Portsmouth Weather in September

Portsmouth in September averages 28°C (82°F) during the day and 19°C (66°F) at night. This is the wettest month of the year.

Rainfall in Portsmouth in September

Prepare for the heaviest rain of the year this month, which often comes in heavy showers. A poncho is a smart choice to stay dry. Historically, approximately 10 days this month are expected to have rain, averaging 170 mm (6.7 in). The rain this month tends to fall in heavier spells rather than light drizzle. When it rains, showers can be significant.

Temperature in Portsmouth in September

If you're visiting Portsmouth in September, expect highs of 28°C (82°F) and overnight lows around 19°C (66°F). Overall, the month follows a fairly predictable daily temperature pattern. Nights cool down to 19°C (66°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 Portsmouth in September

There are approximately 230 hours of sunshine this month, resulting in mostly clear days.

If your ideal day consists of dry skies and pleasant temperatures, April typically offers the best circumstances for Portsmouth.

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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 Portsmouth's climate page.

Portsmouth Temperature in September

Min Temperature 19°C (66°F)  

Max Temperature 28°C (82°F)  

Chance of Rain 33%  

Precipitation 170 mm (6.7 in)  

Rainy days 10 days  

Humidity 74% *  

Sunshine 230 hours *  

Percentage Sunshine 62% *  

* Data from: Hampton, the United States of America (22 KM, 13 Miles).

What to Wear in Portsmouth in September

Warm but pleasant conditions in Portsmouth in September. Focus on lightweight, maybe with natural fabrics, cotton blend shirts, comfortable shorts, and breathable footwear. A light cover-up for sun protection is smart too. It's going to pour! Pack a good poncho and prepare for very wet conditions. Don't forget sun protection, sunglasses, sunscreen, and a hat. These are all good ideas with this much sunshine.

What To Do in Portsmouth in September

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

Swimming

8/10

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 Portsmouth's climate page.

More climate data for Portsmouth

Temperature Rainfall Sunshine Humidity

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