Issaquah weather in September (Washington State, United States of America)

How is September weather typically in Issaquah? Get all the weather information you need to plan your visit.

Temperatures

During September, Issaquah experiences perfect weather, with pleasant temperatures and moderate rainfall. The summer season is characteristic of September. Anticipate daytime temperatures around 21°C, while night temperatures can drop to 11°C.

Precipitation

Issaquah in September usually receives moderate rainfall, averaging around 82 mm for the month. Records from the past 30 years suggest that around 12 days will experience rain.

Average sunshine

Enjoy a sunny month with about 220 hours of sunshine, providing a cheerful and lively atmosphere.

If you're inclined towards comfortable temperatures and drier conditions, September is a prime time to visit Issaquah. June, July, August and September typically offer the best circumstances. While January, February, March, April, November and December tend to showcase less optimal conditions.

For an in-depth look at the yearly conditions, visit our specialized Issaquah climate page with graphs.

 

Issaquah, monthly averages in September

Min Temperature 11°C  

Max Temperature 21°C  

Chance of Rain 40%  

Precipitation 82 mm  

Rainy days 12 days  

Humidity 73% *  

Windspeed 14 km/h *  

Sunshine 220 hours *  

Percentage Sunshine 59% *  

Data from: Seattle, the United States of America (21 KM, 13 Miles).

Where to go in the United States of America in September

Find out more about the weather in the United States of America and which places have the best travel conditions in this month.

Weather conditions Weather

Temperatures

Precipitation

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Legend perfect weather pleasant tolerable unpleasant poor

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

So, what should you wear in this month?

For visitors traveling to Issaquah, we recommend wearing layers. So maybe a skirt, t-shirt, shorts for during the day and jeans and a warm jacket for some days and evenings. Bring a rain jacket in case it rains during your stay. Plan on layering your clothes.

What To Do

We rated the following activities from 1 (least suitable) to 10 (best) to do.

Cycling

9/10

Walking

9/10

Barbeque

8/10

Camping

8/10

Outdoor sports

9/10

Interested in more climate information?

This site provides you with all the information you need about the climate in Issaquah.

Our site offers climate and forecast data for every country in the world. Are you going to the United States of America? On this website you can find 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.