2025 Compare Climate & Weather:
Sunnyvale, CA vs Bethesda, MD

Highlights

On average, there are 197 sunny days per year in Bethesda. Sunnyvale averages 260 sunny days per year. The US average is 205 sunny days.

Bethesda, Maryland gets 42.7 inches of rain, on average, per year. Sunnyvale, California gets 15.4 inches of rain, on average, per year. The US average is 38.1 inches of rain per year.

Bethesda averages 17.2 inches of snow per year. Sunnyvale averages 0 inches of snow per year. The US average is 27.8 inches of snow per year.

Weather Highlights

Bethesda, Maryland
Summer High: the July high is around 86.7 degrees
Winter Low: the January low is 25.3
Rain: averages 42.7 inches of rain a year
Snow: averages 17.2 inches of snow a year

Sunnyvale, California
Summer High: the July high is around 80.3 degrees
Winter Low: the January low is 42.3
Rain: averages 15.4 inches of rain a year
Snow: averages 0 inches of snow a year

BestPlaces Comfort Index

The annual BestPlaces Comfort Index for Bethesda is 7.3 (10=best), which means it is more comfortable than most places in Maryland.

The annual BestPlaces Comfort Index for Sunnyvale is 8.8 (10=best), which means it is more comfortable than most places in California.

Today's Weather - Sunnyvale, CA

56°F

Today's Weather - Bethesda, MD

64°F

Average Monthly High / Low (°F)

Hot, Freezing, Rainy, Snowy Days: Sunnyvale / Bethesda

August is the hottest month for Sunnyvale with an average high temperature of 80.3°, which ranks it as cooler than most places in California. In Sunnyvale, there are 6 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Sunnyvale are June, September and July.

July is the hottest month for Bethesda with an average high temperature of 86.7°, which ranks it as cooler than most places in Maryland. In Bethesda, there are 3 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Bethesda are September, May and June.

December has the coldest nighttime temperatures for Sunnyvale with an average of 42.2°. This is warmer than most places in California.

January has the coldest nighttime temperatures for Bethesda with an average of 25.3°. This is about average compared to other places in Maryland.

In Sunnyvale, there are 13.3 days annually when the high temperature is over 90°, which is cooler than most places in California.

In Bethesda, there are 23.8 days annually when the high temperature is over 90°, which is about average compared to other places in Maryland.

In Sunnyvale, there are 2.3 days annually when the nighttime low temperature falls below freezing, which is warmer than most places in California.

In Bethesda, there are 87.8 days annually when the nighttime low temperature falls below freezing, which is about average compared to other places in Maryland.

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

In Bethesda, there are 0.3 days annually when the nighttime low temperature falls below zero°, which is warmer than most places in Maryland.

February is the wettest month in Sunnyvale with 3.1 inches of rain, and the driest month is July with 0.0 inches. The wettest season is Spring with 56% of yearly precipitation and 1% occurs in Autumn, which is the driest season. The annual rainfall of 15.4 inches in Sunnyvale means that it is drier than most places in California.


May is the wettest month in Bethesda with 4.2 inches of rain, and the driest month is February with 2.8 inches. The wettest season is Summer with 27% of yearly precipitation and 21% occurs in Spring, which is the driest season. The annual rainfall of 42.7 inches in Bethesda means that it is drier than most places in Maryland.

December is the rainiest month in Sunnyvale with 10.5 days of rain, and July is the driest month with only 0.2 rainy days. There are 62.6 rainy days annually in Sunnyvale, which is rainier than most places in California. The rainiest season is Spring when it rains 49% of the time and the driest is Autumn with only a 2% chance of a rainy day.

May is the rainiest month in Bethesda with 11.6 days of rain, and August is the driest month with only 8.3 rainy days. There are 113.9 rainy days annually in Bethesda, which is about average compared to other places in Maryland. The rainiest season is Summer when it rains 28% of the time and the driest is Winter with only a 23% chance of a rainy day.

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

An annual snowfall of 17.2 inches in Bethesda means that it is snowier than most places in Maryland.

Any measurable snowfall is a rare occurance in Sunnyvale.

January is the snowiest month in Bethesda with 6.9 inches of snow, and 5 months of the year have significant snowfall.