Southampton Weather in September

During September, Southampton experiences pleasant daytime temperatures of 20°C (68°F) and cooler nights around 12°C (54°F). Expect quite a bit of rainfall. Around 64 mm (2.5 in) is typical.

Rainfall in Southampton in September

You can typically expect 12 days of rain this month, averaging around 64 mm (2.5 in). Expect a fairly normal spread of rainfall this month, with no particular pattern of very heavy or very persistent showers.

Temperature in Southampton in September

September in Southampton is generally perfect, with days reaching 20°C (68°F) and nights settling around 12°C (54°F). This creates a mild day-to-night pattern that is generally easy to manage with the right clothing. With lows of 12°C (54°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 Southampton in September

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

Average water temperature in September

The water is 17°C (63°F) this month — cool enough to feel refreshing on a warm day, but cold enough that most people won't stay in for long without a wetsuit.

If you're a fan of comfortable temperatures and drier conditions, September is a great time to visit.

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• January
• February
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• May
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• October
• November
• December

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

Southampton Temperature in September

Min Temperature 12°C (54°F)  

Max Temperature 20°C (68°F)  

Water Temperature 17°C (63°F)  

Chance of Rain 39%  

Precipitation 64 mm (2.5 in)  

Rainy days 12 days  

Humidity 82%  

Sunshine 149 hours  

Percentage Sunshine 44%  

What to Wear in Southampton 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. The water temperature sits at about 17°C (63°F), which is too chilly for most people to enjoy swimming. Leave the swimsuit at home unless you love cold water. It won't hurt to bring your sunglasses along, as you'll see some sunny periods.

What To Do in Southampton 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 Southampton's climate page.

More climate data for Southampton

Temperature Rainfall Sunshine Humidity Water Temp

See the full Southampton climate overview or explore weather in the United Kingdom.