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August Weather in Mount Vernon, United States

Last updated: June 24, 2025

In August, the average temperature in Mount Vernon, United States reaches a warm 28°C (82°F). Expect minimums of 17°C (64°F) and highs soaring to 40°C (105°F). With an average humidity of 81%, the month also brings 119 mm (4.7 in) of precipitation over 17 days. Prepare for a mix of sun and rain as you enjoy the vibrant climate!

August Temperature in Mount Vernon

In August in Mount Vernon, the average temperature is 28°C (82°F). Maximums can reach 40°C (105°F), and minimums can be as low as 17°C (64°F). Travelers should be prepared for warm days and cooler evenings while exploring this vibrant destination.

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

The chart illustrates August temperature patterns in Mount Vernon, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Mount Vernon, August typically has an average temperature of 28°C (82°F), with highs reaching up to 40°C (105°F) and lows dropping to around 17°C (64°F).
JanFebMarAprMayJunJulAugSepOctNovDec515761677580838279725853
Data source: Temperature data for Mount Vernon 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 Vernon

In Mount Vernon in August, the precipitation amount is 119 mm (4.7 in) spread across 17 days.

August Precipitation Trends in Mount Vernon

The chart displays monthly precipitation patterns in Mount Vernon, 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 Vernon, August typically receives around 119 mm (4.7 inches) of precipitation spread over approximately 17 days.
JanFebMarAprMayJunJulAugSepOctNovDec83101748284108126119998456124
Data source: Precipitation data for August generated using information from the Copernicus Climate Change Service.
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August Humidity in Mount Vernon

In Mount Vernon in August, humidity is 81%. With an average temperature of 28°C (82°F), this humidity feels like a warm blanket wrapped around you, making traveling somewhat uncomfortable as the air thickens, leaving you longing for a refreshing breeze.

August Average Humidity in Mount Vernon

This chart illustrates the average monthly humidity levels in Mount Vernon, 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 Vernon is approximately 81%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec86%84%83%81%81%81%83%81%82%78%86%89%
Data source: Humidity data for August generated using information from the Copernicus Climate Change Service.

August UV Index in Mount Vernon

In Mount Vernon in August, the maximum UV index reaches 11, which corresponds to an extreme Exposure Category. With a time to burn of just 10 minutes, it's essential to take precautions. For more details, you can check the Hourly UV Index in Mount Vernon.

Maximum UV Index Levels in Mount Vernon for August

The chart shows the monthly maximum UV Index (UVI) for Mount Vernon 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 Vernon typically reaches 11, which falls under the extreme exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec479101111111110864
Data source: Mount Vernon 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 Vernon Compares to Other Months

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

This table compares monthly weather conditions in Mount Vernon, showing how August’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather11°C (52°F)83 mm (3.2 inches)86%moderate
February Weather14°C (57°F)101 mm (4.0 inches)84%high
March Weather16°C (62°F)74 mm (2.9 inches)83%very high
April Weather20°C (68°F)82 mm (3.2 inches)81%very high
May Weather24°C (76°F)84 mm (3.3 inches)81%extreme
June Weather27°C (80°F)108 mm (4.3 inches)81%extreme
July Weather28°C (83°F)126 mm (5.0 inches)83%extreme
August Weather28°C (82°F)119 mm (4.7 inches)81%extreme
September Weather26°C (80°F)99 mm (3.9 inches)82%very high
October Weather22°C (72°F)83 mm (3.3 inches)78%very high
November Weather14°C (58°F)56 mm (2.2 inches)86%high
December Weather12°C (54°F)124 mm (4.9 inches)89%moderate

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