Sumas, WA has a humid continental climate with hot summers and cold winters. The average high temperature in the summer months is around 85°F, while the average low temperature in the winter months is around 25°F. Precipitation is evenly distributed throughout the year and snowfall can occur during the winter months. Summer months tend to be dry with sporadic rain showers. The town of Sumas typically experiences moderate winds throughout the year, with occasional gusts during colder months which can make temperatures feel even chillier than they are.
Sumas, Washington gets 40 inches of rain, on average, per year. The US average is 38 inches of rain per year.
Sumas averages 7 inches of snow per year. The US average is 28 inches of snow per year.
On average, there are 155 sunny days per year in Sumas. The US average is 205 sunny days.
Sumas gets some kind of precipitation, on average, 164 days per year. Precipitation is rain, snow, sleet, or hail that falls to the ground. In order for precipitation to be counted you have to get at least .01 inches on the ground to measure.
Weather Highlights
Summer High: the July high is around 74 degrees
Winter Low: the January low is 34
Rain: averages 40 inches of rain a year
Snow: averages 7 inches of snow a year