Climate Overview
The climate in Muang Phonsavan is warm and mild. The average annual temperature is 21°C and approximately 1389mm of precipitation falls per year. August is the wettest month, receiving around 314mm of rainfall. Muang Phonsavan is in the Northern Hemisphere. Summer begins at the end of June and lasts through September. The summer months are: May, June, April. The coldest months are January, December, February, when temperatures can drop to 10°C.
Temperature
Muang Phonsavan sees moderate temperature variation throughout the year, ranging from 10°C to 28°C. The warmest month is May, when average highs reach 28°C and the mean temperature sits around 23°C. January is the coolest month, with minimum temperatures around 10°C and an average of 16°C. On average, daily temperatures fluctuate by about 10°C between overnight lows and afternoon highs. The sharpest temperature change occurs between November and December, with a 3°C shift in average temperatures.
Precipitation
Muang Phonsavan is a fairly wet location, receiving approximately 1389mm of precipitation annually, which averages out to around 116mm per month. The wettest month is August, averaging 314mm of rainfall. July and September also tend to see above-average precipitation. The driest month is December, with just 11mm. That's 303mm 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
Muang Phonsavan is relatively calm, with an average annual wind speed of 6km/h. For context, sustained winds below 12km/h are generally light, while anything above 25km/h is considered strong. The windiest month is March, averaging 7km/h, though still comfortable for most outdoor activities. The calmest conditions occur in September, with average winds dropping to 5km/h, making it an ideal period for wind-sensitive activities. Wind conditions are fairly consistent throughout the year, varying by only 2km/h between the calmest and windiest months.
Seasons
87 days until Winter
It is currently autumn in Muang Phonsavan, which began on September 23, 2026. Muang Phonsavan 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 May at around 28°C, while the coldest stretch bottoms out in January near 10°C. Winter is next, beginning on December 21, 2026 (87 days from now).
Spring
Temperatures range from 14 to 28°C. Precipitation is moderate at around 289mm for the season, averaging 96mm per month. Winds are generally light, averaging 6km/h. An umbrella or waterproof jacket is advisable as spring showers are frequent.
Summer
Temperatures range from 20 to 28°C. Rainfall is heavy, totalling around 747mm across the season with a monthly average of 249mm. Winds are generally light, averaging 6km/h. Light, breathable clothing is ideal. Perfect conditions for outdoor activities.
Autumn
Temperatures range from 14 to 27°C. Precipitation is moderate at around 290mm for the season, averaging 97mm per month. Winds are generally light, averaging 6km/h. A waterproof jacket and sturdy footwear are recommended as rain becomes more frequent.
Winter
Temperatures range from 10 to 25°C. Rainfall is relatively light, with around 63mm over the season and a monthly average of 21mm. Winds are generally light, averaging 6km/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 Muang Phonsavan is during January, February, March, October, November and December, when the weather is most comfortable for travellers. During these months, average temperatures hover around 18°C with modest rainfall averaging 33mm per month. By contrast, May can be uncomfortably hot with temperatures reaching 28°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 Muang Phonsavan 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.
