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What’s Portsmouth Like in September? September in Portsmouth, UK, typically marks a pleasant transition from summer to autumn. Visitors can expect generally mild temperatures, making it ideal for exploring without the intense summer heat or peak crowds.

What is the Weather and Climate in Portsmouth in September? September offers mild weather in Portsmouth. Average daytime high temperatures typically range from 17°C to 19°C (63°F to 66°F), while average nighttime lows are around 11°C to 13°C (52°F to 55°F). Rainfall is moderate, with approximately 60-80mm (2.4-3.1 inches) spread over 10-14 days on average (estimated). Sunshine hours are generally around 5-6 per day. Layered clothing is recommended to account for cooler evenings and potential showers.

What are Typical Costs and Availability in Portsmouth in September? September is generally considered shoulder season, offering a slight decrease in costs compared to peak summer.

What to Expect: Crowds, Events, and Conditions in Portsmouth in September? Expect moderate crowd levels in September, noticeably less than the busy summer months of July and August, especially during weekdays. Family tourism often decreases as school holidays conclude. While major large-scale events are less common than in summer, local markets, festivals, or smaller cultural happenings may occur (check local listings). Conditions are generally favorable for walking and outdoor activities, with the sea remaining suitable for coastal strolls but likely too cool for swimming for most.

What are the Best Activities for Visiting Portsmouth in September? September’s milder weather and fewer crowds make it an excellent time to explore Portsmouth’s key attractions.

For finding free public amenities like restrooms or water fountains during your visit, consider using AllInMap.

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