August weather forecastRoslyn, WA
August
Weather in August
August, the last month of the summer in Roslyn, is also a moderately hot month, with temperature in the range of an average low of 47.8°F (8.8°C) and an average high of 75.4°F (24.1°C).Temperature
In Roslyn, August is the warmest month, with temperatures averaging a high of 75.4°F (24.1°C) and a low of 47.8°F (8.8°C).Humidity
July and August, with an average relative humidity of 60%, are the least humid months in Roslyn.Rainfall
In Roslyn, in August, during 5.5 rainfall days, 0.51" (13mm) of precipitation is typically accumulated. In Roslyn, during the entire year, the rain falls for 161.2 days and collects up to 28.46" (723mm) of precipitation.Snowfall
In Roslyn, snow does not fall in June through August.Daylight
The average length of the day in August is 14h and 11min.On the first day of August in Roslyn, sunrise is at 5:43 am and sunset at 8:36 pm. On the last day of the month, sunrise is at 6:22 am and sunset at 7:45 pm PDT.
Sunshine
With an average of 11.9h of sunshine, August has the most sunshine of the year.UV index
In August, the average daily maximum UV index is 4. A UV Index value of 3 to 5 symbolizes a moderate threat to health from unprotected exposure to Sun's UV rays for the ordinary person.Note: The daily high UV index of 4 during August translates into the following recommendations:
Heed the precautions - Protecting the skin and eyes from damage is compulsory. To protect against the Sun's most potent rays, avoid direct exposure around midday. It's wise to wear UVA and UVB-blocking sunglasses when the sun shines brightly.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in August
Roslyn, WA
- Average high temperature in August: 75.4°F
The warmest month (with the highest average high temperature) is August (75.4°F).
The month with the lowest average high temperature is December (29.7°F).
- Average low temperature in August: 47.8°F
The month with the highest average low temperature is August (47.8°F).
The coldest month (with the lowest average low temperature) is December (18.3°F).
Average pressure in August
Roslyn, WA
- Average pressure in August: 29.96"Hg
The month with the highest atmospheric pressure is January (30.14"Hg).
The month with the lowest atmospheric pressure is August (29.96"Hg).
Average wind speed in August
Roslyn, WA
- Average wind speed in August: 6.1mph
The windiest month (with the highest average wind speed) is June (6.7mph).
The calmest month (with the lowest average wind speed) is December (4.2mph).
Average humidity in August
Roslyn, WA
- Average humidity in August: 60%
The months with the highest relative humidity are January and February (92%).
The months with the lowest relative humidity are July and August (60%).
Average rainfall in August
Roslyn, WA
- Average rainfall in August: 0.51"
The wettest month (with the highest rainfall) is January (4.41").
The driest month (with the least rainfall) is July (0.39").
Average rainfall days in August
Roslyn, WA
- Average rainfall days in August: 5.5 days
The months with the highest number of rainy days are March and April (18.3 days).
The month with the least rainy days is August (5.5 days).
Average snowfall in August
Roslyn, WA
- Average snowfall in August: 0"
The month with the highest snowfall is January (16.3").
The months with the least snowfall are June, July and August (0").
Average snowfall days in August
Roslyn, WA
- Average snowfall days in August: 0 days
The month with the highest number of snowfall days is December (15.1 days).
The months with the least snowfall days are June, July and August (0 days).
Average daylight in August /
Average sunshine in August
Roslyn, WA
- Average daylight in August: 14h and 12min
The month with the longest days is June (Average daylight: 15h and 54min).
The month with the shortest days is December (Average daylight: 8h and 36min).
- Average sunshine in August: 11h and 54min
The month with the most sunshine is August (Average sunshine: 11h and 54min).
The month with the least sunshine is January (Average sunshine: 3h and 24min).
Average sunshine days in August
Roslyn, WA
- Average sunshine days in August: 22.8 days
The month with the most sunshine days is August (22.8 days).
The month with the least sunshine days is February (6.8 days).
Average UV index in August
Roslyn, 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 1).
Average cloud cover in August
Roslyn, WA
- Average cloud cover in August: 18
The month with the most cloud cover is January (Cloud cover 63).
The months with the least cloud cover are July and August (Cloud cover 18).
Average visibility in August
Roslyn, WA
- Average visibility in August: 6mi
The months with the highest visibility are May, June, July, August and September (6mi).
The month with the lowest visibility is January (3mi).
