Basel weather
Our guide to the weather in Basel during September
Basel is a vibrant Swiss city with a great range of cultural attractions and outdoor activities. September is a great time to visit, with mild temperatures and the opportunity to enjoy the city's outdoor spaces. We've looked at the most up-to-date weather data for Basel, 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 Basel weather in September.
How warm is it in Basel during September?
The temperature reaches around 21℃ during the daytime in September, falling away to 10℃ at night. The UV index will be moderate at this time of year, so not something to worry about for the average person. However, if you're going to be outside for long periods it's worth wearing a broad spectrum SPF 30+ sunscreen and UV-blocking sunglasses. Remember that bright surfaces, such as water and sand increase UV exposure.
Does it rain in Basel during September?
September is typically the driest month in Basel. On average, there will be 5 rainy days during the month, amounting to 76.0mm in total. That's broadly comparable with the amount of rain we see in England during the summer months, and would be considered dry. There's a small chance that you'll catch a thunderstorm during your trip.
Is it windy in Basel during September?
You're unlikely to experience any strong winds. Expect a light breeze that picks up slightly at times in September. With moderate air temperatures, any breeze will feel cool.
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