2025 Compare Climate & Weather:
San Ramon, CA vs Lake Oswego, OR

Highlights

On average, there are 141 sunny days per year in Lake Oswego. San Ramon averages 256 sunny days per year. The US average is 205 sunny days.

Lake Oswego, Oregon gets 42 inches of rain, on average, per year. San Ramon, California gets 19 inches of rain, on average, per year. The US average is 38.1 inches of rain per year.

Lake Oswego averages 1.5 inches of snow per year. San Ramon averages 0 inches of snow per year. The US average is 27.8 inches of snow per year.

Weather Highlights

Lake Oswego, Oregon
Summer High: the July high is around 81.4 degrees
Winter Low: the January low is 36.6
Rain: averages 42 inches of rain a year
Snow: averages 1.5 inches of snow a year

San Ramon, California
Summer High: the July high is around 84.4 degrees
Winter Low: the January low is 39.2
Rain: averages 19 inches of rain a year
Snow: averages 0 inches of snow a year

BestPlaces Comfort Index

The annual BestPlaces Comfort Index for Lake Oswego is 7.6 (10=best), which means it is one of the most pleasant places in Oregon.

The annual BestPlaces Comfort Index for San Ramon is 8.5 (10=best), which means it is more comfortable than most places in California.

Today's Weather - San Ramon, CA

54°F

Today's Weather - Lake Oswego, OR

45°F

Average Monthly High / Low (°F)

Hot, Freezing, Rainy, Snowy Days: San Ramon / Lake Oswego

July is the hottest month for San Ramon with an average high temperature of 84.4°, which ranks it as cooler than most places in California. In San Ramon, there are 6 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for San Ramon are June, October and May.

August is the hottest month for Lake Oswego with an average high temperature of 82.0°, which ranks it as about average compared to other places in Oregon. In Lake Oswego, there are 4 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Lake Oswego are September, June and July.

January has the coldest nighttime temperatures for San Ramon with an average of 39.2°. This is warmer than most places in California.

December has the coldest nighttime temperatures for Lake Oswego with an average of 35.6°. This is warmer than most places in Oregon.

In San Ramon, there are 35.4 days annually when the high temperature is over 90°, which is cooler than most places in California.

In Lake Oswego, there are 14.3 days annually when the high temperature is over 90°, which is about average compared to other places in Oregon.

In San Ramon, there are 11.1 days annually when the nighttime low temperature falls below freezing, which is warmer than most places in California.

In Lake Oswego, there are 28.7 days annually when the nighttime low temperature falls below freezing, which is warmer than most places in Oregon.

In San Ramon, 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 Lake Oswego, there are 0.0 days annually when the nighttime low temperature falls below zero°, which is about average compared to other places in Oregon.

February is the wettest month in San Ramon with 3.5 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 19.0 inches in San Ramon means that it is about average compared to other places in California.


December is the wettest month in Lake Oswego with 6.8 inches of rain, and the driest month is July with 0.7 inches. The wettest season is Spring with 42% of yearly precipitation and 7% occurs in Autumn, which is the driest season. The annual rainfall of 42.0 inches in Lake Oswego means that it is about average compared to other places in Oregon.

December is the rainiest month in San Ramon with 10.9 days of rain, and July is the driest month with only 0.2 rainy days. There are 64.2 rainy days annually in San Ramon, 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.

November is the rainiest month in Lake Oswego with 18.7 days of rain, and August is the driest month with only 3.4 rainy days. There are 147.3 rainy days annually in Lake Oswego, which is about average compared to other places in Oregon. The rainiest season is Spring when it rains 35% of the time and the driest is Autumn with only a 11% chance of a rainy day.

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

An annual snowfall of 1.5 inches in Lake Oswego means that it is less snowy than most places in Oregon.

Any measurable snowfall is a rare occurance in San Ramon.

December is the snowiest month in Lake Oswego with 0.5 inches of snow, and 2 months of the year have significant snowfall.