London weather

Our guide to the weather in London during September

20

Average high

4

UV Index

48mm

Monthly rainfall

73%

Humidity

We've looked at the most up-to-date weather data for London, 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 London weather in September.

What's the temperature like in London during September?

The temperature reaches around 20℃ during the daytime in September, falling away to 12℃ 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 London during September?

On average, there will be 3 rainy days during the month, amounting to 47.8mm in total. That's broadly comparable with the amount of rain we see in England during the summer months, and would be considered dry. You're not likely to see a thunderstorm during your trip.

Is it windy in London 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.

Hotel stays in London

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London Blog posts

From the Ireland's most popular travel bloggers

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Visiting the London Eye - How to skip the queue and get cheap tickets

26th July 2022 by One Step 4ward

Opened to the public in March 2000, the London Eye has quickly become one of the city’s most iconic landmarks. And anyone taking a trip to the UK’s capital should make visiting the London Eye a priority. The London Eye was originally only supposed to be around for five years as a celebration of the Millennium, but it’s since become the UK’s most popular attraction. Now it promises to remain a staple on the tourism scene for years to come....

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20 city break destinations for 2022

28th March 2022 by The Travel Expert

I’m a big fan of city breaks. I love how much you can discover in a new city such a short space of time. However, if you’re not one for pounding the pavements and covering an entire city on foot, settling down with a coffee and people watching in a town square can be just as enjoyable. We are fortunate to have many of Europe’s top city break destinations available from a variety of Irish airports this year. I have picked my top 20 to inspire your next break away. ...

Weather in London

Our month-by-month guide to the weather and climate in London

7.0

London weather in

January
8.0

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February
11.0

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March
14.4

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April
17.1

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May
20.5

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June
22.9

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July
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August
19.9

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September
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October
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November
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December