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 excellent, 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.