2025 Compare Climate & Weather:
Sammamish, WA vs Roseville, CA

Highlights

On average, there are 247 sunny days per year in Roseville. Sammamish averages 155 sunny days per year. The US average is 205 sunny days.

Roseville, California gets 21.2 inches of rain, on average, per year. Sammamish, Washington gets 52.7 inches of rain, on average, per year. The US average is 38.1 inches of rain per year.

Roseville averages 0 inches of snow per year. Sammamish averages 6.3 inches of snow per year. The US average is 27.8 inches of snow per year.

Weather Highlights

Roseville, California
Summer High: the July high is around 94 degrees
Winter Low: the January low is 39
Rain: averages 21.2 inches of rain a year
Snow: averages 0 inches of snow a year

Sammamish, Washington
Summer High: the July high is around 75.4 degrees
Winter Low: the January low is 35.3
Rain: averages 52.7 inches of rain a year
Snow: averages 6.3 inches of snow a year

BestPlaces Comfort Index

The annual BestPlaces Comfort Index for Roseville is 8.2 (10=best), which means it is about average compared to other places in California.

The annual BestPlaces Comfort Index for Sammamish is 7.1 (10=best), which means it is about average compared to other places in Washington.

Today's Weather - Sammamish, WA

60°F

Today's Weather - Roseville, CA

81°F

Average Monthly High / Low (°F)

Hot, Freezing, Rainy, Snowy Days: Sammamish / Roseville

August is the hottest month for Sammamish with an average high temperature of 76.0°, which ranks it as cooler than most places in Washington. In Sammamish, there are 3 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Sammamish are August, July and September.

July is the hottest month for Roseville with an average high temperature of 94.0°, which ranks it as warmer than most places in California. In Roseville, there are 3 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Roseville are October, May and April.

December has the coldest nighttime temperatures for Sammamish with an average of 33.9°. This is warmer than most places in Washington.

December has the coldest nighttime temperatures for Roseville with an average of 38.9°. This is warmer than most places in California.

In Sammamish, there are 3.1 days annually when the high temperature is over 90°, which is about average compared to other places in Washington.

In Roseville, there are 77.5 days annually when the high temperature is over 90°, which is hotter than most places in California.

In Sammamish, there are 42.9 days annually when the nighttime low temperature falls below freezing, which is warmer than most places in Washington.

In Roseville, there are 10.7 days annually when the nighttime low temperature falls below freezing, which is warmer than most places in California.

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

November is the wettest month in Sammamish with 8.6 inches of rain, and the driest month is July with 1.2 inches. The wettest season is Spring with 36% of yearly precipitation and 10% occurs in Autumn, which is the driest season. The annual rainfall of 52.7 inches in Sammamish means that it is wetter than most places in Washington.


February is the wettest month in Roseville with 4.0 inches of rain, and the driest month is July with 0.0 inches. The wettest season is Spring with 55% of yearly precipitation and 1% occurs in Autumn, which is the driest season. The annual rainfall of 21.2 inches in Roseville means that it is wetter than most places in California.

November is the rainiest month in Sammamish with 20.4 days of rain, and August is the driest month with only 5.7 rainy days. There are 173.5 rainy days annually in Sammamish, which is rainier than most places in Washington. The rainiest season is Spring when it rains 31% of the time and the driest is Autumn with only a 14% chance of a rainy day.

January is the rainiest month in Roseville with 10.6 days of rain, and July is the driest month with only 0.1 rainy days. There are 60.2 rainy days annually in Roseville, which is about average compared to other places in California. The rainiest season is Spring when it rains 50% of the time and the driest is Autumn with only a 3% chance of a rainy day.

An annual snowfall of 6.3 inches in Sammamish means that it is about average compared to other places in Washington.

There is rarely any recorded snowfall in Roseville, ranking it as one of the least snowy places in California.

December is the snowiest month in Sammamish with 2.0 inches of snow, and 5 months of the year have significant snowfall.

Any measurable snowfall is a rare occurance in Roseville.