Recent numerical weather prediction models from sources including the GFS and local meteorological services indicate mostly sunny conditions over Istanbul on September 1 under a stable high-pressure regime, with forecast maximum temperatures clustering around 28–30°C. This aligns with the early-September climatological normal of approximately 25–28°C for daily highs, as seasonal cooling begins following peak summer warmth. Northerly or northeasterly flow across the Sea of Marmara is expected to limit further warming while suppressing cloud cover and precipitation chances below 10%. Trader consensus reflected in the market-implied odds favors 26–27°C outcomes, consistent with typical model consensus ranges and historical analogs for the date, though minor downward revisions in ensemble means over the past 48 hours have reinforced probabilities for values near or slightly below the forecast peak. Updated model runs and official briefings from regional agencies in the final 24 hours before resolution will provide the key inputs for any further shifts.