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
August is the month that records the highest temperatures, with averages ranging from a high of 73.6°F (23.1°C) to a low of 51.4°F (10.8°C).Humidity
In August, the average relative humidity in Sumas is 74%.Rainfall
In Sumas, Washington, during August, the rain falls for 7.8 days and regularly aggregates up to 1.18" (30mm) of precipitation. Throughout the year, there are 188 rainfall days, and 49.88" (1267mm) of precipitation is accumulated.Snowfall
In Sumas, Washington, snow does not fall in May through October.Daylight
In August, the average length of the day in Sumas is 14h and 19min.On the first day of August in Sumas, sunrise is at 5:43 am and sunset at 8:47 pm. On the last day of the month, sunrise is at 6:25 am and sunset at 7:52 pm PDT.
Sunshine
The month with the most sunshine is August, with an average of 10.3h of sunshine.UV index
In Sumas, Washington, the average daily maximum UV index in August is 4. A UV Index of 3 to 5 symbolizes a medium vulnerability from exposure to the Sun's UV radiation for the average person.Note: In August, the maximum UV index of 4 suggests these recommendations:
Exercise caution. Those with pale skin may experience burns in less than half an hour. The midday Sun can be harmful due to its potent UV radiation; seek shade and reduce exposure. For a sun-safe wardrobe, go for clothes that are tightly woven and generously sized.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What part of the year is the hottest in Sumas?
What are August temperatures in Sumas?
What is the average humidity in August in Sumas?
How many days does it rain in August in Sumas?
When it does not snow in Sumas?
What is the average length of the day in August in Sumas?
When is the sunrise / sunset in August in Sumas?
What month has the most sunshine in Sumas?
How many hours of sunshine does Sumas have in August?
What is the UV index intensity in August in Sumas?
Average temperature in August
Sumas, WA
- Average high temperature in August: 73.6°F
The warmest month (with the highest average high temperature) is August (73.6°F).
The month with the lowest average high temperature is December (39.6°F).
- Average low temperature in August: 51.4°F
The month with the highest average low temperature is August (51.4°F).
The coldest months (with the lowest average low temperature) are February and December (31.6°F).
Average pressure in August
Sumas, WA
- Average pressure in August: 30"Hg
The month with the highest atmospheric pressure is January (30.09"Hg).
The months with the lowest atmospheric pressure are March and August (30"Hg).
Average wind speed in August
Sumas, WA
- Average wind speed in August: 3.2mph
The windiest months (with the highest average wind speed) are January and February (4.7mph).
The calmest month (with the lowest average wind speed) is August (3.2mph).
Average humidity in August
Sumas, WA
- Average humidity in August: 74%
The month with the highest relative humidity is January (87%).
The month with the lowest relative humidity is July (73%).
Average rainfall in August
Sumas, WA
- Average rainfall in August: 1.18"
The wettest month (with the highest rainfall) is November (7.72").
The driest month (with the least rainfall) is July (0.91").
Average rainfall days in August
Sumas, WA
- Average rainfall days in August: 7.8 days
The month with the highest number of rainy days is March (20.5 days).
The month with the least rainy days is August (7.8 days).
Average snowfall in August
Sumas, WA
- Average snowfall in August: 0"
The month with the highest snowfall is February (3.11").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in August
Sumas, WA
- Average snowfall days in August: 0 days
The month with the highest number of snowfall days is February (4.7 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
Sumas, WA
- Average daylight in August: 14h and 2min
The month with the longest days is June (Average daylight: 16h and 6min).
The month with the shortest days is December (Average daylight: 8h and 18min).
- Average sunshine in August: 10h and 2min
The month with the most sunshine is August (Average sunshine: 10h and 18min).
The month with the least sunshine is December (Average sunshine: 3h and 48min).
Average sunshine days in August
Sumas, WA
- Average sunshine days in August: 21 days
The months with the most sunshine days are July and August (21 days).
The month with the least sunshine days is March (8.4 days).
Average UV index in August
Sumas, 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, October, November and December (UV index 2).
Average cloud cover in August
Sumas, WA
- Average cloud cover in August: 30
The month with the most cloud cover is March (Cloud cover 60).
The months with the least cloud cover are July and August (Cloud cover 30).
Average visibility in August
Sumas, WA
- Average visibility in August: 5mi
The months with the highest visibility are April, May, June, July, August, September and October (5mi).
The months with the lowest visibility are January, February, March, November and December (4mi).
Sumas, Washington, USA
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