Sanjiang is located in subtropical humid monsoon climate zone, with an annual precipitation of around 1493 mm. The region has annually an average temperature of 17-19 degrees Celsius, 1600 hours of sunshine and 79 days of frost period.

Spring comes from mid March to mid May, with humid, rainy and cool weather. Summer, from mid May to end of September, has heavy rains and high temperature. July is the hottest season, with an average temperature of 26.3 ℃. Autumn follows with dry weather till the end of November. Winter is frosty and cold, spanning from the beginning of December till March of the next year. January is the coldest season, with an average temperature of 8.2 ℃.

Sanjiang is located 165 km northwest of Guilin city. For the weather forecast, please see the Guilin's weather report for reference.