**Recent forecasts for São Paulo on June 15, 2026, center on daily highs of 16–19 °C, aligning with the market’s concentration of probability on 17–19 °C outcomes.** June marks mid-winter in the Southern Hemisphere, when average maximum temperatures normally run near 21–23 °C but frequently dip lower under the influence of polar air masses or strengthened subtropical highs. Current model guidance from sources such as timeanddate and World Weather Online indicates a cooler air mass arriving with cloud cover and showers, limiting daytime warming and keeping the highest reading in the upper teens Celsius or slightly below. Recent observations reinforce this outlook: highs on June 13–14 reached only 20–22 °C before falling, and the 15th forecast shows continued suppression to around 16–18 °C amid overcast skies and light rain. These conditions reduce the chance of stronger solar heating or warmer advection that would push readings toward 20 °C or above. Uncertainties remain in exact model timing of any clearing or wind shifts, yet the consensus favors the narrow 17–19 °C band reflected in current trader positioning. Updated official forecasts from Brazilian meteorological agencies or refined numerical model runs over the next 24 hours will likely determine whether the distribution tightens further around 18 °C.