Leavenworth

Washington State Weather in August

Average temperatures, rainfall, sunshine and the best places to visit in Washington State, the United States of America in August.

Considering a trip to Washington State, the United States of America this August and wondering about the expected weather conditions? Find all the crucial information you need right here, addressing your question:

What to Expect in Washington State in August

Washington State, the United States of America is a region in the United States of America. In August, Washington State experiences a range of weather conditions, with temperatures that range from cold to very warm and precipitation levels ranging from almost none to moderate. During August, summer is in full swing.

Temperatures

During the day temperatures vary from cold in Mount Rainier National Park at 11°C (52°F) to very warm in Pasco at 32°C (90°F). At night it cools down to 15°C (59°F) in Pasco and -1°C (30°F) in Mount Rainier National Park . In Washington State, the United States of America, August typically stands out as the hottest month of the year. If you're planning a visit during this time, it would be wise to come prepared. Packing light and breathable summer cloths will ensure you stay comfortable throughout your stay.

For a closer look at conditions across Washington State, the United States of America, refer to the map below.

Precipitation

In August, precipitation varies across different areas. From almost no rainfall in Richland with an average of 2.6 mm (0.1 in) to moderate rainfall in North Cascades National Park with 71 mm (2.8 in).

Average sunshine

Plenty of sunshine can be expected in numerous places in August. Seattle typically receives 280 hours of sunlight, making it ideal for those seeking sunny weather.

Explore Washington State by month

Pick a month to see the average temperature, rainfall and sunshine in Washington State — and find the best time to visit. (based on Seattle)

Best Places to Visit in Washington State in August

Click on a destination dot for more details. Toggle the map to compare temperatures or precipitation across Washington State.

perfect weather
pleasant
tolerable
unpleasant
poor

Perfect weather is subjective. On this map perfect weather has been defined with temperatures between 20°C (68°F) and 29°C (84°F) and not too much precipitation (less than 90 mm (3.5 in) a month).

Popular Destinations in Washington State

What is the weather like in August for some of the most popular destinations in Washington State, the United States of America?

Temperature range in Washington State (August)

Precipitation variation in Washington State (August)

Seattle

In August Seattle generally has high temperatures with maximum daytime temperatures around 25°C (77°F), minimum nighttime temperatures around 14°C (57°F) and low monthly rainfall. So on average the conditions are perfect that month.

July
August
September
Max temperature
25°C (77°F)
25°C (77°F)
22°C (72°F)
Min temperature
14°C (57°F)
14°C (57°F)
12°C (54°F)
Monthly sun hours
312 hours
280 hours
220 hours
Monthly rainfall
14 mm (0.6 in)
23 mm (0.9 in)
49 mm (1.9 in)
Monthly rainy days
4 days
4 days
9 days
Weather conditions

SeaTac

In August SeaTac generally has high temperatures with maximum daytime temperatures around 25°C (77°F), minimum nighttime temperatures around 14°C (57°F) and low monthly rainfall. So on average the conditions are perfect that month.

July
August
September
Max temperature
25°C (77°F)
25°C (77°F)
22°C (72°F)
Min temperature
14°C (57°F)
14°C (57°F)
12°C (54°F)
Monthly sun hours
312 hours
280 hours
220 hours
Monthly rainfall
14 mm (0.6 in)
22 mm (0.9 in)
49 mm (1.9 in)
Monthly rainy days
4 days
4 days
9 days
Weather conditions

Ocean Shores

In August Ocean Shores generally has pleasant temperatures with maximum daytime temperatures around 19°C (66°F), minimum nighttime temperatures around 12°C (54°F) and moderate monthly rainfall. So on average the conditions are pleasant that month.

July
August
September
Max temperature
19°C (66°F)
19°C (66°F)
19°C (66°F)
Min temperature
12°C (54°F)
12°C (54°F)
11°C (52°F)
Monthly rainfall
26 mm (1 in)
34 mm (1.3 in)
80 mm (3.1 in)
Monthly rainy days
9 days
9 days
13 days
Weather conditions

Bellevue

In August Bellevue generally has high temperatures with maximum daytime temperatures around 25°C (77°F), minimum nighttime temperatures around 14°C (57°F) and low monthly rainfall. So on average the conditions are perfect that month.

July
August
September
Max temperature
25°C (77°F)
25°C (77°F)
22°C (72°F)
Min temperature
13°C (55°F)
14°C (57°F)
11°C (52°F)
Monthly sun hours
312 hours
280 hours
220 hours
Monthly rainfall
17 mm (0.7 in)
28 mm (1.1 in)
56 mm (2.2 in)
Monthly rainy days
5 days
6 days
10 days
Weather conditions

Vancouver

In August Vancouver generally has high temperatures with maximum daytime temperatures around 27°C (81°F), minimum nighttime temperatures around 14°C (57°F) and low monthly rainfall. So on average the conditions are perfect that month.

July
August
September
Max temperature
27°C (81°F)
27°C (81°F)
24°C (75°F)
Min temperature
13°C (55°F)
14°C (57°F)
11°C (52°F)
Monthly sun hours
332 hours
298 hours
236 hours
Monthly rainfall
14 mm (0.6 in)
12 mm (0.5 in)
41 mm (1.6 in)
Monthly rainy days
5 days
4 days
9 days
Weather conditions

Is your destination not in the list? Have a look at all destinations in Washington State, in the United States of America.

Popular cities in August

Day & night temperatures, rainfall and average weather in Washington State in August.

City Weather Day temp Night temp Rainfall
Seattle 25°C (77°F) 14°C (57°F) 23 mm (0.9 in)
SeaTac 25°C (77°F) 14°C (57°F) 22 mm (0.9 in)
Ocean Shores 19°C (66°F) 12°C (54°F) 34 mm (1.3 in)
Bellevue 25°C (77°F) 14°C (57°F) 28 mm (1.1 in)
Vancouver 27°C (81°F) 14°C (57°F) 12 mm (0.5 in)
Leavenworth 30°C (86°F) 13°C (55°F) 7.3 mm (0.3 in)

Washington State weather in August: frequently asked questions

What is the weather like in Washington State, the United States of America in August?

August in Washington State, the United States of America brings perfect weather. In Seattle, daytime temperatures are typically around 25°C (77°F) and nighttime lows hover near 14°C (57°F).

What is the average temperature in Washington State, the United States of America in August?

In Seattle, the average daytime high in August is 25°C (77°F), while nighttime temperatures drop to around 14°C (57°F).

Does Washington State, the United States of America get a lot of rain in August?

August is on the drier side in Washington State, the United States of America. Seattle averages only about 23 mm (0.9 in), with most days staying dry.

Is August a Good Time to Visit Washington State, the United States of America?

We consider August to be one of the best times to travel to Washington State, the United States of America. Typically, the climate in Seattle is perfect. However, the weather conditions may vary depending on your destination.

Generally speaking, June, July, August and September provide perfect weather in Seattle. On the other hand, the months of January, February, March, November and December tend to have poor weather conditions.

Interested in more climate information?

We have much more information about the climate in Washington State.

Weather and climate has detailed information for every country in the world. Are you going to the United States of America? Get detailed historical weather averages for many cities in the United States of America.

Not sure yet where to go? We now have a tool which recommends destinations that suit your ideal travel conditions. Find out where to go with our weather planner.

Bucket list

Need travel inspiration? Check out our bucket list articles and be inspired.