JanFebMarAprMayJunJulAugSepOctNovDec240214197162103824527166229317269
Data source: Precipitation data for August generated using information from the Copernicus Climate Change Service.
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August Humidity in Sumas

In Sumas in August humidity is 77%. With an average temperature of 18°C (64°F), this humidity feels like a warm embrace, making it feel muggy and potentially uncomfortable for traveling, as sweat clings to your skin and the air thickens around you.

August Average Humidity in Sumas

This chart illustrates the average monthly humidity levels in Sumas, 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 Sumas is approximately 77%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec87%86%88%86%82%82%85%77%76%88%88%89%
Data source: Humidity data for August generated using information from the Copernicus Climate Change Service.

August UV Index in Sumas

In Sumas 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 Sumas.

Maximum UV Index Levels in Sumas for August

The chart shows the monthly maximum UV Index (UVI) for Sumas 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 Sumas typically reaches 8, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec235678986421
Data source: Sumas 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 Sumas Compares to Other Months

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

This table compares monthly weather conditions in Sumas, showing how August’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather3°C (37°F)240 mm (9.4 inches)87%low
February Weather2°C (35°F)214 mm (8.4 inches)86%moderate
March Weather5°C (41°F)197 mm (7.8 inches)88%moderate
April Weather8°C (47°F)162 mm (6.4 inches)86%high
May Weather12°C (54°F)103 mm (4.0 inches)82%high
June Weather15°C (59°F)82 mm (3.2 inches)82%very high
July Weather17°C (63°F)44 mm (1.8 inches)85%very high
August Weather18°C (64°F)27 mm (1.1 inches)77%very high
September Weather14°C (58°F)166 mm (6.5 inches)76%high
October Weather9°C (48°F)229 mm (9.0 inches)88%moderate
November Weather5°C (42°F)317 mm (12.5 inches)88%low
December Weather2°C (36°F)269 mm (10.6 inches)89%low

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