Saint Helens Weather in September

September in Saint Helens brings high temperatures, with daytime highs of 25°C (77°F) and nights around 10°C (50°F). The perfect weather makes it a solid choice for a visit.

Rainfall in Saint Helens in September

Records from the past 30 years suggest around 9 days of rain, with 42 mm (1.7 in) average for the month. The rainfall pattern this month is fairly balanced. Showers tend to be moderate rather than extreme.

Temperature in Saint Helens in September

The perfect temperature in Saint Helens in September makes it a solid month to visit, with 25°C (77°F) during the day and 10°C (50°F) at night. September is a notable month of the summer season. Overall, the month follows a fairly predictable daily temperature pattern. With overnight lows of 10°C (50°F), evenings can feel noticeably cooler than the daytime. An extra layer is a good idea, though the cool air makes for a good night's sleep.

Sunshine in Saint Helens in September

Enjoy a sunny month with about 236 hours of sunshine, the clear skies make Saint Helens even more beautiful.

If you're inclined towards comfortable temperatures and drier conditions, September is a good time to visit Saint Helens.

Select a Month

Check the conditions for any month of the year.

• January
• February
• March
• April

• May
• June
• July
• August

• September
• October
• November
• December

For a detailed overview over the year and the best time to visit the United States of America, check out our Saint Helens's climate page.

Saint Helens Temperature in September

Min Temperature 10°C (50°F)  

Max Temperature 25°C (77°F)  

Chance of Rain 30%  

Precipitation 42 mm (1.7 in)  

Rainy days 9 days  

Humidity 69% *  

Sunshine 236 hours *  

Percentage Sunshine *  

* Data from: Portland, the United States of America (33 KM, 20 Miles).

What to Wear in Saint Helens in September

Pleasant temperatures in September mean you can pack light but flexibel pieces. Think cotton t-shirts, comfortable walking shorts, and one warmer layer for evenings. A light sweater or denim jacket works well. Rain gear is recommended, you can expect wet weather on multiple days. Don't forget sun protection, sunglasses, sunscreen, and a hat. These are all good ideas with this much sunshine.

What To Do in Saint Helens in September

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

Select a Month

Check the conditions for any month of the year.

• January
• February
• March
• April

• May
• June
• July
• August

• September
• October
• November
• December

For a detailed overview over the year and the best time to visit the United States of America, check out our Saint Helens's climate page.

More climate data for Saint Helens

Temperature Rainfall Sunshine Humidity

See the full Saint Helens climate overview or explore weather in the United States of America.