Climate and monthly weather forecast
Sanya, China

Located in China, the city of Sanya experiences a tropical wet and dry, or savanna, climate under the Köppen climate classification. The geographical position supports warm weather throughout the year, with a clear differentiation in terms of rainfall and temperature fluctuations with seasonal changes.

Unraveling the climatological data reveals that a year in Sanya is marked by high humidity, significant rainfall, and high temperature. There is a smooth progression in the temperature range with the minimum average temperature of 18.5°C (65.3°F) in January, which steadily increases upto a peak of 26.1°C (79°F) in June. This variation is similarly mirrored in the high temperature dynamics starting from an average of 26.1°C (79°F) in January, culminating in an apex of 32°C (89.6°F) in May, and then cooling down slightly for the rest of the year.

Moreover, it is the ample sunshine hours, ranging from 5 hours per day from January to March, and June to December, peaking in May at 7 hours per day, which contribute to the general warmth. Daylight hours exhibit a marginal variation with a peak of 13.2 hours per day in June while the shortest duration is observed in January with 11.2 hours per day.

A rather striking aspect of Sanya's climate is the pronounced rainy season. Hours of rainfall are generally contained within the middle months of the year, with a dramatic escalation from 19mm (0.75") in March to intense showers of up to 251mm (9.88") in September. This pattern rapidly diminishes towards the end of the year, marking December as the month of minimum average rainfall with 11mm (0.43").

Understanding the climatological patterns reveals the most suitable period to plan a visit to Sanya. Accordingly, the end of autumn, beginning of winter - November and December are the prime months to visit. With an average high temperature of 30.2°C (86.4°F) in November tapering down to 28.5°C (83.3°F) in December, the city provides an optimal setting for sightseeing. During these months, daylight duration ranges 11.3 hours to 11 hours a day maintaining a comfortable warmth during the day. Rainfall is at its lowest ebb, from a marginal 58mm (2.28") in November to a minimal 11mm (0.43") in December, resulting in dryer days and serene nights.

Contrarily, frequency of downpours are sturdy indicators of the months that are less suitable for touristic activities. If schedules are flexible, it is advisable to avoid a visit between May and October when the city remains under the throes of monsoons. Rainfall escalates from 142mm (5.59") in May to a peak of 251mm (9.88") in September, making outdoor activities challenging. Temperatures also reach their zenith during this period resulting in a sweltering combination of rain and heat.

In Sanya, the signs of spring are perceptible from February to April. Weather during this period is characterized by a significant rise in temperatures, with average lows rising from 19.8°C (67.6°F) to 24.2°C (75.6°F) and average highs ascending from 26.8°C (80.2°F) to 30.7°C (87.3°F). Rainfall metrics shed light on an increase from 13mm (0.51") in February peaking at 43mm (1.69") in April, heralding the onset of the wet season.

Summer extends from May to July in Sanya. The highest temperatures are observed during these months, with monthly highs averaging from 32°C (89.6°F) in May, slightly cooling to 31.7°C (89.1°F) by July. This is coupled with marked rainfall, commencing from 142mm (5.59") in May, intensifying to 198mm (7.8") by July.

The transition into autumn, occurring between August and October, witnesses a slight decline in high temperatures from 31.4°C (88.5°F) to 30.2°C (86.4°F). By contrast, there is augmented weather volatility due to peaking precipitation measures topping at 251mm (9.88") in September, accompanied by 17 days of rainfall, before gradually tempering down to 235mm (9.25") in October.

Winter, from November to January, is the driest season in Sanya. Average high temperatures decline from 30.2°C (86.4°F) in November, dropping to a yearly low of 26.6°C (79.9°F) in January. Concurrently, winter season is marked by the lowest rainfall measurements, scaled down from 58mm (2.28") in November to 11mm (0.43") by January. Moderate sea temperatures add to the pleasantness, with observations ranging between 26.6°C (79.9°F) to 24.5°C (76.1°F).

The weather in Sanya, China, during January, marks the start of the year with moderate conditions. January offers the mildest sea temperature of the year at 23.4°C (74.1°F), inviting tourists to enjoy water sports activities. Weather in January »

February is a month of subtlety in Sanya as the weather transitions slowly towards spring. The slight rise in temperatures from January does not significantly alter the overall weather pattern. Notwithstanding the increase in rainfall to 13mm (0.51"), February still belongs to the set of drier months in Sanya. Weather in February »

The arrival of March in Sanya introduces a visible shift towards warmer weather. With a moderate UV index of 12, visitors should consider bringing adequate sun protection. Despite an increase in average rainfall to 19mm (0.75"), the rain does not last long enough to dampen the high spirits of visitors. Weather in March »

April in Sanya takes a leap into a warmer, more humid climate from the more moderate March weather. Noteworthily, it becomes the wettest month so far, receiving a significant rainfall measuring from 19mm (0.75") in March to 43mm (1.69"). Weather in April »

May marks the onset of summer in Sanya, featuring distinctive weather traits, making it easily recognizable. It escalates dramatically from the 43mm (1.69") precipitation in April to 142mm (5.59"), making it one of the wettest months in Sanya. Weather in May »

June is a distinguished month in Sanya's annual weather cycle, denoting the peak of summer. This month witnesses the year's highest sea temperature at 29.7°C (85.5°F), offering a perfect time for beach vacations and water-related activities. Weather in June »

Continuing with the warmth of June, July in Sanya embraces the full swing of the summer. Despite a drop in sea temperature, conditions remain favorable for seaside activities. Increased rainfall adds to the humidity, creating a characteristic summer ambience. Weather in July »

August in Sanya, is a month of continuance, holding firmly onto the robust summer climate. With a relatively high UV index of 12, visitors are advised to adhere to sun safety measures for a more comfortable experience. The influence of monsoon is also evident with an increase in rainfall to 222mm (8.74") compared to July's 193mm (7.6"). Weather in August »

September ushers in transitional weather in Sanya, characterized by declining temperatures, rainfall, and daylight hours. September experiences the highest amount of rainfall in the year at 251mm (9.88"), thereby marking it as the wettest month. Weather in September »

Sanya in October radiates a welcoming atmosphere as temperatures, rainfall, and humidity begin to decrease. As a note, a significant decrease in rainfall occurs, scaling down from 251mm (9.88") in September to 235mm (9.25"). The arrival of autumn is further confirmed by shorter daylight hours. Weather in October »

November in Sanya graces the city with a remarkable change, turning away from the summer-autumn transition. The sharp decrease in rainfall to 58mm (2.28") compared to October's 235mm (9.25") indicates the arrival of the dry season. Weather in November »

December ushers in the end of the year in Sanya with a continuation of the pleasant weather from November. Notably, rainfall drops further to a meager 11mm (0.43"), making December the driest month. The cool and dry weather creates the perfect backdrop for end-of-year celebrations. Weather in December »