**Current forecasts from multiple meteorological sources converge on an overnight low in the mid-to-upper 70s for Austin on September 13, 2026, driven by a persistent warm, moist air mass under southerly flow and mostly clear to partly cloudy skies.** Highs near 98–100 °F reflect strong daytime heating, while limited radiational cooling overnight—due to elevated dew points, light south winds of 5–10 mph, and the absence of a cold front or high-pressure subsidence strong enough for sharp drops—keeps minimum temperatures elevated well above the late-summer climatological average of ~69 °F. Model consensus shows little spread, with no signals for either extreme heat retention pushing lows to 88 °F+ or advection of cooler air that could reach the 60s. Trader sentiment appears split between the two outlier bins because short-range forecast uncertainty and resolution criteria (exact hourly minimum) can still shift a few degrees with final model runs or local observations, even as the central tendency points to 76–79 °F. No major pattern changes are expected before the period resolves.