Forecast consensus points to a minimum temperature near 30–31°C for Jeddah on September 13, driven by the Red Sea’s thermal inertia and elevated sea-surface temperatures near 31°C that limit nocturnal cooling. High humidity levels of 70–90% overnight suppress radiative heat loss, while light variable winds and partly cloudy conditions further moderate temperature drops compared with drier interior regions. Recent stable high-pressure patterns have maintained similar overnight lows of 29–31°C through early September, with model runs showing only modest day-to-day variation. Traders appear to weigh these persistent maritime influences against the small chance of slightly stronger northerly flow or clearer skies that could allow a dip toward 28°C or hold the minimum at 32°C. Official station readings at King Abdulaziz International Airport will resolve the market once the 24-hour period ends.