Weather in San Sebastian in September

During September, San Sebastian, Spain typically experiences mild and pleasant weather. The temperature is comfortable, making it an ideal time for outdoor exploration. The city enjoys a good balance of sunshine and occasional rain, which keeps the surroundings lush and vibrant. Humidity is generally moderate, contributing to a fresh atmosphere perfect for enjoying local seasonal highlights and outdoor activities.

September Climate Overview

• Average Temperature: 17°C to 24°C
• Rainfall: Approximately 120 mm
• Sunshine Hours: Around 6 to 7 hours per day
• Sea Temperature: 21°C
• Humidity: Approximately 75%
• Wind Speed: Moderate, 12 km/h on average

What to Expect in September

Daytime Conditions

Daytime in September usually feels warm, with comfortable temperature highs reaching up to 24°C. The sun is often out, providing ample light for exploring the city’s attractions. Humidity levels, while present, are not overbearing, making afternoons suitable for outdoor activities.

Rainfall Patterns

Rainfall in September is moderate and can vary; showers are scattered rather than consistent. This means unexpected rain might occur, but it rarely disrupts travel plans. Carrying a light raincoat or umbrella helps to stay prepared while exploring.

Evening Conditions

Evenings in San Sebastian cool down to about 17°C, offering a refreshing change from the warmer daytime. A light breeze often accompanies the cooler temperatures, creating a comfortable setting for evening strolls or dining outdoors.

Best Activities in San Sebastian in September

• Outdoor Activities: September is perfect for hiking in the surrounding hills, enjoying the sights of the city’s architecture, and visiting local markets to experience regional produce.
• Seasonal Highlights: Being the harvest season, visitors can enjoy a variety of fresh foods reflective of the local agriculture.
• Water-based or Nature-based Activities: The mild sea temperature makes it a good time for water sports or spending leisurely time by the coast.

What to Pack for September

• Light layers suitable for both daytime warmth and cooler evenings
• Protection from sun or rain, including a hat, sunscreen, and an umbrella
• Comfortable footwear suitable for walking and exploring varied terrain
• A reusable water bottle to stay hydrated during outdoor activities