Temperatures in August
It's warm in August in SeaTac with an average temperature of 26°C. Temperatures this month range from a low of 22°C to a high of 29°C. At night, you can expect temperatures between 14°C and 17°C.
Max and Min Temperatures per Day
This chart shows the daily maximum and minimum temperatures in degrees Celsius for SeaTac in August. The red line indicates the max temperatures, and the blue line shows the minimums.
Start of August
The month of August starts in SeaTac with hot temperatures, averaging around 28°C during the day and nights close to 17°C. There’s little chance of precipitation. The weather is mostly sunny and dry.
Since temperatures can differ between day and night, it’s a good idea to dress in layers.
Mid-August
By mid-August, the average daytime temperature drops to around 27°C, with nights close to 17°C. Not much precipitation expected during this period. It’s mostly dry with sunshine.
Temperatures vary between day and night, so it’s smart to wear layers.
End of August
By the end of August, the average daytime temperature in SeaTac will be around 25°C, with nights close to 15°C. Barely any chance of precipitation. The weather will mostly be dry with lots of sunshine.
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Precipitation in August
In August, there is an average of 20 mm of precipitation, spread over 3 days. The wind speed is around 3 Bft, mostly coming from the West.
The average chance of precipitation is only 9% in August.
Precipitation Chance
This chart shows the daily precipitation chance (in percentages) in August for SeaTac. 0% means it never rained on that day in the past 10 years, and 100% means it rained every day. All values in between represent the average chance of precipitation on that day.
SeaTac in August |
London | ||
|---|---|---|---|
 Average Temperature |
26°C | 22°C | |
 High Temp |
29°C | 24°C | |
| Low Temp |
22°C | 19°C | |
 Total Precipitation |
20 mm | 60 mm | |
| Rainy Days |
3 days | 10 days | |
July
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 SeaTac?
Want nice weather? Then August is a great time to be in SeaTac. You’ll have pleasant temperatures and little chance of rain this month.
Temperature records for SeaTac in August
With 37°C, SeaTac hit the highest temperature in the last 10 years in August 2020. The lowest daytime temperature in this month was 17°C in 2021. The extreme night temperatures ranged from a low of 10°C to a high of 22°C.
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Daily Temperature in August in SeaTac
This chart shows the average daily temperatures, both day and night, for each day in August in SeaTac, measured in degrees Celsius. The red line represents the maximum temperatures, while the blue line shows the minimums. The days of the month are displayed at the bottom of the chart. The data, based on historical observations, gives an overview of the average daily temperatures during this month.
Daily Precipitation in August in SeaTac
The chart below shows the average daily precipitation in August for SeaTac, measured in millimetres over the past years. Precipitation is always measured as water, even if it’s snow or hail. The days of the month are shown 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 rain is more likely. But it’s still an average, so each day can be different. Based on historical weather data for August, you can expect around 3 days of rain in SeaTac.
Daily UV Index in August in SeaTac
This chart shows the average daily UV index in August in SeaTac, 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.
Temperature in August in SeaTac Over the Years
This chart shows the average temperature in August in SeaTac, measured in degrees Celsius, over the past years.
Total Precipitation in August in SeaTac Over the Years
This chart shows the average precipitation in August in SeaTac, measured in millimetres over the past years. Precipitation is always measured as water, even if it’s snow or hail.
Daily climate in August for SeaTac
Click on a specific day in August for detailed info on the typical weather on that day in SeaTac. Check out the historical temperatures and precipitation over the past 10 years on this day.
Weather experiences in August in SeaTac
Have you been to SeaTac in August?
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Average Weather in SeaTac by Month
Click on a month below to see detailed weather info for SeaTac. Based on historical weather data, you can see the average temperature, precipitation, wind, and UV index for each day of the month.
