2025 Compare Climate & Weather:
Union City, CA vs Cupertino, CA

Highlights

On average, there are 265 sunny days per year in Cupertino. Union City averages 265 sunny days per year. The US average is 205 sunny days.

Cupertino, California gets 18 inches of rain, on average, per year. Union City, California gets 16.6 inches of rain, on average, per year. The US average is 38.1 inches of rain per year.

Cupertino averages 0 inches of snow per year. Union City averages 0 inches of snow per year. The US average is 27.8 inches of snow per year.

Weather Highlights

Cupertino, California
Summer High: the July high is around 81.2 degrees
Winter Low: the January low is 41.2
Rain: averages 18 inches of rain a year
Snow: averages 0 inches of snow a year

Union City, California
Summer High: the July high is around 76.1 degrees
Winter Low: the January low is 42.3
Rain: averages 16.6 inches of rain a year
Snow: averages 0 inches of snow a year

BestPlaces Comfort Index

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

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

Today's Weather - Union City, CA

57°F

Today's Weather - Cupertino, CA

58°F

Average Monthly High / Low (°F)

Hot, Freezing, Rainy, Snowy Days: Union City / Cupertino

August is the hottest month for Union City with an average high temperature of 77.3°, which ranks it as cooler than most places in California. In Union City, there are 6 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Union City are August, September and July.

July is the hottest month for Cupertino with an average high temperature of 81.2°, which ranks it as cooler than most places in California. In Cupertino, there are 6 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Cupertino are June, September and August.

January has the coldest nighttime temperatures for Union City with an average of 42.3°. This is warmer than most places in California.

January has the coldest nighttime temperatures for Cupertino with an average of 41.2°. This is warmer than most places in California.

In Union City, there are 7.8 days annually when the high temperature is over 90°, which is cooler than most places in California.

In Cupertino, there are 16.2 days annually when the high temperature is over 90°, which is cooler than most places in California.

In Union City, there are 1.6 days annually when the nighttime low temperature falls below freezing, which is warmer than most places in California.

In Cupertino, there are 5.5 days annually when the nighttime low temperature falls below freezing, which is warmer than most places in California.

In Union 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.

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

February is the wettest month in Union City with 3.2 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 16.6 inches in Union City means that it is about average compared to other places in California.


February is the wettest month in Cupertino with 3.7 inches of rain, and the driest month is July with 0.0 inches. The wettest season is Spring with 58% of yearly precipitation and 1% occurs in Autumn, which is the driest season. The annual rainfall of 18.0 inches in Cupertino means that it is about average compared to other places in California.

December is the rainiest month in Union City with 11.4 days of rain, and July is the driest month with only 0.1 rainy days. There are 64.1 rainy days annually in Union City, which is rainier than most places in California. The rainiest season is Spring when it rains 51% of the time and the driest is Autumn with only a 2% chance of a rainy day.

December is the rainiest month in Cupertino with 10.3 days of rain, and July is the driest month with only 0.2 rainy days. There are 61.4 rainy days annually in Cupertino, 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.

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

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

Any measurable snowfall is a rare occurance in Union City.

Any measurable snowfall is a rare occurance in Cupertino.