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Normal weather for Seattle in August

It's warm in August in Seattle with an average temperature of 26°C. Temperatures this month range from a low of 23°C to a high of 28°C. At night, you can expect temperatures between 15°C and 18°C.

In August, there is an average of 11 mm of precipitation, spread over 3 days. The wind speed is around 3 Bft, mostly coming from the West.

Seattle in August

New York
Temperature Average Temperature
26°C 30°C
Sun High Temp
28°C 31°C
Sun Low Temp
23°C 28°C
Rain Total Precipitation
11 mm 79 mm
Rain Rainy Days
3 days 13 days

Start of August

The month of August starts in Seattle with hot temps, averaging around 28°C during the day and nights around 17°C. There’s little chance of precipitation. The weather’s mostly sunny and dry.

With the temperature difference between day and night, it’s smart to wear layers. For the daytime, light clothing like shorts or a dress, and a hat and sunglasses are perfect. For the evening and morning, a shirt, maybe a light sweater, and thin pants are recommended.

Mid August

By mid-August, daytime temps drop to around 27°C, with nights around 17°C. Not much precipitation expected during this period. It’s mostly dry and sunny.

Since it cools down at night, it’s a good idea to wear layers. For the daytime, light clothing like shorts or a dress, and a hat and sunglasses are perfect. For the evening and morning, a shirt, maybe a light sweater, and thin pants are recommended.

End of August

By the end of August, the average daytime temperature in Seattle is around 26°C, while nighttime temps are about 16°C. There’s hardly any chance of precipitation. The weather will be mostly dry with plenty of sun.

Because temperatures drop in the evening, wearing layers is recommended. For the daytime, light clothing like shorts or a dress, and a hat and sunglasses are perfect. For the evening and morning, a shirt, maybe a light sweater, and thin pants are recommended.

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Water temperature

The water temperature at Seattle is 20°C this month. Refreshing if you feel like a swim.

UV index

The UV index is a maximum of 8 this month. That's a very high value on the intensity scale of 1 to 11. Unprotected skin can burn within 10-15 minutes.

Is August a good time to visit Seattle?

Looking for great weather? August is a good time to be in Seattle. The temperatures are nice, and there’s little chance of rain this month.

Temperature records for Seattle in August

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Daily Temperature in August in Seattle

This chart shows the average daily high and low temperatures in August for Seattle, in degrees Celsius. The red line represents the highs, and the blue line shows the lows. The days of the month are displayed at the bottom of the chart. The data, based on historical observations, provide the average temperatures for this month.

Daily Temperature in August in Seattle

Daily Precipitation in August in Seattle

The chart below shows the average daily precipitation in August for Seattle, measured in millimeters over the past few years. Precipitation is always measured as water, even if it’s snow or hail. The days of the month are listed at the bottom of the chart.

A low average precipitation means that the chance of rain on that day is usually small, while a higher average suggests that it rained more often. But remember, it’s just an average, and every day can be different. Based on historical weather data for August, you can expect about 3 days of precipitation in Seattle.

Daily Precipitation in August in Seattle

Daily UV Index in August in Seattle

This chart shows the average daily UV index in August in Seattle, with the UV index ranging from 0 to a maximum of 11. The bottom of the chart shows the days of the month. Based on historical data, this chart provides an idea of the daily UV radiation levels you can expect.

Daily UV Index in August in Seattle

Temperature in August in Seattle Over the Years

This chart shows the average temperature in August in Seattle, measured in degrees Celsius, over the past few years.

Temperature in August in Seattle Over the Years

Total Precipitation in August in Seattle Over the Years

This chart shows the average precipitation in August in Seattle, measured in millimeters over the past years. Precipitation is always measured as water, whether it’s snow or hail.

Precipitation in August in Seattle Over the Years

Daily Climate in August for Seattle

Click on any day in August to get detailed info about the usual weather on that day in Seattle. Check out the historical temperatures and precipitation over the past 10 years on this day.

Weather experiences in August in Seattle

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Average Weather in Seattle by Month

Click on a month below to see detailed weather info for Seattle. Based on historical weather data, you can see the average temperature, precipitation, wind, and UV index for each day of the month.


Or check out the climate of Seattle for all months at once

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