Climate Overview
The climate in Cao Bằng is warm and mild. The average annual temperature is 21°C and approximately 2018mm of precipitation falls per year. Cao Bằng receives a notable amount of rainfall throughout the year, including during its driest month. Cao Bằng is in the Northern Hemisphere. Summer begins at the end of June and lasts through September. The summer months are: June, July, August. The coldest months are December, January, February, when temperatures can drop to 11°C.
Temperature
Cao Bằng sees moderate temperature variation throughout the year, ranging from 11°C to 30°C. The warmest month is June, when average highs reach 30°C and the mean temperature sits around 27°C. December is the coolest month, with minimum temperatures around 11°C and an average of 14°C. Daily temperature variation is modest, with an average difference of 6°C between highs and lows. The sharpest temperature change occurs between November and December, with a 4°C shift in average temperatures.
Precipitation
Cao Bằng is a very wet location, receiving approximately 2018mm of precipitation annually, which averages out to around 168mm per month. The wettest month is August, averaging 361mm of rainfall. June and July also tend to see above-average precipitation. The driest month is November, with just 58mm. That's 302mm 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.
Wind
Cao Bằng is relatively calm, with an average annual wind speed of 2km/h. For context, sustained winds below 12km/h are generally light, while anything above 25km/h is considered strong. The windiest month is April, averaging 2km/h, though still comfortable for most outdoor activities. The calmest conditions occur in August, with average winds dropping to 2km/h, making it an ideal period for wind-sensitive activities. Wind conditions are fairly consistent throughout the year, varying by only 0km/h between the calmest and windiest months.
Seasons
90 days until Autumn
It is currently summer in Cao Bằng, which began on June 21, 2026. Cao Bằng 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 June at around 30°C, while the coldest stretch bottoms out in December near 11°C. Autumn is next, beginning on September 23, 2026 — 90 days from now.
Spring
Temperatures range from 15 to 29°C. Rainfall is heavy, totalling around 465mm across the season with a monthly average of 155mm. Winds are generally light, averaging 2km/h. An umbrella or waterproof jacket is advisable as spring showers are frequent.
Summer
Temperatures range from 23 to 30°C. Rainfall is heavy, totalling around 919mm across the season with a monthly average of 306mm. Winds are generally light, averaging 2km/h. Light, breathable clothing is ideal — perfect conditions for outdoor activities.
Autumn
Temperatures range from 15 to 29°C. Rainfall is heavy, totalling around 398mm across the season with a monthly average of 133mm. Winds are generally light, averaging 2km/h. A waterproof jacket and sturdy footwear are recommended as rain becomes more frequent.
Winter
Temperatures range from 11 to 18°C. Precipitation is moderate at around 237mm for the season, averaging 79mm per month. Winds are generally light, averaging 2km/h. A light jacket or sweater is usually sufficient, though cooler evenings may call for an extra layer.
Best Time to Visit
The best time to visit Cao Bằng is during November, when the weather is most comfortable for travellers. During these months, average temperatures hover around 19°C with modest rainfall averaging 58mm per month. By contrast, June can be uncomfortably hot with highs reaching 30°C, while December is the coldest period with lows dropping to 11°C. A light rain jacket is recommended, though showers are generally brief and shouldn't disrupt your plans.
Monthly Climate Data
The table below shows monthly climate averages for Cao Bằng 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.
