Current forecasts for Toronto on September 9 point to an overnight low near 19°C amid an incoming low-pressure system and associated rain or thunderstorms, which limit radiative cooling through persistent cloud cover, elevated humidity, and increased wind mixing. This setup creates genuine uncertainty between cooler outcomes around 14°C or below—possible if the system weakens or clears faster than expected—and warmer readings of 24°C or higher, which could occur with sustained overcast conditions and southerly flow suppressing nocturnal temperature drops. Model consensus shows tight clustering near the historical average low of 15°C but diverges on exact timing and intensity of precipitation, directly explaining the near-even market odds between extremes and mid-range values like 19–20°C. Updated Environment Canada or GFS runs in the next 24–48 hours will likely resolve much of this spread.