Yilan City Weather in September
During September, Yilan City experiences high daytime temperatures of 29°C (84°F) and cooler nights around 24°C (75°F). September sits within the rainy season, so expect regular and often heavy rainfall.
Rainfall in Yilan City in September
Yilan City is in the rainy season in September, with rain on around 17 days and an average of 349 mm (14 in). Rainy season showers here are typically intense, often clearing quickly but coming down hard while they last.
Temperature in Yilan City in September
If you're visiting Yilan City in September, expect highs of 29°C (84°F) and overnight lows around 24°C (75°F). Conditions stay fairly consistent through the month, making it easier to plan what to wear. With overnight lows of 24°C (75°F), evenings and nights remain warm. Light clothing and an open window or fan can help you sleep comfortably.
Sunshine in Yilan City in September
With about 146 hours of sunshine, the area enjoys a nice balance of sun and rainy moments, creating a pleasant environment.Our weather planner can help you find worldwide destinations with pleasant weather during this period. March typically offers the best weather for Yilan City.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit Taiwan, check out our Yilan City's climate page.
Yilan City Temperature in September
Min Temperature
24°C (75°F)
Max Temperature
29°C (84°F)
Chance of Rain
57%
Precipitation
349 mm (14 in)
Rainy days
17 days
Humidity
81%
Sunshine
146 hours
Percentage Sunshine
Daily Historical Temperatures
50-year average (1976-2025)
Based on our historical records, temperatures in Yilan City typically stay consistent throughout September, with daily highs averaging around 29°C (84°F). Nights are warm, with lows typically ranging from 23°C (73°F) to 25°C (77°F).
Average temperatures in September
Daily Historical Precipitation
50-year average (1976-2025)
Average daily rainfall for each day of the month based on long-term records.
Average precipitation in September
Historical weather for Yilan City in September
Browse day-by-day weather records for Yilan City spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
Yilan City historical weather extremes in September
Based on 49 years of weather observations (1976-2025), these are the most extreme conditions recorded in Yilan City.
- On September 27, 2017, temperatures climbed to 38°C (100°F), marking the warmest September day on record.
- The lowest daytime temperature in September was 22°C (72°F), recorded on September 29, 1997.
- Nighttime temperatures dropped to 17°C (63°F) on September 30, 1986, marking the coldest September night on record.
Best Places in Taiwan in September
Find out more about the weather in Taiwan and which places have the best travel conditions in this month. See all of Taiwan in September →
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What to Wear in Yilan City in September
Warm but pleasant conditions in Yilan City in September. Focus on lightweight, maybe with natural fabrics, cotton blend shirts, comfortable shorts, and breathable footwear. A light cover-up for sun protection is smart too. It's going to pour! Pack a good poncho and prepare for very wet conditions. Sunglasses could come in handy during the sunnier parts of your trip.What To Do in Yilan City in September
We rated the following activities from 1 (least suitable) to 10 (best) to do.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit Taiwan, check out our Yilan City's climate page.
Temperature Rainfall Sunshine Humidity
See the full Yilan City climate overview or explore weather in Taiwan.
