2024 Compare Climate & Weather:
Seattle, WA vs Ontario, CA
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Highlights
On average, there are 279 sunny days per year in Ontario. Seattle averages 152 sunny days per year. The US average is 205 sunny days.
Ontario, California gets 15.7 inches of rain, on average, per year. Seattle, Washington gets 38 inches of rain, on average, per year. The US average is 38.1 inches of rain per year.
Ontario averages 0 inches of snow per year. Seattle averages 4.6 inches of snow per year. The US average is 27.8 inches of snow per year.
Weather Highlights
Ontario, California
Summer High: the July high is around 91.9 degrees
Winter Low: the January low is 42.6
Rain: averages 15.7 inches of rain a year
Snow: averages 0 inches of snow a year
Seattle, Washington
Summer High: the July high is around 75.8 degrees
Winter Low: the January low is 37
Rain: averages 38 inches of rain a year
Snow: averages 4.6 inches of snow a year
BESTPLACES COMFORT INDEX
OntarioThe annual BestPlaces Comfort Index for Ontario is 8.8 (10=best), which means it is more comfortable than most places in California.
8.8 / 10
May, June and October are the most pleasant months in Ontario, while August and July are the least comfortable months.
SeattleThe annual BestPlaces Comfort Index for Seattle is 7.5 (10=best), which means it is one of the most pleasant places in Washington.
7.5 / 10
August, July and September are the most pleasant months in Seattle, while December and January are the least comfortable months.
Today's Weather - Seattle, WA
3 PM PST
Sunny
61°F
| DAY | DESCRIPTION | HIGH / LOW | WIND |
|---|
| This Afternoon | Sunny | 63° / 44° | N 6 to 9 mph |
| Friday | Mostly Cloudy then Chance Light Rain | 66° / 49° | SSW 3 to 9 mph |
| Saturday | Light Rain Likely | 52° / 46° | SW 8 mph |
| Sunday | Light Rain Likely | 53° / 47° | S 9 to 16 mph |
| Monday | Showers And Thunderstorms | 56° / 43° | SW 15 mph |
| Tuesday | Light Rain Likely | 57° / 43° | SW 9 mph |
| Wednesday | Slight Chance Light Rain | 58° / 44° | W 9 mph |
Average Monthly High / Low (°F)
| Month | Seattle, WA | Ontario, CA |
|---|
| January | 48° / 37° | 67° / 43° |
| February | 51° / 37° | 67° / 44° |
| March | 54° / 40° | 70° / 46° |
| April | 59° / 43° | 75° / 49° |
| May | 65° / 48° | 79° / 54° |
| June | 70° / 53° | 85° / 58° |
| July | 76° / 57° | 92° / 62° |
| August | 76° / 57° | 93° / 63° |
| September | 71° / 53° | 90° / 60° |
| October | 60° / 46° | 81° / 54° |
| November | 52° / 40° | 73° / 46° |
| December | 46° / 36° | 67° / 41° |
Hot, Freezing, Rainy, Snowy Days: Seattle / Ontario
| Month | Hot Days | Freezing Days | Rainy Days | Snowy Days |
|---|
| January | 0 / 0 | 6 / 1 | 18 / 5 | 1 / 0 |
| February | 0 / 0 | 5 / 0 | 15 / 6 | 1 / 0 |
| March | 0 / 0 | 2 / 0 | 17 / 5 | 0 / 0 |
| April | 0 / 2 | 0 / 0 | 15 / 3 | 0 / 0 |
| May | 0 / 4 | 0 / 0 | 12 / 1 | 0 / 0 |
| June | 0 / 8 | 0 / 0 | 10 / 1 | 0 / 0 |
| July | 1 / 20 | 0 / 0 | 6 / 0 | 0 / 0 |
| August | 0 / 22 | 0 / 0 | 5 / 0 | 0 / 0 |
| September | 0 / 16 | 0 / 0 | 8 / 1 | 0 / 0 |
| October | 0 / 6 | 0 / 0 | 13 / 2 | 0 / 0 |
| November | 0 / 1 | 3 / 0 | 19 / 3 | 0 / 0 |
| December | 0 / 0 | 7 / 2 | 18 / 4 | 1 / 0 |
August is the hottest month for Seattle with an average high temperature of 76.3°, which ranks it as cooler than most places in Washington. In Seattle, there are 4 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Seattle are August, July and September.
