2025 Compare Climate & Weather:
Seattle, WA vs Waterloo, IA

Highlights

On average, there are 194 sunny days per year in Waterloo. Seattle averages 152 sunny days per year. The US average is 205 sunny days.

Waterloo, Iowa gets 35.7 inches of rain, on average, per year. Seattle, Washington gets 38 inches of rain, on average, per year. The US average is 38.1 inches of rain per year.

Waterloo averages 33.9 inches of snow per year. Seattle averages 4.6 inches of snow per year. The US average is 27.8 inches of snow per year.

Weather Highlights

Waterloo, Iowa
Summer High: the July high is around 83.4 degrees
Winter Low: the January low is 8.4
Rain: averages 35.7 inches of rain a year
Snow: averages 33.9 inches of snow a year

Seattle, Washington
Summer High: the July high is around 75.8 degrees
Winter Low: the January low is 37
Rain: averages 38 inches of rain a year
Snow: averages 4.6 inches of snow a year

BestPlaces Comfort Index

The annual BestPlaces Comfort Index for Waterloo is 6.7 (10=best), which means it is less comfortable than most places in Iowa.

The annual BestPlaces Comfort Index for Seattle is 7.5 (10=best), which means it is one of the most pleasant places in Washington.

Today's Weather - Seattle, WA

55°F

Today's Weather - Waterloo, IA

57°F

Average Monthly High / Low (°F)

Hot, Freezing, Rainy, Snowy Days: Seattle / Waterloo

August is the hottest month for Seattle with an average high temperature of 76.3°, which ranks it as cooler than most places in Washington. In Seattle, there are 4 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Seattle are August, July and September.

July is the hottest month for Waterloo with an average high temperature of 83.4°, which ranks it as cooler than most places in Iowa. In Waterloo, there are 5 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Waterloo are June, August and September.

December has the coldest nighttime temperatures for Seattle with an average of 35.9°. This is one of the warmest places in Washington.

January has the coldest nighttime temperatures for Waterloo with an average of 8.4°. This is colder than most places in Iowa.

In Seattle, there are 1.7 days annually when the high temperature is over 90°, which is cooler than most places in Washington.

In Waterloo, there are 11.5 days annually when the high temperature is over 90°, which is cooler than most places in Iowa.

In Seattle, there are 24.0 days annually when the nighttime low temperature falls below freezing, which is one of the warmest places in Washington.

In Waterloo, there are 150.4 days annually when the nighttime low temperature falls below freezing, which is about average compared to other places in Iowa.

In Seattle, there are 0.0 days annually when the nighttime low temperature falls below zero°, which is about average compared to other places in Washington.

In Waterloo, there are 21.5 days annually when the nighttime low temperature falls below zero°, which is colder than most places in Iowa.

November is the wettest month in Seattle with 6.2 inches of rain, and the driest month is July with 0.8 inches. The wettest season is Spring with 39% of yearly precipitation and 9% occurs in Autumn, which is the driest season. The annual rainfall of 38.0 inches in Seattle means that it is about average compared to other places in Washington.


June is the wettest month in Waterloo with 5.2 inches of rain, and the driest month is January with 0.9 inches. The wettest season is Autumn with 41% of yearly precipitation and 9% occurs in Spring, which is the driest season. The annual rainfall of 35.7 inches in Waterloo means that it is about average compared to other places in Iowa.

November is the rainiest month in Seattle with 18.7 days of rain, and August is the driest month with only 5.3 rainy days. There are 155.3 rainy days annually in Seattle, which is about average compared to other places in Washington. The rainiest season is Spring when it rains 33% of the time and the driest is Autumn with only a 13% chance of a rainy day.

May is the rainiest month in Waterloo with 11.9 days of rain, and February is the driest month with only 6.5 rainy days. There are 105.3 rainy days annually in Waterloo, which is rainier than most places in Iowa. The rainiest season is Summer when it rains 29% of the time and the driest is Spring with only a 20% chance of a rainy day.

An annual snowfall of 4.6 inches in Seattle means that it is about average compared to other places in Washington.

An annual snowfall of 33.9 inches in Waterloo means that it is snowier than most places in Iowa.

December is the snowiest month in Seattle with 2.1 inches of snow, and 4 months of the year have significant snowfall.

December is the snowiest month in Waterloo with 9.6 inches of snow, and 6 months of the year have significant snowfall.