Lisbon weather
Our guide to the weather in Lisbon during September
Lisbon is a vibrant, sun-drenched city with a rich cultural heritage, making it an ideal destination for Irish travellers in September; however, it can get quite hot during the day, so it's best to plan outdoor activities for the cooler mornings and evenings. We've looked at the most up-to-date weather data for Lisbon, 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 Lisbon weather in September.
How warm is it in Lisbon during September?
The temperature reaches around 26℃ during the daytime in September, falling away to 18℃ at night. 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 Lisbon during September?
On average, there will be 2 rainy days during the month, amounting to 49.2mm 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 Lisbon during September?
You're unlikely to experience any strong winds. Expect a gentle breeze that increases to moderate at times during September. With moderate humidity and mild air temperatures, the breeze will have a slight cooling effect.
How warm is the sea in Lisbon during September?
The water around Lisbon is around 19℃ 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.
Lisbon Blog posts
From the Ireland's most popular travel bloggers
Top 10 things to do in Lisbon - with or without kids
7th December 2021 by The Travel Expert
I recently returned from a fabulous weekend in Lisbon. I had visited briefly many years ago, but it wasn’t until I spent three full days exploring this vibrant city that I really appreciated its beauty. The fact that it is on the coast and has warm temperatures for most of the year certainly helps its appeal, but it was the colourful buildings in the old town, the stunning views of Alfama, and its terrific food scene that captivated me the most....
Lisbon city guide
13th April 2018 by The Daily S'elf
If you’ve already read my Porto post, you might enjoy this Lisbon city guide. I wanted to go to Portugal badly, but couldn’t choose between the two cities, so I spent two nights in each, travelling by train from Porto to Lisbon. Here you’ll find information about Lisbon hotels, what to do, where to eat and drink and other useful information if you’re planning a short city break....
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