2025 Compare Climate & Weather:
Discovery Bay, CA vs Portola, CA

Highlights

On average, there are 243 sunny days per year in Portola. Discovery Bay averages 259 sunny days per year. The US average is 205 sunny days.

Portola, California gets 17.6 inches of rain, on average, per year. Discovery Bay, California gets 14.5 inches of rain, on average, per year. The US average is 38.1 inches of rain per year.

Portola averages 37.6 inches of snow per year. Discovery Bay averages 0 inches of snow per year. The US average is 27.8 inches of snow per year.

Weather Highlights

Portola, California
Summer High: the July high is around 84.8 degrees
Winter Low: the January low is 18.1
Rain: averages 17.6 inches of rain a year
Snow: averages 37.6 inches of snow a year

Discovery Bay, California
Summer High: the July high is around 92.5 degrees
Winter Low: the January low is 38.7
Rain: averages 14.5 inches of rain a year
Snow: averages 0 inches of snow a year

BestPlaces Comfort Index

The annual BestPlaces Comfort Index for Portola is 7.1 (10=best), which means it is one of the least comfortable places in California.

The annual BestPlaces Comfort Index for Discovery Bay is 8.4 (10=best), which means it is more comfortable than most places in California.

Today's Weather - Discovery Bay, CA

66°F

Today's Weather - Portola, CA

53°F

Average Monthly High / Low (°F)

Hot, Freezing, Rainy, Snowy Days: Discovery Bay / Portola

July is the hottest month for Discovery Bay with an average high temperature of 92.5°, which ranks it as about average compared to other places in California. In Discovery Bay, there are 3 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Discovery Bay are October, May and April.

July is the hottest month for Portola with an average high temperature of 84.8°, which ranks it as cooler than most places in California. In Portola, there are 4 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Portola are September, June and August.

January has the coldest nighttime temperatures for Discovery Bay with an average of 38.7°. This is warmer than most places in California.

January has the coldest nighttime temperatures for Portola with an average of 18.1°. This is one of the coldest places in California.

In Discovery Bay, there are 69.1 days annually when the high temperature is over 90°, which is about average compared to other places in California.

In Portola, there are 12.4 days annually when the high temperature is over 90°, which is cooler than most places in California.

In Discovery Bay, there are 12.0 days annually when the nighttime low temperature falls below freezing, which is warmer than most places in California.

In Portola, there are 198.8 days annually when the nighttime low temperature falls below freezing, which is one of the coldest places in California.

In Discovery Bay, 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 Portola, there are 3.9 days annually when the nighttime low temperature falls below zero°, which is one of the coldest places in California.

January is the wettest month in Discovery Bay with 2.8 inches of rain, and the driest month is July with 0.0 inches. The wettest season is Spring with 54% of yearly precipitation and 1% occurs in Autumn, which is the driest season. The annual rainfall of 14.5 inches in Discovery Bay means that it is drier than most places in California.


December is the wettest month in Portola with 3.0 inches of rain, and the driest month is July with 0.3 inches. The wettest season is Spring with 49% of yearly precipitation and 7% occurs in Autumn, which is the driest season. The annual rainfall of 17.6 inches in Portola means that it is about average compared to other places in California.

January is the rainiest month in Discovery Bay with 11.0 days of rain, and July is the driest month with only 0.1 rainy days. There are 56.1 rainy days annually in Discovery Bay, which is about average compared to other places in California. The rainiest season is Spring when it rains 53% of the time and the driest is Autumn with only a 2% chance of a rainy day.

March is the rainiest month in Portola with 7.8 days of rain, and July is the driest month with only 1.4 rainy days. There are 59.1 rainy days annually in Portola, which is about average compared to other places in California. The rainiest season is Spring when it rains 39% of the time and the driest is Autumn with only a 10% chance of a rainy day.

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

An annual snowfall of 37.6 inches in Portola means that it is one of the snowiest places in California.

Any measurable snowfall is a rare occurance in Discovery Bay.

February is the snowiest month in Portola with 8.8 inches of snow, and 6 months of the year have significant snowfall.