Taiwan is bracing for a dynamic weather week as two frontal systems are forecasted to sweep across the island, bringing heavy rainfall, brief sunshine, localized heat spikes, and potential thunderstorms, according to the Central Weather Administration (CWA).
🌩️ Detailed Weather Outlook for the Week
1. First Weather Front: Heavy Rain on Tuesday and Wednesday
The first frontal system is expected to approach Taiwan on Monday night (May 5, 2025), intensifying by Tuesday and Wednesday. This system will likely bring widespread rainfall across the island, especially affecting central and northern regions where orographic lift (air forced to rise by mountain terrain) could enhance precipitation levels.
Rain Intensity:
Moderate to heavy, with localized downpours in mountainous and northern regions. Commuters should prepare for water pooling and slower traffic conditions.
2. Temporary Reprieve: Thursday Sunshine with Thunderstorms
On Thursday, the front will temporarily clear, bringing partly sunny skies, especially in lowland areas. However, isolated afternoon thunderstorms are likely, particularly in Taiwan’s central and eastern mountains, due to daytime heating and moisture from the previous front.
3. Second Weather Front: Weekend Rains Return
The second front will arrive on Friday (May 9) and will impact Taiwan through the weekend. This system is forecasted to bring persistent rain, with greater impact on northern, central, and eastern Taiwan.
Rainfall risk:
Expect possible flash floods in low-lying areas and slippery conditions in hilly terrain, which can pose a risk for hikers and outdoor activity.
🔥 Temperature Trends and Foehn Winds
Despite the rain, temperatures will remain unseasonably warm, ranging from 22°C to 32°C across most parts of Taiwan.
Taitung and Southern Foothills: Over 36°C Expected
Due to southwesterly winds, foehn wind effects could elevate temperatures in Taitung County and parts of southern Taiwan, pushing them above 36°C, especially during daylight hours.
Foehn winds are warm, dry winds that descend on the leeward side of mountains and often lead to heat spikes and dry air conditions, which can increase fire risk and impact people sensitive to heat stress.
🌿 Environmental and Practical Impact
- Urban Impact: Cities like Taipei and Taichung may face commuter delays due to waterlogged roads on Tuesday and Friday.
- Agriculture: The rainfall may benefit crops like rice and tea, especially in central Taiwan, but flash flooding could damage infrastructure.
- Tourism: Outdoor plans and travel itineraries may need adjustment, particularly in mountain resorts and coastal zones.
- Health Advisory: Sensitive groups—such as children, the elderly, and those with respiratory conditions—are advised to avoid outdoor activities during thunderstorms or extreme heat episodes.
🛠️ Taiwan’s Weather Readiness: A Quick Look
The Central Weather Administration (CWA) has been increasingly using machine-learning weather models and localized radar tracking to issue early warnings. The growing challenge remains in public compliance, especially during short-term forecast changes. According to the National Science and Technology Center for Disaster Reduction, microburst storms and localized flooding are expected to increase in frequency due to Taiwan’s warming climate.
📌 FAQs
Will both weather fronts affect the entire island?
Yes, though the intensity will vary. The first front will bring island-wide rainfall, while the second will have stronger effects in the north, center, and east.
What are foehn winds and how do they affect health?
Foehn winds are dry, warm downslope winds. In Taitung and southern Taiwan, they may raise temperatures above 36°C, increasing the risk of heatstroke and dehydration.
Should travel plans be adjusted this week?
Yes, especially for hiking or beach travel. Heavy rain and thunderstorms may affect safety and access to some areas.
Will school or work schedules be disrupted?
No official closures have been announced, but authorities may issue alerts if rain becomes hazardous.
Is this unusual weather for Taiwan in May?
No. May marks the start of Taiwan’s plum rain (梅雨) season, characterized by alternating periods of sunshine and heavy rain from frontal systems.
