South Portland Weather in September

In South 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 South Portland in September

Analyzing past climate data, one can expect approximately 10 days of rain, averaging 103 mm (4.1 in). Rainfall intensity is on the higher side this month. Expect more substantial showers rather than light, passing rain.

Temperature in South Portland in September

September in South Portland sees highs of 22°C (72°F) and lows of 12°C (54°F) overnight. This creates a mild day-to-night pattern that is generally easy to manage with the right clothing. Nights cool down to 12°C (54°F), so a light jacket or extra layer is useful once the sun goes down. On the plus side, the cooler nights make for comfortable sleeping conditions.

Sunshine in South Portland in September

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

Average water temperature in September

At 16°C (61°F), the water is cool but manageable for those who don't mind a bit of a shock getting in. Most people adjust after a few minutes.

So this is a great month to visit if you prefer dry days with pleasant temperatures.

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Check the conditions for any month of the year.

• January
• February
• March
• April

• May
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• 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 South Portland's climate page.

South 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% *  

* Data from: Portland, the United States of America (2 KM, 1 Miles).

What to Wear in South Portland in September

For South Portland in September, you'll want flexible clothing. It's wise to pack cotton shirts, comfortable shorts, and a pair of jeans for cooler evenings. A light sweater or jacket is useful for air-conditioned spaces (like buses) or unexpected cool moments. High rain levels are expected, so pack waterproof gear and an umbrella or poncho. Expect water temperatures of around 16°C (61°F), which is definitely too cold for comfortable swimming. Your luggage space is better used for other items. You'll definitely want to pack sunglasses and sunscreen. There will be plenty of bright sunshine this month.

What To Do in South 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 South Portland's climate page.

More climate data for South Portland

Temperature Rainfall Sunshine Humidity Water Temp

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