Sun Moon Lake
Long-term weather forecast
Long-term weather forecast

Monthly weather forecast and Climate
Sun Moon Lake, Taiwan

A view of the striking Sun Moon Lake in Taiwan, with a dock bridge and ships docked, and a stunning distant view of the mountains
A view of the striking Sun Moon Lake in Taiwan, with a dock bridge and ships docked, and a stunning distant view of the mountains
Sun Moon Lake has a humid subtropical highland type of climate (Köppen climate classification Cwb) with hot and humid summers and short and relatively dry winters. It lies in the hilly and landlocked Nantou County, in the rural Yuchi Township in central Taiwan. The monsoon primarily influences the climate of the lake as well as the entire county, while the numerous mountain peaks, many of which are at least 3000 meters high, also affect the climate.

Sun Moon Lake has a surface elevation of 748 meters above sea level and is 27 meters deep. The topography of the surrounding area consists of low-lying hills and mountains with many hiking trails. Sun Moon Lake derives its name from the geographical fact that its east side resembles a sun and west side resembles a moon. A tiny island lies at the center of the lake.

Summers usually last from April to October around Sun Moon Lake and are long, humid, and wet. The average high temperature is 27.8°C (82°F) at the peak of summer in July. Winters are mild, short, from November to March, and relatively drier than the rest of the year. The peak of the winter season in January sees the average low temperature at 10°C (50°F). The temperature difference between day and night is less due to Sun Moon Lake's location in the tropics.

Sun Moon Lake receives average annual sunshine of 1400 hours. The average humidity is between 70% and 80%, with cloudy skies for a significant part of the year. Annual precipitation is an abundant 2032mm (80") due to the tropical location. The East Asian Monsoon brings heavy rainfall to the region with May to September being the wettest months. Snow is absent around the lake area, but winter days are foggy and may accumulate frost.

Sun Moon Lake mostly records peak temperatures around 33.3°C (91.9°F) during the year, while the lowest temperatures are mostly above freezing.
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The best time to visit Sun Moon Lake is from November to March during the winter season. The cold season has mild to warm days and slightly cold nights. The return of the monsoon makes the season relatively dry and the skies clear of rain-bearing clouds. The drop in humidity keeps the air pleasant, and the surrounding mountains and greenery make Sun Moon Lake area feel like the Switzerland of Taiwan.

The worst time to visit Sun Moon Lake is June to August, which is the peak of the monsoon and summer seasons. The heat is sweltering due to the high humidity, and the rainfall is torrential. The wet season accounts for two-thirds of the annual rainfall and is uncomfortable for visitors unaccustomed to tropical conditions. The skies remain mostly cloudy as the sun rarely gets chances to break the cloud cover.

Sun Moon Lake faces occasional rainstorms and thunderstorms in the monsoon season. Typhoons from the South China Sea and the Pacific Ocean may occasionally reach the region. The proximity to numerous water bodies increases the risk of flooding during the rainy season. The typhoon season peaks around August and brings torrential rainfall that may result in floods and landslides. Tropical cyclones occasionally make landfall in the surrounding areas.

January is the coldest month of the year around Sun Moon Lake with the average temperatures in the mildly cold 10°C (50°F) to 17.2°C (63°F) range. Weather in January »

February is the cloudiest month of the year at Sun Moon Lake that witnesses daily sunshine of only 3 hours. The thick cloud canopy couples with foggy conditions during the mornings. Weather in February »

March is comfortable at Sun Moon Lake with the average temperatures in the warm 12.2°C (54°F) to 20°C (68°F) range. The brief spring season sees a little rise in rainfall. Weather in March »

April starts the wet season around Sun Moon Lake, Taiwan as the region receives pre-monsoon showers to the tune of 127mm (5"). Weather in April »

May sees persistent monsoonal rainfall around Sun Moon Lake to the tune of 205.7mm (8.1") during 20 wet days during the month. The skies remain mostly cloudy. Weather in May »

June hot and wet around Sun Moon Lake as heavy rainfall of 309.9mm (12.2") lashes the Nantou County. Torrential rain occurs in the area, often with thunderstorms and rainstorms. Weather in June »

July is the hottest month of the year at Sun Moon Lake, Taiwan with the average temperatures in the 21.1°C (70°F) to 27.8°C (82°F) range. Weather in July »

August is the wettest month of the year at Sun Moon Lake with massive 327.7mm (12.9") of rainfall. The average high temperature is around 27.8°C (82°F) with humidity around 80%. Weather in August »

The summer heat decreases slightly as the average temperatures register in the 20°C (68°F) to 27.2°C (81°F) zone. The relative humidity is approximately 78%. Weather in September »

The heat subsides gradually as the average temperatures register around 17.8°C (64°F) to 25°C (77°F). The skies are partly cloudy with 5 hours of daily sunshine. Weather in October »

The average temperatures are in the mild 13.9°C (57°F) to 22.2°C (72°F) zone, with crisp air due to low humidity. The northeast monsoon brings relatively less rain. Weather in November »

The average temperatures are in the comfortable range between 11.1°C (52°F) to 18.9°C (66°F) and rarely swing to extremes. December is the driest month of the year. Weather in December »