2025 Compare Climate & Weather:
Mattawa, WA vs Boise City, ID

Highlights

On average, there are 206 sunny days per year in Boise City. Mattawa averages 188 sunny days per year. The US average is 205 sunny days.

Boise City, Idaho gets 13 inches of rain, on average, per year. Mattawa, Washington gets 7.5 inches of rain, on average, per year. The US average is 38.1 inches of rain per year.

Boise City averages 17.5 inches of snow per year. Mattawa averages 9.1 inches of snow per year. The US average is 27.8 inches of snow per year.

Weather Highlights

Boise City, Idaho
Summer High: the July high is around 91.6 degrees
Winter Low: the January low is 23.7
Rain: averages 13 inches of rain a year
Snow: averages 17.5 inches of snow a year

Mattawa, Washington
Summer High: the July high is around 91.1 degrees
Winter Low: the January low is 27.1
Rain: averages 7.5 inches of rain a year
Snow: averages 9.1 inches of snow a year

BestPlaces Comfort Index

The annual BestPlaces Comfort Index for Boise is 7.3 (10=best), which means it is one of the most pleasant places in Idaho.

The annual BestPlaces Comfort Index for Mattawa is 7.6 (10=best), which means it is one of the most pleasant places in Washington.

Today's Weather - Mattawa, WA

68°F

Today's Weather - Boise City, ID

75°F

Average Monthly High / Low (°F)

Hot, Freezing, Rainy, Snowy Days: Mattawa / Boise City

July is the hottest month for Mattawa with an average high temperature of 91.1°, which ranks it as one of the hottest places in Washington. In Mattawa, there are 3 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Mattawa are May, September and June.

July is the hottest month for Boise with an average high temperature of 91.6°, which ranks it as one of the hottest places in Idaho. In Boise, there are 3 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Boise are September, June and May.

December has the coldest nighttime temperatures for Mattawa with an average of 25.3°. This is colder than most places in Washington.

December has the coldest nighttime temperatures for Boise with an average of 22.7°. This is warmer than most places in Idaho.

In Mattawa, there are 45.7 days annually when the high temperature is over 90°, which is one of the hottest places in Washington.

In Boise, there are 51.0 days annually when the high temperature is over 90°, which is one of the hottest places in Idaho.

In Mattawa, there are 97.4 days annually when the nighttime low temperature falls below freezing, which is colder than most places in Washington.

In Boise, there are 114.9 days annually when the nighttime low temperature falls below freezing, which is one of the warmest places in Idaho.

In Mattawa, there are 1.2 days annually when the nighttime low temperature falls below zero°, which is colder than most places in Washington.

In Boise, there are 2.8 days annually when the nighttime low temperature falls below zero°, which is warmer than most places in Idaho.

December is the wettest month in Mattawa with 1.3 inches of rain, and the driest month is July with 0.2 inches. The wettest season is Spring with 39% of yearly precipitation and 12% occurs in Autumn, which is the driest season. The annual rainfall of 7.5 inches in Mattawa means that it is one of the driest places in Washington.


December is the wettest month in Boise with 1.9 inches of rain, and the driest month is July with 0.3 inches. The wettest season is Spring with 35% of yearly precipitation and 10% occurs in Autumn, which is the driest season. The annual rainfall of 13.0 inches in Boise means that it is about average compared to other places in Idaho.

December is the rainiest month in Mattawa with 8.1 days of rain, and July is the driest month with only 1.7 rainy days. There are 59.1 rainy days annually in Mattawa, which is one of the least rainy places in Washington. The rainiest season is Spring when it rains 37% of the time and the driest is Autumn with only a 12% chance of a rainy day.

December is the rainiest month in Boise with 11.3 days of rain, and August is the driest month with only 2.3 rainy days. There are 87.0 rainy days annually in Boise, which is less rainy than most places in Idaho. The rainiest season is Spring when it rains 35% of the time and the driest is Autumn with only a 12% chance of a rainy day.

An annual snowfall of 9.1 inches in Mattawa means that it is snowier than most places in Washington.

An annual snowfall of 17.5 inches in Boise means that it is less snowy than most places in Idaho.

December is the snowiest month in Mattawa with 4.8 inches of snow, and 4 months of the year have significant snowfall.

December is the snowiest month in Boise with 6.4 inches of snow, and 5 months of the year have significant snowfall.