**Consensus forecasts from the National Weather Service and other models point to a daily high in Seattle on September 24 in the low 60s°F (around 59–62°F), driven by increasing cloud cover and an approaching frontal system that will limit daytime heating.** As of September 22, conditions feature mostly cloudy skies with only a slight afternoon rain chance, keeping temperatures well below recent late-summer peaks and seasonal averages near 70°F. Persistent marine layer influence and northeasterly flow are suppressing insolation, while the incoming system adds moisture and further reduces solar warming. This setup creates low uncertainty in the core range, though traders appear focused on tail risks—such as unexpected clearing that could push readings toward 70°F+ or heavier rain and cooler advection dropping the high to 51°F or below. Updated NWS model runs and short-term guidance over the next 48 hours will be key, as small shifts in cloud timing or frontal speed could refine the exact maximum. Historical September variability in the Pacific Northwest underscores how quickly such patterns can evolve.