Little change has occurred with respect to the information presented in the above posting. As a result, here are the dominant weather conditions for Saturday, July 27th for the Montreal area:
Temperature/Humidity
Maximum temperatures should attain 27-28 C by the mid-afternoon hours, along with borderline moderate-high humidity levels, making it feel like as much as 33-34 C. By the late-evening period, temperatures should decline to 24-25 C in the metropolitan area, with continued borderline moderate-high humidity, generating humidex values of 27-28 C.
Precipitation
A few convective showers/rainfall and non-severe thunderstorms are generally not expected until the mid-overnight period and onwards into Sunday (July 28th), owing to a cold front moving in from the West. A few thunderstorms, however, may be reaching severe limits for late-day Sunday. The afternoon for today should be mostly sunny, with a few high-level cirrus clouds and isolated low-level cumulus. That said, in advance of the front, mid-levels of the troposphere will gradually become saturated, prompting largely mid-level partly cloudy skies into the evening.
Wind
Winds are expected to be mostly from the ESE (occasionally SE) for the afternoon and will be light at 9-12 km/h (an increase from the 5-8 km/h specified in the above post). Identical tendencies are shown for the evening hours, although there is slight shift to Easterlies by the late-afternoon/early-evening. As a result, smoke should be blowing adequately away from the audience at La Ronde directly, though, as a consequence, towards sections of Notre-Dame street closest to the firing site (i.e. North of the bridge on Notre-Dame street), causing the display to appear murky from those vantage points. For those on Notre-Dame street, the closer you are positioned to the bridge (and Southward), the better, since winds could occasionally be from the ESE. However, viewing will still likely be difficult.
That’s the way the weather should generally work. In summary, a pleasant evening, with gradually partly cloudy skies at mid-levels, warm temperatures, light ESE/East winds, and borderline moderate-high humidity.
Trav.
Edit: *Also, for those interested, the overnight low following the Croatian display (so, the early morning of July 25th), though not a record for the absolute coolest minimum temperature to take place for the month of July, it was the third coolest minimum temperature to occur in recorded history for the Montreal area for July 25th.