Update and verification date: 2026-07-17. This article describes historical climate characteristics and is not a weather guarantee for specific dates; Before departure, you should still check the Central Weather Bureau's short-term forecasts, alerts, and typhoon information.
Taiwan cannot guarantee a dry island for even a single month. Monsoons, terrain, elevation, and typhoons cause different weather conditions simultaneously in the north, south, east, and mountains; When choosing a date, you should first decide on the area and activities, then compare historical climate risks.
The timing and risks of the plum rain season
The Central Weather Bureau pointed out that the plum rain season in East Asia generally falls from May to July, while Taiwan's core climatic plum rain season is about mid-May to mid-June. A front may bring continuous or heavy rainfall, but the start and end of rainfall and the amount of rainfall differ each year; Mountain areas, valleys, and coastal roads should be adjusted according to the alert.
Central Weather Administration: Plum rain season climate explanation
Summer and afternoon thunderstorms and typhoons
From around late June, Taiwan often sees stronger heat and afternoon thunderstorms; typhoons may affect summer and autumn. A month alone cannot predict landfall, but flights, ferries, railways, roads and attractions can stop at short notice. Keep flexible, cancellable alternatives for outdoor and island trips.
Winter is dominated by the northeast monsoon
According to data from the Central Weather Administration, the northeast monsoon will affect Taiwan from October to April of the following year, with northern and northeastern regions more likely to experience windward rainfall; The lowlands in central and southern Taiwan may show a different pattern. Winter cannot be simplified to a dry season across Taiwan; the North Coast, Yilan, and mountainous areas especially need to rely on local forecasts.
Central Weather Administration: Winter climate explanation
Differences between the northern, central, southern, eastern, and alpine regions
The northern and northeastern regions
In autumn and winter, the northeast monsoon makes it more prone to overcast and rainy weather, while summer is hot with afternoon thunderstorms or typhoon risks. For city trips, you can prepare indoor alternatives; for mountain areas, check rainfall and trail announcements separately.
The central and southern regions and outlying islands
Rainfall in central and southern Taiwan is more concentrated in the warm season, but strong convection, monsoons, and typhoons still cause differences; Outlying islands are more vulnerable to wind and waves affecting ferry schedules. Taipei forecasts cannot replace judgments for Tainan, Kaohsiung, or Penghu.
The eastern part is also
The eastern region is simultaneously affected by oceans, terrain, and typhoons, and transportation may be disrupted by heavy rain or earthquakes. High mountains are colder than lowlands year-round, and the weather changes quickly; When climbing, check the corresponding elevation forecasts, park entry regulations, and trail conditions.
A practical method planned by month
From March to April, watch for the spring front and temperature differences; From mid-May to mid-June, include the plum rain season in the contingency plan; In midsummer and early autumn, focus on high temperatures, thunderstorms, and typhoons; After October, the northern and northeastern regions should watch out for the northeast monsoon; When traveling to central and southern regions in winter, check for cold waves and air quality. These are risk warnings, not promises of good weather.
Luggage and booking advice
It's a good time to bring lightweight rain gear, sun protection, hydration products, and layered clothing all year round; In mountainous areas, there is an additional insulation layer. During the rainy season and typhoons that may affect transportation, prioritize accommodation and ticket options for rescheduling, and avoid scheduling international flights and return trips from remote areas too tightly.
Historical climate and short-term forecasts should be separated
Seasonal climate is used to compare long-term risks and cannot answer whether it will rain on a given day. Check trends in the week before traveling, and check township forecasts, police alerts, and traffic announcements within the first 48 hours; During typhoons or heavy rain, we will continue to follow official updates and not follow the article to decide whether to go into the mountains or take a boat.
Official website of the Central Weather Administration
Climate verification conclusion
As of July 17, 2026, this article was verified based on seasonal climate data from the Central Weather Bureau, removing fixed temperature guarantees, single optimal months, and using booking platforms as climate references. Actual itinerary must be adjusted according to destination, altitude, and short-term official forecasts.
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