Singapore's equatorial location and the onset of the southwest monsoon typically produce daily maximum temperatures averaging near 31°C in June, with recent official forecasts indicating a likely range of 29–32°C amid variable cloud cover and afternoon showers. The 31°C outcome leads market-implied odds due to alignment with long-term climatology and current model consensus showing moderate humidity and southeasterly winds limiting extreme heat. El Niño development and positive Indian Ocean Dipole conditions, noted by the Meteorological Service Singapore, have contributed to warmer baseline readings earlier in the month, including peaks above 34°C, yet increased monsoon-driven convection may cap temperatures on June 15. Updated National Environment Agency guidance and refined regional model runs over the next 24 hours represent the key data points that could shift trader positioning.