August is the hottest month for Ontario with an average high temperature of 93.4°, which ranks it as warmer than most places in California. In Ontario, there are 5 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Ontario are May, October and April.
December has the coldest nighttime temperatures for Seattle with an average of 35.9°. This is one of the warmest places in Washington.
December has the coldest nighttime temperatures for Ontario with an average of 41.4°. This is warmer than most places in California.
In Seattle, there are 1.7 days annually when the high temperature is over 90°, which is cooler than most places in Washington.
In Ontario, there are 79.5 days annually when the high temperature is over 90°, which is hotter than most places in California.
In Seattle, there are 24.0 days annually when the nighttime low temperature falls below freezing, which is one of the warmest places in Washington.
In Ontario, there are 3.6 days annually when the nighttime low temperature falls below freezing, which is warmer than most places in California.
In Seattle, there are 0.0 days annually when the nighttime low temperature falls below zero°, which is about average compared to other places in Washington.
In Ontario, there are 0.0 days annually when the nighttime low temperature falls below zero°, which is about average compared to other places in California.
November is the wettest month in Seattle with 6.2 inches of rain, and the driest month is July with 0.8 inches. The wettest season is Spring with 39% of yearly precipitation and 9% occurs in Autumn, which is the driest season. The annual rainfall of 38.0 inches in Seattle means that it is about average compared to other places in Washington.
February is the wettest month in Ontario with 3.8 inches of rain, and the driest month is July with 0.0 inches. The wettest season is Spring with 60% of yearly precipitation and 1% occurs in Autumn, which is the driest season. The annual rainfall of 15.7 inches in Ontario means that it is drier than most places in California.
November is the rainiest month in Seattle with 18.7 days of rain, and August is the driest month with only 5.3 rainy days. There are 155.3 rainy days annually in Seattle, which is about average compared to other places in Washington. The rainiest season is Spring when it rains 33% of the time and the driest is Autumn with only a 13% chance of a rainy day.
February is the rainiest month in Ontario with 5.7 days of rain, and July is the driest month with only 0.2 rainy days. There are 30.5 rainy days annually in Ontario, which is one of the least rainy places in California. The rainiest season is Spring when it rains 50% of the time and the driest is Autumn with only a 4% chance of a rainy day.
An annual snowfall of 4.6 inches in Seattle means that it is about average compared to other places in Washington.
There is rarely any recorded snowfall in Ontario, ranking it as one of the least snowy places in California.
December is the snowiest month in Seattle with 2.1 inches of snow, and 4 months of the year have significant snowfall.
Any measurable snowfall is a rare occurance in Ontario.
DID YOU KNOW?
Many people confuse Weather and Climate, but they are different. Weather refers to the conditions of the atmosphere over a short period of time, while Climate refers to the conditions of the atmosphere over a long period of time.
Weather, more specifically, refers to how the atmosphere behaves and its effects on life and human activities. Most people think of Weather in terms of what can be observed: temperature, humidity, precipitation, and cloudy/sunny conditions. Weather conditions constantly change on a minute-to-minute basis.
Climate is a record of the average weather conditions for a given place over a long period of time, often referred to as Climate Normals. A 30-year period of record is a common requirement to be considered a Climate Normal.
Reviews for Seattle 
2 Reviews
Hi. I'd like to know if you still feel the same way about living in Broomfield. I went there this past July to check it out (along with Lafayette, Boulder (can't More
Apex is perfect for what you are looking for. It's close enough to Raleigh, Durham, Chapel Hill to find a job and Cary the next town over, is a little more expensive but More
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Reviews for Ontario 2 Reviews
Hi. I'd like to know if you still feel the same way about living in Broomfield. I went there this past July to check it out (along with Lafayette, Boulder (can't More
Apex is perfect for what you are looking for. It's close enough to Raleigh, Durham, Chapel Hill to find a job and Cary the next town over, is a little more expensive but More
Start Your Review of Ontario
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