Montreal's August weather forecast calls for serious heat but don't ditch that umbrella yet

After a soggy and sticky start to summer, August in Montreal may finally bring the kind of summer weather many of us have been waiting for. But before you get too excited about endless blue skies and sunny stretches, you might want to brace for a few more storms.

According to long-range data from the 2024–2025 Farmers' Almanac, August will be warmer than usual in southern Quebec, with average daytime highs around 20 °C, which is about a degree above normal. That said, the month is also expected to bring above-average precipitation — around 120 mm total, or roughly 25 mm more than usual.

The Almanac uses a centuries-old blend of astronomical and mathematical data to make long-term weather predictions

Here's how southern Quebec's August forecast is shaping up, according to The Farmers' Almanac

The Farmers' Almanac's August forecast

August 1st to 3rd

• Good weather.

August 4-7

• Thunderstorms, then a return to generally mild weather.

August 8-11

• Heavy showers and some isolated violent thunderstorms are possible, then sunny spells.

August 12 to 15

• Pleasant weather.

August 16-19

• Thunderstorms, then back to good weather.

August 20-23

• Clear skies, then unstable weather with showers.

August 24-27

• Generally nice and warm.

August 28 to 31

• The heat persists.

If the forecast holds, Quebecers can expect a warm but occasionally wet end to the season. And after the spring and early summer we've had, that might just be the most on-brand outcome yet.

So, if you're planning to sneak in some late-summer road trips, beach days, or terrasse hangs, the second week of August looks like your best bet. Still, don't be surprised if things flip quickly — this year's weather has been anything but predictable.

You can read the Almanac's full summer forecast here.

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