Sumas, WA Weather


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The most pleasant months of the year for Sumas are August, July and September. In Sumas, there are 2 comfortable months with high temperatures in the range of 70-85°. August is the hottest month for Sumas with an average high temperature of 74.2°, which ranks it as cooler than most places in Washington. January is the snowiest month in Sumas with 2.1 inches of snow, and 5 months of the year have significant snowfall. There are few days during the summer when the humidity becomes unpleasant.

Today's Weather - Sumas, WA

10 AM PST

Sunny

55°F

7 DAY FORECASTDESCRIPTIONHIGH/LOWWIND
TodaySunny69° / 43°ENE 7 to 10 mph
SaturdayMostly Sunny then Heavy Rain69° / 42°ESE 8 to 15 mph
SundayRain Showers53° / 39°SSW 15 mph
MondayMostly Sunny62° / 43°N 5 to 8 mph
TuesdayPartly Sunny then Chance Rain Showers65° / 44°W 6 to 9 mph
WednesdayChance Rain Showers58° / 45°SSW 7 to 10 mph
ThursdayChance Light Rain57° / 45°S 9 mph

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


BESTPLACES COMFORT INDEX

The annual BestPlaces Comfort Index for the Sumas area is 9.1 (10=best), which means it is more comfortable than most places in Washington.

9.1 / 10

A higher score indicates a more comfortable year-round climate. The US average for the comfort index is 7.8. Our index is based on the total number of days annually within the comfort range of 70-80 degrees, and we also applied a penalty for days of excessive humidity.


Average Monthly High and Low (°F)
HighLow
January46° 34°
February49° 34°
March53° 37°
April59° 41°
May64° 46°
June69° 50°
July74° 53°
August74° 53°
September69° 48°
October59° 43°
November50° 38°
December44° 33°
Hot, Freezing, Rainy, Snowy Days: Sumas
Hot
Days
Freezing
Days
Rainy
Days
Snowy
Days
January012191
February010151
March06181
April02150
May00130
June00110
July0060
August0060
September0090
October02150
November06200
December013181

YOU SHOULD KNOW

Many people confuse weather and climate but they are different. Weather is the conditions of the atmosphere over a short period of time, and climate is how the atmosphere is over long periods of time.

Weather is how the atmosphere is behaving and its effects upon life and human activities. Weather can change from minute-to-minute. Most people think of weather in terms of temperature, humidity, precipitation, cloudiness, brightness, visibility, wind, and atmospheric pressure.

Climate is the description of the long-term pattern of weather in a place. Climate can mean the average weather for a particular region and time period taken over 30 years. Climate is the average of weather over time.

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