Climate Overview
The climate in Cao Bằng is warm and mild. The average annual temperature is 22°C and approximately 1811mm 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: July, June, 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 31°C. The warmest month is July, when average highs reach 31°C and the mean temperature sits around 27°C. December is the coolest month, with minimum temperatures around 11°C and an average of 15°C. Daily temperature variation is modest, with an average difference of 7°C between highs and lows. The sharpest temperature change occurs between November and December, with a 5°C shift in average temperatures.
Precipitation
Cao Bằng is a fairly wet location, receiving approximately 1811mm of precipitation annually, which averages out to around 151mm per month. The wettest month is August, averaging 305mm of rainfall. June and May also tend to see above-average precipitation. The driest month is December, with just 47mm. That's 258mm 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 11km/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 12km/h, though still comfortable for most outdoor activities. The calmest conditions occur in August, with average winds dropping to 9km/h, making it an ideal period for wind-sensitive activities. Wind conditions are fairly consistent throughout the year, varying by only 3km/h between the calmest and windiest months.
Seasons
89 days until Summer
It is currently spring in Cao Bằng, which began on March 20, 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 July at around 31°C, while the coldest stretch bottoms out in December near 11°C. Summer is next, beginning on June 21, 2026 — 89 days from now.
Spring
Temperatures range from 16 to 29°C. Rainfall is heavy, totalling around 425mm across the season with a monthly average of 142mm. Winds are generally light, averaging 12km/h. An umbrella or waterproof jacket is advisable as spring showers are frequent.
Summer
Temperatures range from 24 to 31°C. Rainfall is heavy, totalling around 814mm across the season with a monthly average of 271mm. Winds are generally light, averaging 10km/h. Light, breathable clothing is ideal — perfect conditions for outdoor activities.
Autumn
Temperatures range from 16 to 30°C. Rainfall is heavy, totalling around 381mm across the season with a monthly average of 127mm. Winds are generally light, averaging 10km/h. A waterproof jacket and sturdy footwear are recommended as rain becomes more frequent.
Winter
Temperatures range from 11 to 19°C. Precipitation is moderate at around 191mm for the season, averaging 64mm per month. Winds are generally light, averaging 10km/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 February, March and November, when the weather is most comfortable for travellers. During these months, average temperatures hover around 18°C with modest rainfall averaging 70mm per month. By contrast, July can be uncomfortably hot with highs reaching 31°C, while December is the coldest period with lows dropping to 11°C. Despite being the best months overall, some rain is still likely — pack a waterproof layer and plan a mix of indoor and outdoor activities.
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.
