Montréal weather
Our guide to the weather in Montréal during September
We've looked at the most up-to-date weather data for Montréal, covering the last 12 years up to 2026, plus we've asked our team of travel bloggers for their first-hand experiences in order to answer the most frequently asked questions about Montréal weather in September.
How warm is it in Montréal during September?
The temperature reaches around 21℃ 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 Montréal during September?
On average, there will be 6 rainy days during the month, amounting to 117.7mm 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. There's a small chance that you'll catch a thunderstorm during your trip.
Is it windy in Montréal 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.
How warm is the sea in Montréal during September?
The water around Montréal is around 18℃ 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.
Montréal Blog posts
From the UK's most popular travel bloggers
The Best Things to Do in Montreal – My Amazing Experience
29th July 2025 by The World in My Pocket
Last year, a delightful five-day escape to Montreal allowed for a leisurely exploration of this vibrant city. Rather than racing through a checklist of attractions, the journey unfolded at a relaxed pace, revealing the charm of each leafy street, inviting café, and surprising find along the way. Montreal is a city that invites you to savour its unique character, and this experience was no exception....
Iconic Foods to Eat in Montreal That Will Fill Your Trip With Deliciousness
26th February 2025 by The World in My Pocket
Montreal may not have captured hearts immediately, but its charm unfolds with every corner turned. For those planning a trip to this vibrant city, the culinary landscape is a compelling reason to visit. Montreal boasts a diverse array of iconic dishes that reflect its rich multicultural heritage. From classic bagels to hearty poutine, there’s a feast waiting to be discovered. In this post, we’ll explore the must-try foods that will undoubtedly enhance any trip to this Canadian gem....
Montréal, Canada: A Complete One Day Guide
13th December 2023 by Stoked to Travel
I recently had the pleasure of spending one day in Montréal in October, a distinctly beautiful month to visit. Whilst there are a huge number of things to do in Montréal, I found one day in Montréal still gave me a wonderful insight and experience of the city. ...
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