2025 Compare Climate & Weather:
Detroit, MI vs Foster City, CA

Highlights

On average, there are 262 sunny days per year in Foster City. Detroit averages 183 sunny days per year. The US average is 205 sunny days.

Foster City, California gets 19.1 inches of rain, on average, per year. Detroit, Michigan gets 33.5 inches of rain, on average, per year. The US average is 38.1 inches of rain per year.

Foster City averages 0 inches of snow per year. Detroit averages 33 inches of snow per year. The US average is 27.8 inches of snow per year.

Weather Highlights

Foster City, California
Summer High: the July high is around 77.9 degrees
Winter Low: the January low is 41.1
Rain: averages 19.1 inches of rain a year
Snow: averages 0 inches of snow a year

Detroit, Michigan
Summer High: the July high is around 83.5 degrees
Winter Low: the January low is 18.5
Rain: averages 33.5 inches of rain a year
Snow: averages 33 inches of snow a year

BestPlaces Comfort Index

The annual BestPlaces Comfort Index for Foster City is 8.7 (10=best), which means it is more comfortable than most places in California.

The annual BestPlaces Comfort Index for Detroit is 6.9 (10=best), which means it is one of the most pleasant places in Michigan.

Today's Weather - Detroit, MI

69°F

Today's Weather - Foster City, CA

58°F

Average Monthly High / Low (°F)

Hot, Freezing, Rainy, Snowy Days: Detroit / Foster City

July is the hottest month for Detroit with an average high temperature of 83.5°, which ranks it as one of the hottest places in Michigan. In Detroit, there are 4 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Detroit are June, August and September.

August is the hottest month for Foster City with an average high temperature of 77.9°, which ranks it as cooler than most places in California. In Foster City, there are 6 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Foster City are August, July and September.

January has the coldest nighttime temperatures for Detroit with an average of 18.5°. This is one of the warmest places in Michigan.

December has the coldest nighttime temperatures for Foster City with an average of 41.0°. This is warmer than most places in California.

In Detroit, there are 9.5 days annually when the high temperature is over 90°, which is one of the hottest places in Michigan.

In Foster City, there are 10.7 days annually when the high temperature is over 90°, which is cooler than most places in California.

In Detroit, there are 126.7 days annually when the nighttime low temperature falls below freezing, which is one of the warmest places in Michigan.

In Foster City, there are 6.1 days annually when the nighttime low temperature falls below freezing, which is warmer than most places in California.

In Detroit, there are 2.3 days annually when the nighttime low temperature falls below zero°, which is one of the warmest places in Michigan.

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

June is the wettest month in Detroit with 3.5 inches of rain, and the driest month is January with 1.8 inches. The wettest season is Autumn with 29% of yearly precipitation and 18% occurs in Spring, which is the driest season. The annual rainfall of 33.5 inches in Detroit means that it is about average compared to other places in Michigan.


February is the wettest month in Foster City with 3.8 inches of rain, and the driest month is July with 0.0 inches. The wettest season is Spring with 59% of yearly precipitation and 1% occurs in Autumn, which is the driest season. The annual rainfall of 19.1 inches in Foster City means that it is about average compared to other places in California.

December is the rainiest month in Detroit with 12.1 days of rain, and February is the driest month with only 9.0 rainy days. There are 125.2 rainy days annually in Detroit, which is less rainy than most places in Michigan. The rainiest season is Summer when it rains 26% of the time and the driest is Autumn with only a 24% chance of a rainy day.

January is the rainiest month in Foster City with 10.7 days of rain, and July is the driest month with only 0.1 rainy days. There are 62.0 rainy days annually in Foster City, which is rainier than most places in California. The rainiest season is Spring when it rains 50% of the time and the driest is Autumn with only a 2% chance of a rainy day.

An annual snowfall of 33.0 inches in Detroit means that it is one of the least snowy places in Michigan.

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

January is the snowiest month in Detroit with 10.2 inches of snow, and 6 months of the year have significant snowfall.

Any measurable snowfall is a rare occurance in Foster City.