San Sebastián weather in September (Basque Country, Spain)

What can you expect from the weather in San Sebastián during September? Check out this comprehensive weather guide.

In September, San Sebastián generally has high temperatures and high rainfall. September falls within the summer season. Anticipate daytime temperatures around 22°C, while night temperatures can drop to 16°C.

San Sebastián in September usually receives high rainfall, averaging around 104 mm for the month. Rain is expected on roughly 13 days.

The city usually sees around 170 hours of sunlight, indicating a moderately sunny period.

In case you lean more towards enjoying temperate temperatures and rain-free days June, July and August typically offer the most optimal weather. In contrast, January, February, November and December tend to have less optimal conditions.

For an in-depth look at the yearly conditions, visit our specialized San Sebastián climate page with graphs.

 

San Sebastián, monthly averages in September

Min Temperature 16°C  

Max Temperature 22°C  

Chance of Rain 43%  

Precipitation 104 mm  

Rainy days 13 days  

Humidity 75%  

Sunshine 170 hours  

Percentage Sunshine  

Where to go in Spain in September

Find out more about the weather in Spain in September and which places have the best weather conditions in this month.

Weather conditions Weather

Temperatures

Precipitation

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Legend perfect weather pleasant tolerable unpleasant poor

Perfect weather is subjective. On this map perfect weather has been defined with temperatures between 20°C and 29°C and not too much precipitation (less than 90 mm a month).

So, what should you wear in San Sebastián in September?

For visitors traveling to San Sebastián, we recommend wearing layers. So maybe a skirt, t-shirt, shorts for during the day and jeans and a warm jacket for some days and evenings. Bring a rain jacket in case it rains during your stay. Plan on layering your clothes.

What To Do

We rated the following activities from 1 (least suitable) to 10 (best) to do in September.

Swimming

6/10

Cycling

9/10

Walking

9/10

Camping

6/10

Outdoor sports

9/10

Interested in more climate information?

Weather and Climate provides you with all the information you need about the climate in San Sebastián.

Our site offers climate and forecast data for every country in the world. Are you going to Spain? On this website you can find historical weather averages for many cities in Spain. Not sure yet where to go? We now have a tool which recommends destinations that suit your ideal climate conditions. Find out where to go with our weather planner.