Hottest (avg)
#1 / 12
Seattle in August
August weather, climate averages, and packing tips.
Avg High
Avg Low
Rain
Daylight 14h
What to expect
As summer continues, August brings, where conditions remain fairly consistent. Daytime highs average 24°C / 75°F, dropping to 14°C / 57°F at night.
You can expect a mix of sun and cloud, with about 7 days seeing some rain.
Statistically, this is the hottest month of the year.
August in context
How it compares to the rest of the year in Seattle.
Wettest (avg)
#2 / 12
Daylight Hours
#4 / 12
Windiest (avg)
#12 / 12
Highest UV
#4 / 12
Most Humid
#11 / 12
Temperature
- Daytime high
-
- Nighttime low
-
- Feels like (avg)
-
Sunshine
- Daylight
- 14.2 hours
- UV index (max)
- 7
- Typical sun hours
- 05:06 – 19:18
Rain & Snow
- Total
-
- Rainy days
- 7
- Cloud cover
- 45%
- Snowfall
-
Humidity & Wind
- Humidity (avg)
- 69%
- Wind (avg)
-
- Wind (max gusts)
-
Frequently asked questions
Is August a good time to visit Seattle?
Typical August days in Seattle reach highs of 24°C (75°F) with nights around 14°C (57°F). It usually feels warm by day and cool after dark. It is one of the drier months, which suits outdoor exploring and sightseeing.
What are temperatures like in August?
In August, you can usually expect highs of 24°C (75°F) and lows near 14°C (57°F). That means warm days and cool nights, so pack layers you can add or remove.
How much does it rain in August?
Rainfall in August averages 33 mm (1.3 in) across roughly 7 days. Overall it is a moderately wet time of year, so showers are usually brief rather than all-day downpours.
How many hours of daylight are there in August?
You can expect about 14 hours of daylight in August. Sunrise is typically around 05:06 and sunset near 19:18. You get long days with comfortable amounts of daylight.
Does the weather change during August?
August usually begins milder and cools down as the month goes on, so late-August can feel more like the next month.
How strong is the sun in August?
UV levels are often high (around 7). Regular sunscreen and a hat are recommended.
Is it windy in August?
In August, average wind speeds are around 8 km/h (5 mph), with gusts on the windiest days reaching about 40 km/h (25 mph). On the ground, it is it often feels breezy, especially in more exposed spots or along the coast.