This morning, Monday, May 25, heavy rain is falling on the first blooming lilacs lining the streets of Montreal. After an F1 weekend that ended in drizzle and was swept by an almost wintry wind, the mid-May summer heat is sorely missed, and we’ve put our jackets back on—but we’re not happy about it.
For the last week of May, the weather is expected to swing back and forth between early spring coolness and days that feel like the height of summer.
Up-and-down weather from May 25 to 31, 2026—the forecast
It’s miserable this morning in Montreal, but it won’t last, and we’ll have a lot of muggy heat early in the week, then drop 10 degrees Celsius before the weekend so it rains, just like this morning, on Friday night. The forecast:
Monday, May 25, 2026 / temperatures between 12 and 22 degrees Celsius, rain in the morning and clearing up in the afternoon
Tuesday, May 26, 2026 / temperatures between 16 and 26 degrees Celsius, mostly sunny
Wednesday, May 27, 2026 / temperatures between 12 and 24 degrees Celsius, sunny but very humid, with a high chance of thunderstorms
Thursday, May 28, 2026 / temperatures between 11 and 17 degrees Celsius, cloudy with some sunshine
Friday, May 19, 2026 / temperatures between 10 and 18 degrees Celsius, cloudy with rain in the afternoon
Saturday, May 30, 2026 / temperatures between 10 and 16 degrees Celsius, rain in the morning and clearing up in the afternoon
Sunday, May 31, 2026 / temperatures between 12 and 19 degrees Celsius, a few clouds but generally sunny
Weather forecast for June 2026 in Montreal
In June, we’ll officially transition into summer on June 21, the summer solstice. Before that, it’s still officially spring. That means keeping a trench coat, an umbrella, and a pair of rain boots within reach—but we’ll still need a good layer of sunscreen in Montreal in June.
Due to El Niño, the “felt” arrival of summer—with consistently high temperatures between 23 and 25 degrees—has shifted from mid-June to the end of the month. Don’t panic; it will still be summer by the end of June 2026. It has to be, right?
Here are some figures for the forecast in Montreal for the month of June;
- between 8 and 28 days of rain
- between 2 and 20 days of sunshine
- maximum temperatures between 12 and 23 degrees Celsius
- 180 mm of rain