Climate Insights for Lan Yu

The climate in Lan Yu is hot. The average annual temperature is 26°C and approximately 2322mm of precipitation falls per year. Lan Yu receives a notable amount of rainfall throughout the year, including during its driest month. Lan Yu is in the Northern Hemisphere. Summer begins at the end of June and lasts through September. The summer months are: July, June, August. The coldest months are January, February, December, when temperatures can drop to 21°C.

Lan Yu has relatively stable temperatures year-round, staying within a 8°C range. The warmest month is July, when average highs reach 29°C and the mean temperature sits around 29°C. January is the coolest month, with minimum temperatures around 21°C and an average of 22°C. Daily temperature variation is modest, with an average difference of 1°C between highs and lows. The sharpest temperature change occurs between November and December, with a 2°C shift in average temperatures.

Lan Yu is a very wet location, receiving approximately 2322mm of precipitation annually, which averages out to around 194mm per month. The wettest month is October, averaging 348mm of rainfall. August and September also tend to see above-average precipitation. The driest month is March, with just 58mm. That's 291mm less than October, the wettest month. Rainfall is heavily concentrated in certain months, creating a distinct wet and dry season. Visitors should plan around these patterns, as the difference between peak and low months is dramatic.

Lan Yu is very windy, with an average annual wind speed of 36km/h. For context, sustained winds below 12km/h are generally light, while anything above 25km/h is considered strong. The windiest month is December, averaging 47km/h, which can feel quite blustery and may affect outdoor activities. The calmest conditions occur in July, with average winds dropping to 31km/h, making it an ideal period for wind-sensitive activities. There is moderate seasonal variation in wind speed, with a 16km/h gap between the calmest and windiest months. Wind tends to be stronger during winter months, driven by seasonal pressure systems. The seasonal averages break down to 42km/h in winter, 33km/h in spring, 32km/h in summer, 38km/h in autumn.

It is currently spring in Lan Yu, which began on March 20, 2026. Lan Yu 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 July at around 29°C, while the coldest stretch bottoms out in January near 21°C. Summer is next, beginning on June 21, 2026 — 89 days from now.

The best time to visit Lan Yu is during February and March, when the weather is most comfortable for travellers. During these months, average temperatures hover around 23°C with modest rainfall averaging 70mm per month. By contrast, July can be uncomfortably hot with highs reaching 29°C, while January is the coldest period with lows dropping to 21°C. Despite being the best months overall, some rain is still likely — pack a waterproof layer and plan a mix of indoor and outdoor activities.

The table below shows monthly climate averages for Lan Yu 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.