Singapore's equatorial position and Southwest Monsoon regime keep daily maxima typically between 30–34 °C in late June, with the market clustering tightly around 30–32 °C because short-term model runs show only modest day-to-day differences. Cloud cover, convective showers, and wind speed are the dominant variables: thicker cloud reduces incoming solar radiation and caps the peak, while clearer intervals under the monsoon flow allow temperatures to reach the low 32 °C range. Recent NEA guidance and international models indicate scattered showers and moderate humidity through the weekend, keeping most ensemble members near 31 °C; any reduction in rainfall or increase in insolation could shift the outcome upward by 1 °C. Historical June maxima average near 31 °C, so traders are pricing the narrow scientific uncertainty between typical monsoon suppression and occasional clearer, warmer spells.