Climate Insights for Yilan

The climate in Yilan is warm and mild. The average annual temperature is 21°C and approximately 3382mm of precipitation falls per year. Yilan receives a notable amount of rainfall throughout the year, including during its driest month. Yilan is in the Northern Hemisphere. Summer begins at the end of June and lasts through September. The summer months are: August, July, June. The coldest months are January, February, December, when temperatures can drop to 13°C.

Yilan sees moderate temperature variation throughout the year, ranging from 13°C to 30°C. The warmest month is August, when average highs reach 30°C and the mean temperature sits around 27°C. January is the coolest month, with minimum temperatures around 13°C and an average of 15°C. Daily temperature variation is modest, with an average difference of 4°C between highs and lows. The sharpest temperature change occurs between November and December, with a 4°C shift in average temperatures.

Yilan is a very wet location, receiving approximately 3382mm of precipitation annually, which averages out to around 282mm per month. The wettest month is October, averaging 553mm of rainfall. June and September also tend to see above-average precipitation. The driest month is March, with just 164mm. That's 388mm less than October, the wettest month. Precipitation varies noticeably between seasons, with the second half (July to December) of the year generally seeing more rainfall.

Yilan is relatively calm, with an average annual wind speed of 7km/h. For context, sustained winds below 12km/h are generally light, while anything above 25km/h is considered strong. The windiest month is October, averaging 10km/h, though still comfortable for most outdoor activities. The calmest conditions occur in June, with average winds dropping to 5km/h, making it an ideal period for wind-sensitive activities. Wind speeds vary significantly across the year, with a 5km/h difference between the calmest and windiest months. This level of variation is worth factoring into travel plans. Wind tends to be stronger during winter months, driven by seasonal pressure systems. The seasonal averages break down to 9km/h in winter, 7km/h in spring, 5km/h in summer, 9km/h in autumn.

It is currently summer in Yilan, which began on June 21, 2026. Yilan is in the Northern Hemisphere, where spring begins in March, summer in June, autumn in September, and winter in December. The warmest period peaks in August at around 30°C, while the coldest stretch bottoms out in January near 13°C. Autumn is next, beginning on September 23, 2026 (7 days from now).

The table below shows monthly climate averages for Yilan based on historical weather data. Min and max temperatures represent typical overnight lows and afternoon highs for each month, shown in degrees Celsius (°C). Precipitation is measured in millimetres (mm) and indicates the average total rainfall per month. Wind speed is the average sustained speed in kilometres per hour (km/h). All values are based on averages from over 10 years of historical weather data. The current month is highlighted for quick reference.