Contents
- Weather in August
- Frequently asked questions
- Average temperature in August
- Average pressure in August
- Average wind speed in August
- Average humidity in August
- Average rainfall in August
- Average rainfall days in August
- Average snowfall in August
- Average snowfall days in August
- Average daylight in August
- Average sunshine in August
- Average sunshine days in August
- Average UV index in August
- Average cloud cover in August
- Average visibility in August
Weather in August
Temperature
July and August mark Mount Vernon's peak of temperatures, averaging a high-temperature of 20.2°C (68.4°F).Humidity
In August, the average relative humidity is 77%.Rainfall
In Mount Vernon, in August, during 7.2 rainfall days, 25mm (0.98") of precipitation is typically accumulated. Throughout the year, there are 185.2 rainfall days, and 882mm (34.72") of precipitation is accumulated.Snowfall
May through October are months without snowfall.Daylight
In Mount Vernon, the average length of the day in August is 14h and 16min.On the first day of August, sunrise is at 5:45 am and sunset at 8:45 pm. On the last day of the month, sunrise is at 6:26 am and sunset at 7:52 pm PDT.
Sunshine
July and August, with an average of 10.4h of sunshine, are months with the most sunshine.UV index
In August, the average daily maximum UV index is 4. A UV Index value of 3 to 5 symbolizes a moderate health risk from exposure to the Sun's UV rays for average individuals.Note: In August, the UV index of 4 transforms into the following advice:
Exercise prudence. Persons with fair skin could be burned in under 30 minutes. The Sun's most harmful UV rays are emitted around midday; avoid staying outdoors for long during this time. Select sunglasses that boast both UVA and UVB protection to limit the adverse effects of the sun on the eyes.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What part of the year is the hottest?
What is the usual temperature for Mount Vernon in August?
What is the average humidity in August?
How many days does it rain in August?
When it does not snow?
How many hours of daylight does Mount Vernon have in August?
When is the sunrise / sunset in August in Mount Vernon?
What are the months with the most sunshine?
How long on average sun shines in August?
What is the UV index reading in August?
Average temperature in August
Mount Vernon, WA
- Average high temperature in August: 20.2°C
The warmest months (with the highest average high temperature) are July and August (20.2°C).
The month with the lowest average high temperature is December (5.9°C).
- Average low temperature in August: 12.3°C
The month with the highest average low temperature is August (12.3°C).
The coldest month (with the lowest average low temperature) is February (2.3°C).
Average pressure in August
Mount Vernon, WA
- Average pressure in August: 1016.2mbar
The month with the highest atmospheric pressure is January (1018.8mbar).
The month with the lowest atmospheric pressure is March (1016.1mbar).
Average wind speed in August
Mount Vernon, WA
- Average wind speed in August: 5.9km/h
The windiest month (with the highest average wind speed) is November (12.1km/h).
The calmest month (with the lowest average wind speed) is August (5.9km/h).
Average humidity in August
Mount Vernon, WA
- Average humidity in August: 77%
The months with the highest relative humidity are January and February (83%).
The month with the lowest relative humidity is July (75%).
Average rainfall in August
Mount Vernon, WA
- Average rainfall in August: 25mm
The wettest month (with the highest rainfall) is November (126mm).
The driest month (with the least rainfall) is July (16mm).
Average rainfall days in August
Mount Vernon, WA
- Average rainfall days in August: 7.2 days
The month with the highest number of rainy days is March (20.8 days).
The month with the least rainy days is August (7.2 days).
Average snowfall in August
Mount Vernon, WA
- Average snowfall in August: 0mm
The month with the highest snowfall is February (90mm).
The months with the least snowfall are May, June, July, August, September and October (0mm).
Average snowfall days in August
Mount Vernon, WA
- Average snowfall days in August: 0 days
The month with the highest number of snowfall days is February (3.6 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).
Average daylight in August /
Average sunshine in August
Mount Vernon, WA
- Average daylight in August: 14h and 2min
The month with the longest days is June (Average daylight: 16h and 0min).
The month with the shortest days is December (Average daylight: 8h and 24min).
- Average sunshine in August: 10h and 2min
The months with the most sunshine are July and August (Average sunshine: 10h and 24min).
The month with the least sunshine is December (Average sunshine: 3h and 54min).
Average sunshine days in August
Mount Vernon, WA
- Average sunshine days in August: 22.3 days
The month with the most sunshine days is August (22.3 days).
The month with the least sunshine days is November (8.1 days).
Average UV index in August
Mount Vernon, WA
- Average UV index in August: 4
The month with the highest UV index is July (UV index 5).
The months with the lowest UV index are January, February, November and December (UV index 2).
Average cloud cover in August
Mount Vernon, WA
- Average cloud cover in August: 26
The month with the most cloud cover is December (Cloud cover 59).
The month with the least cloud cover is August (Cloud cover 26).
Average visibility in August
Mount Vernon, WA
- Average visibility in August: 9km
The month with the highest visibility is July (10km).
The months with the lowest visibility are January, February, March, April, May, June, August, September, October, November and December (9km).
Mount Vernon, Washington, USA
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