Hainan Temperature by Month

The average annual maximum temperature in Hainan, China is 11°C (52°F), with daytime highs ranging from 0°C (32°F) in January to 21°C (70°F) in July. This page covers monthly averages, day-night differences, and how Hainan compares to cities worldwide.

Visitors to Hainan can expect significant temperature changes throughout the year. Nighttime temperatures also vary widely, ranging from 11°C (52°F) in July to -14°C (7°F) in January.

The chart below illustrates the average maximum day and minimum night temperatures in Hainan by month:

Low temperatures are most often recorded between 4 AM and 6 AM, while highs typically occur around 3 PM.

The chart below shows the average temperature throughout the year:

Hainan's average annual maximum temperature is 11°C (52°F). To put that in context, here's how it compares to a few well-known destinations:

Lisbon, Portugal averages 21°C (70°F) annually, warm summers, mild winters, and rain mainly in the cooler months.

On the cooler end, Oslo, Norway averages just 10°C (50°F) annually, with pleasant summers but long, cold winters.

Chicago, USA averages 15°C (59°F) annually, known for extreme seasonal swings, from bitterly cold winters to warm summers.

Tokyo, Japan averages 21°C (70°F) a year, with hot summers, cool winters, and a well-defined cherry blossom spring.

Climate temperature data is typically calculated as a 30-year average. This smooths out year-to-year variability and gives a more reliable picture of what a place is actually like, rather than what happened in any single unusual year.

The readings come from a range of sources, land-based weather stations, ocean buoys, ships, and satellites. That data is collected by weather services around the world, then pooled, quality-checked, and averaged to produce the climate records you see here.

Seasonal temperature shifts influence more than just how warm it feels, they also drive changes in rainfall, cloud cover, and wind patterns throughout the year.

Warmer air holds more moisture, which tends to mean heavier or more frequent rain during the warmer months. When temperatures drop in winter, any precipitation that does fall is more likely to come as snow or sleet, though in Hainan this rarely lasts long on the ground.

For more on Hainan's weather, including monthly rainfall, sunshine hours, and humidity, visit our Hainan climate page.