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.