Portland Weather in September

In Portland, September brings pleasant daytime temperatures around 22°C (72°F), with nights cooling to 12°C (54°F). Expect quite a bit of rainfall this month.

Rainfall in Portland in September

You can expect rain on roughly 10 days based on historical data, averaging 103 mm (4.1 in) for the month. Individual showers can be quite heavy this month. A proper umbrella or rain jacket is worth having.

Temperature in Portland in September

In September, Portland gets pleasant temperatures, with highs of 22°C (72°F). Nights cool to around 12°C (54°F). A light jacket or extra layer can be useful, especially outside the warmest hours of the day. With overnight lows of 12°C (54°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 Portland in September

There are approximately 228 hours of sunshine this month, resulting in mostly clear days.

Average water temperature in September

With water at 16°C (61°F), it's on the cooler side. Keen swimmers won't be put off, but those who prefer warm water may find it less enjoyable.

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

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• October
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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 12°C (54°F)  

Max Temperature 22°C (72°F)  

Water Temperature 16°C (61°F)  

Chance of Rain 33%  

Precipitation 103 mm (4.1 in)  

Rainy days 10 days  

Humidity 77%  

Sunshine 228 hours  

Percentage Sunshine 61%  

What to Wear in Portland in September

Comfortable temperatures call for an easy wardrobe in September. Pack summer basics like t-shirts and shorts, but include a light jacket for cooler moments. A pair of comfortable walking shoes is essential. Expect heavy rainfall, so bring good rain protection and waterproof bags. The water temperature sits at about 16°C (61°F), which is too chilly for most people to enjoy swimming. Leave the swimsuit at home unless you love cold water. Don't forget sun protection, sunglasses, sunscreen, and a hat. These are all good ideas with this much sunshine.

What To Do in Portland in September

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

Cycling

9/10

Walking

9/10

Camping

6/10

Outdoor sports

9/10

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 Water Temp

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