September weather forecast
Laos

September in Laos signifies the transitional phase from the wet season to the dry season. While the rains persist, there is a gradual decline in precipitation and a slight drop in temperature as the month progresses.

In Vientiane, the capital in the center-south region, daytime temperatures are slightly lower compared to the previous months, averaging 31°C (87.8°F). However, due to the continued precipitation, the atmosphere remains humid, retaining the monsoonal characteristics.

Similarly, in the northern region around Luang Prabang, daytime highs stay steady at 30°C (86°F). The cooler nighttime temperatures in the highlands continue to provide relief from the warm days.

Although September remains a wet month, there is a decline in the total amount of rainfall compared to August. The Bolaven Plateau, in the south, continues to receive heavy rainfall, enhancing its lush and green scenery. However, the number of rainy days starts to reduce gradually, indicating the approaching end of the wet season.

Despite the ongoing rains, Laos still experiences around 7 to 8 hours of sunshine per day in September. The sun's ultraviolet index remains relatively high, so sun protection is still crucial for outdoor activities.

Relative humidity in September remains high, around 83%, due to the moist conditions. The weather conditions in September are reminiscent of the monsoon season but also signal the imminent arrival of drier and cooler weather, hinting at the changes to come in the following months.

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• Vientiane - September »
  On the first day of September in Vientiane sunrise is at 05:55 and sunset at 18:23. On the last day of September, in Vientiane, sunrise is at 05:59 and sunset at 17:59 +07.
• Luang Prabang - September »
  In Luang Prabang, during September, the rain falls for 12 days and regularly aggregates up to 173mm (6.81") of precipitation. In Luang Prabang, during September, the rain falls for 12 days and regularly aggregates up to 173mm (6.81") of precipitation.
• Pakse - September »
  September brings a marked change in Pakse, Laos's weather conditions with a dramatic decrease in rainfall to 298mm (11.73"). In Pakse, in September, during 13 rainfall days, 298mm (11.73") of precipitation is typically accumulated.
• Savannakhet - September »
  In Savannakhet, during September, the rain falls for 17 days and regularly aggregates up to 219mm (8.62") of precipitation. In Savannakhet, during September, the rain falls for 17 days and regularly aggregates up to 219mm (8.62") of precipitation.
• Thakhek - September »
  On the first day of September in Thakhek, sunrise is at 05:46 and sunset at 18:14. On the last day of September, in Thakhek, sunrise is at 05:50 and sunset at 17:50 +07.
• Phonsavan - September »
  In September, in Phonsavan, the rain falls for 16 days. With the beginning of fall, September in Phonsavan witnesses a departure from the extreme weather conditions of the summer months.
• Muang Kasi - September »
  In Muang Kasi, Laos, in September, it is raining for 27.9 days, with typically 144mm (5.67") of accumulated precipitation. On the last day of September, in Muang Kasi, sunrise is at 06:01 and sunset at 18:00 +07.
• Luang Namtha - September »
  March through September, with an average maximum UV index of 12, are months with the highest UV index in Luang Namtha, Laos. On the first day of September in Luang Namtha, sunrise is at 05:58 and sunset at 18:30.
• Muang Pa - September »
  In September, the average heat index, which represents the influence of relative humidity on air temperature, is appraised at 41°C (105.8°F). In September, in Muang Pa, Laos, the rain falls for 22.8 days.