Saint Helens weather in September (Oregon, United States of America)

How does the September weather in Saint Helens compare to other months? This guide provides the necessary weather information for your travel plans.

Temperatures

Expect perfect weather in Saint Helens during September, which means high temperatures and moderate rainfall. During September, you’ll experience the summer season. Daytime temperatures are expected to be around 25°C, cooling off to about 10°C at night.

Precipitation

Saint Helens in September usually receives moderate rainfall, averaging around 42 mm for the month. Looking at the last 30 years, the data shows about 9 days with rain.

Average sunshine

With approximately 236 hours hours of sun, the days are filled with brightness. It makes it a perfect month for outdoor activities.

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

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

 

Saint Helens, monthly averages in September

Min Temperature 10°C  

Max Temperature 25°C  

Chance of Rain 30%  

Precipitation 42 mm  

Rainy days 9 days  

Humidity 69% *  

Sunshine 236 hours *  

Percentage Sunshine *  

Data from: Portland, the United States of America (33 KM, 20 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 Saint Helens, 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.

Swimming

10/10

Cycling

10/10

Walking

10/10

Barbeque

9/10

Camping

10/10

Outdoor sports

10/10

Interested in more climate information?

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

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.