Portsmouth Weather in September

In Portsmouth, September brings pleasant daytime temperatures around 19°C (66°F), with nights cooling to 13°C (55°F). Expect quite a bit of rainfall this month.

Rainfall in Portsmouth in September

Records from the past 30 years suggest around 11 days of rain, with 65 mm (2.6 in) average for the month. The rainfall pattern this month is fairly balanced. Showers tend to be moderate rather than extreme.

Temperature in Portsmouth in September

Daytime temperatures in Portsmouth reach 19°C (66°F) in September, dropping to 13°C (55°F) at night. September is part of summer. Even when the weather is stable, mornings and evenings can still feel distinctly cool. With lows of 13°C (55°F), nights are cool. If you're out after dark, an extra layer will keep you comfortable. The cooler air at night is also great for getting a good rest.

Sunshine in Portsmouth in September

The area enjoys a moderate level of sunlight, with around 149 hours. It's a good balance between sunny and cloudy days.

For Portsmouth itself, July and August generally stand out with the best circumstances. If you're seeking pleasant, dry and sunny weather somewhere else in the world, our weather planner can help you explore other options.

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For a detailed overview over the year and the best time to visit the United Kingdom, check out our Portsmouth's climate page.

Portsmouth Temperature in September

Min Temperature 13°C (55°F)  

Max Temperature 19°C (66°F)  

Chance of Rain 38%  

Precipitation 65 mm (2.6 in)  

Rainy days 11 days  

Humidity 82% *  

Sunshine 149 hours *  

Percentage Sunshine 44% *  

* Data from: Southampton, the United Kingdom (25 KM, 15 Miles).

What to Wear in Portsmouth 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. It won't hurt to bring your sunglasses along, as you'll see some sunny periods.

What To Do in Portsmouth in September

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

Swimming

6/10

Cycling

10/10

Walking

10/10

Camping

8/10

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 Kingdom, 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 Kingdom.