Tokyo Highest Temperature on April 1 prediction

Market prices 19°C+ at 13.5% but JMA forecasts ~20°C with southerly flows and partial clouds. While cloud cover may limit solar heating, the official forecast suggests meaningful upside risk to the 17-18°C consensus. Key factors supporting 19°C+: mild southerly airflow, low morning precipitation risk (10%), urban heat island effects at Haneda Airport, and JMA's above-average April outlook. However, cloudy conditions and early April timing work against reaching 19°C. Weather model uncertainty exists even 24hr out. Market participants likely know the JMA forecast, so I'm only modestly above market odds. The tight clustering around 17-18°C (85% combined) reflects reasonable caution, but official forecasts pointing to 20°C create modest upside case for 19°C+.