Climate Insights for Lan Yu

The climate in Lan Yu is hot. The average annual temperature is 26°C and approximately 2477mm 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 February, January, 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 28°C. February 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 2477mm of precipitation annually, which averages out to around 206mm per month. The wettest month is August, averaging 445mm of rainfall. September and July also tend to see above-average precipitation. The driest month is April, with just 65mm. That's 380mm less than August, 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 relatively calm, with an average annual wind speed of 8km/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 11km/h, though still comfortable for most outdoor activities. The calmest conditions occur in May, with average winds dropping to 6km/h, making it an ideal period for wind-sensitive activities. There is moderate seasonal variation in wind speed, with a 5km/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 10km/h in winter, 7km/h in spring, 7km/h in summer, 9km/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 February near 21°C. Summer is next, beginning on June 21, 2026 — 3 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 81mm per month. By contrast, July can be uncomfortably hot with temperatures reaching 29°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.