Forecast models from sources like WeatherBug and Worldmeteo indicate mostly sunny skies and light winds over São Paulo on September 26, supporting surface heating under high pressure with minimal cloud cover or precipitation. This setup favors afternoon highs in the low 30s°C, aligning with the market's leading outcomes at 32°C (46.5%) and nearby probabilities for 31–33°C. September climatology shows typical highs near 23–25°C, so current conditions reflect above-average warmth amid a spring warming trend and recent drier spells after elevated rainfall earlier in the month. Model consensus remains the key driver, though small shifts in timing of any residual moisture or wind could adjust peak readings by 1–2°C before official measurements resolve the market.