Taipei, Taiwan — November 17, 2025
The most intense northeasterly monsoon of the season is expected to sweep across Taiwan beginning Monday, bringing a significant drop in temperatures and increased rainfall, according to the Central Weather Administration (CWA). Northern Taiwan and Yilan are forecast to see temperatures fall to around 19°C on Monday, with even cooler conditions expected from Tuesday through Thursday.
CWA forecaster Chang Cheng-chuan said the upcoming monsoon surge will dominate Taiwan’s weather pattern until Friday, marking it as the strongest northeasterly system since autumn began. The coldest period is expected from Tuesday to Thursday morning, when temperatures in northern regions, northeastern counties, and areas north of Tainan may drop to 15–16°C, with some open areas reaching lows near 13°C.
Chang noted that while temperatures may rise slightly during the daytime on Thursday and Friday, a more noticeable warm-up is not expected until Saturday when the monsoon weakens.
Temperature Outlook
Northern Taiwan & Yilan:
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Monday: Early temperatures of 21–23°C will decline rapidly by afternoon, falling to around 19–20°C in the evening.
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Tuesday–Wednesday: Cool throughout the day, ranging from 15–16°C in the morning and evening to 18–19°C during midday.
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Thursday: Morning and evening lows of 15–16°C; daytime highs near 20°C.
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Friday: Morning and evening temperatures around 17–18°C; daytime highs around 21°C.
Central & Southern Taiwan:
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Monday: Still relatively warm, with daytime highs near 29°C and morning and evening lows of 20–22°C.
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Tuesday–Wednesday: Temperatures will fall, with early morning and evening readings of 16–17°C and daytime highs between 22–26°C.
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Thursday: Radiative cooling may push temperatures down to 15–16°C, with open areas potentially dropping to 13°C.
Hualien & Taitung:
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Monday: Morning and evening temperatures around 22°C; daytime highs between 27–29°C.
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Tuesday–Wednesday: Cooler, with 18–20°C in the morning and evening and 21–26°C during the day.
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Thursday–Friday: Lows of 18–19°C and daytime highs reaching 22–26°C.
Over the weekend, temperatures across Taiwan are expected to rebound significantly. Morning and evening readings above 20°C are forecast nationwide, with daytime temperatures rising to 23–25°C in the north, around 29°C in the center and south, and 25–27°C in Hualien and Taitung.
Rainfall and Wind Conditions
Rainfall will be most notable Monday and Tuesday, especially in Keelung’s north coast, Greater Taipei’s mountainous areas, and Yilan, where extended periods of rain and occasional heavy downpours are possible.
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North of Taoyuan: Higher chance of showers, with brief rainfall expected in Hsinchu, Miaoli, and Hualien.
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Taitung, Hengchun Peninsula, and central/southern mountains: Scattered showers expected.
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Central & southern lowlands: Mostly cloudy to sunny.
By Wednesday, moisture levels will decrease, resulting in occasional showers in northern Taiwan, Yilan, and Hualien, with isolated rainfall in Taitung and the Hengchun Peninsula. From Thursday through next Sunday (Nov. 23), most of Taiwan will see clearer conditions aside from brief showers in Keelung, northern coastal areas, eastern Taiwan, and the mountains of Greater Taipei.
Chang also cautioned that strong winds will accompany the monsoon beginning Monday afternoon. Regions north of Tainan, the Keelung north coast, the Hengchun Peninsula, and offshore islands may experience sustained winds reaching level 6, with gusts exceeding level 8. Some inland areas may also encounter significant gusts.