Japan Meteorological Agency's forecast models, updated April 16, have converged on a daytime high of approximately 18°C for Tokyo on April 17 under partly cloudy to overcast conditions, driving trader consensus toward 18°C (33.5% implied probability) and 19°C (32.5%) as frontrunners. This tight race reflects model ensemble spread, where minor differences in predicted cloud cover—potentially reducing solar insolation—and light winds could differentiate outcomes by 1°C; fuller sun might push toward 19°C or 20°C (13%), while thicker clouds favor 17°C (16%). Slightly below the mid-April normal maximum of 19.8°C, the outlook aligns with recent cooler spring patterns. Traders await JMA's evening update for refined guidance before resolution based on official Tokyo station observations.