Recent atmospheric instability from a passing frontal system has introduced variability in short-range forecasts for Buenos Aires on October 5, with ensemble models showing minimum temperatures clustered near 13–14 °C amid overcast skies and light winds. This range sits between the market’s closely matched extremes, as stronger northerly flow or clearer radiational cooling overnight could shift the low several degrees in either direction. Historical October climatology favors mild spring conditions with minima typically 10–15 °C, yet current model spreads reflect uncertainty in boundary-layer moisture and cloud cover that will resolve with updated runs from the Servicio Meteorológico Nacional and global ensembles before resolution. Traders weigh these near-term dynamics against the risk of an unseasonably cool or warm outlier.