Climate Overview
The climate in Nong Khai is hot. The average annual temperature is 27°C and approximately 1743mm of precipitation falls per year. August is the wettest month, receiving around 437mm of rainfall. Nong Khai is in the Northern Hemisphere. Summer begins at the end of June and lasts through September. The summer months are: April, May, March. The coldest months are December, February, January, when temperatures can drop to 18°C.
Temperature
Nong Khai sees moderate temperature variation throughout the year, ranging from 18°C to 36°C. April is the hottest month, with daytime highs reaching 36°C and an average of 30°C. December is the coolest month, with minimum temperatures around 18°C and an average of 23°C. On average, daily temperatures fluctuate by about 10°C between overnight lows and afternoon highs. The sharpest temperature change occurs between February and March, with a 3°C shift in average temperatures.
Precipitation
Nong Khai is a fairly wet location, receiving approximately 1743mm of precipitation annually, which averages out to around 145mm per month. The wettest month is August, averaging 437mm of rainfall. July and June also tend to see above-average precipitation. The driest month is December, with just 6mm. That's 430mm 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
Nong Khai 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 February, averaging 2km/h, though still comfortable for most outdoor activities. The calmest conditions occur in September, with average winds dropping to 2km/h, making it an ideal period for wind-sensitive activities. There is moderate seasonal variation in wind speed, with a 0km/h gap between the calmest and windiest months.
Seasons
89 days until Autumn
It is currently summer in Nong Khai, which began on June 21, 2026. Nong Khai 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 April at around 36°C, while the coldest stretch bottoms out in December near 18°C. Autumn is next, beginning on September 23, 2026 — 89 days from now.
Spring
Temperatures range from 22 to 36°C. Rainfall is heavy, totalling around 317mm across the season with a monthly average of 106mm. Winds are generally light, averaging 2km/h. An umbrella or waterproof jacket is advisable as spring showers are frequent.
Summer
Temperatures range from 26 to 33°C. Rainfall is heavy, totalling around 1024mm across the season with a monthly average of 341mm. Winds are generally light, averaging 2km/h. Light, breathable clothing is ideal — perfect conditions for outdoor activities.
Autumn
Temperatures range from 21 to 33°C. Rainfall is heavy, totalling around 366mm across the season with a monthly average of 122mm. Winds are generally light, averaging 2km/h. A waterproof jacket and sturdy footwear are recommended as rain becomes more frequent.
Winter
Temperatures range from 18 to 32°C. Precipitation is minimal, with only around 36mm for the entire season. 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 Nong Khai is during January, February and December, when the weather is most comfortable for travellers. During these months, average temperatures hover around 24°C with modest rainfall averaging 12mm per month. By contrast, April can be uncomfortably hot with temperatures reaching 36°C. With minimal rainfall expected, you can pack light and plan outdoor activities with confidence.
Monthly Climate Data
The table below shows monthly climate averages for Nong Khai 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.
