Portland Weather in September

September in Portland brings very high temperatures around 32°C (90°F) during the day, dropping to 23°C (73°F) at night, with the most rainfall of the year.

Rainfall in Portland in September

This month sees the most rain, so carrying an umbrella will ensure you stay dry. Typically around 13 days of rainfall are expected, averaging 143 mm (5.6 in) for the month. Rainfall intensity is on the higher side this month. Expect more substantial showers rather than light, passing rain.

Temperature in Portland in September

In September, Portland sees very high temperatures, with highs of 32°C (90°F). Nights drop to around 23°C (73°F). Sunshine and humidity can make it feel even warmer than the raw temperature suggests. Nights stay warm at around 23°C (73°F), so light bedding and good ventilation are worth thinking about.

Sunshine in Portland in September

Expect a lot of sunshine this month, with about 246 hours of sun. These sunny conditions add to the overall experience.

Our weather planner can help you find worldwide destinations with pleasant weather during this period. February, March, April, October, November and December typically offer the best weather for Portland.

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 Portland's climate page.

Portland Temperature in September

Min Temperature 23°C (73°F)  

Max Temperature 32°C (90°F)  

Chance of Rain 43%  

Precipitation 143 mm (5.6 in)  

Rainy days 13 days  

Humidity 75% *  

Sunshine 246 hours *  

Percentage Sunshine 66% *  

* Data from: Corpus Christi, the United States of America (11 KM, 6 Miles).

What to Wear in Portland in September

Warm temperatures in September make for comfortable sightseeing weather. Pack breathable fabrics like cotton shirts, knee-length shorts or skirts, and comfortable walking shoes. A thin long sleeve for indoor spaces is handy. Prepare for significant rainfall with proper waterproof clothing and shoes. And with plenty of sunshine hours, don’t forget sunglasses, sunscreen, and maybe a sun hat.

What To Do in Portland in September

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

Swimming

9/10

Cycling

7/10

Walking

7/10

Camping

6/10

Outdoor sports

7/10

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 Portland's climate page.

More climate data for Portland

Temperature Rainfall Sunshine Humidity

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