Taiwan's first northeasterly wind system of the autumn arrives this week, bringing a sharp cool-down in the north — welcome relief after summer heat, but wet weather for coastal and eastern areas.

• The northeast winds hit from Wednesday through Friday, with northern Taiwan feeling the strongest effect.
• Overnight lows in the north drop to 17-20°C, helped by clear skies and dry air letting the ground cool fast.
• Central and southern Taiwan stay milder overnight, and daytime highs stay near 30°C before easing on Friday.
• Rain moves into the north coast and the eastern counties of Yilan and Hualien, heaviest on Friday.

Outlook: The winds weaken over the weekend with scattered showers, and drier air returns early next week.