San Sebastian weather
Our guide to the weather in San Sebastian during September
We've looked at the most up-to-date weather data for San Sebastian, covering the last 12 years up to 2024, plus we've asked our team of travel bloggers for their first-hand experiences in order to answer the most frequently asked questions about San Sebastian weather in September.
How warm is it in San Sebastian during September?
The temperature is extremely stable in September with average highs of 25℃ and lows just 2℃ lower at 23℃. Of course, the high humidity will make it feel even hotter. The UV index will be high at this time of year, so protection against skin and eye damage is needed. Try to limit exposure between 10am and 4pm. Apply broad spectrum SPF 30+ sunscreen every few hours, even if it's cloudy, or more frequently after sweating or swimming, and wear UV-blocking sunglasses too, and bear in mind that bright surfaces, such as sand and water increase UV exposure.
Does it rain in San Sebastian during September?
The answer is no. San Sebastian is typically bone dry in September. You're not likely to see a thunderstorm during your trip.
Is it windy in San Sebastian during September?
You're unlikely to experience any strong winds. Expect a gentle breeze that increases to moderate at times during September. The high humidity and warm temperature will make the breeze feel warm, so any cooling effect will be limted.
How warm is the sea in San Sebastian during September?
The water around San Sebastian is around 21℃ during September. It will feel a little on the cool when first entering, but you'll warm up quickly. Most kids will have no problem with this temperature, but those who feel the cold are unlikely to want to swim.
Weather in San Sebastian
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