Santiago weather
Our guide to the weather in Santiago during September
We've looked at the most up-to-date weather data for Santiago, 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 Santiago weather in September.
How warm is it in Santiago during September?
The temperature is extremely stable in September with average highs of 28℃ and lows just 3℃ lower at 26℃. 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 Santiago during September?
September is typically the wettest month in Santiago. On average, there will be 5 rainy days during the month, amounting to 123.0mm in total. That's a significant amount of rain. For comparison, the wettest months in the UK typically sees between 80mm and 100mm, depending on where you are. Due to the high temperature and humidity, you might expect lots of thunderstorms, however they're actually fairly infrequent at this time of year. On average, September will see just 3 days that produce a storm.
Is it windy in Santiago 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.
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