May weather forecast
Laos

May in Laos signifies the end of the hot season and the commencement of the rainy season. The month is marked by a gradual drop in temperatures from the intense heat of April, along with a considerable increase in rainfall.

In the center-south region, Vientiane begins to experience more moderate temperatures compared to the preceding month, with average daytime highs around 33°C (91.4°F). Nevertheless, the heat remains palpable during the day. Vientiane's position in the low-lying plains near the Mekong River continues to contribute to its hotter conditions compared to more elevated regions.

Conversely, the region around Luang Prabang in the north also witnesses a decrease in daytime temperatures to about 32°C (89.6°F). The cooler nights persist, particularly in the highlands, offering a reprieve from the daytime heat.

May sees a noticeable increase in rainfall as the southwest monsoon begins to influence the climate, marking the onset of the wet season. Despite the increase in rain, the average number of sunshine hours remains the same, at about 8 to 9 hours per day. However, the sun's ultraviolet index drops slightly due to the onset of monsoonal rains but still remains high, necessitating sun protection during outdoor activities.

The average relative humidity also increases significantly in May, reaching up to 75% as the rainy season begins. This change in weather brings a level of relief from the intense heat of the preceding months. Still, it also introduces a new set of challenges, particularly in terms of outdoor activities and transportation due to the increased rainfall.

May does not hold any extreme weather records in Laos. Nevertheless, it is a critical month due to the significant shift in weather patterns, from the scorching hot season to the cooler, wetter monsoon season. This transition period can lead to unpredictable weather at times, making it a unique time to experience the diversity of Laos' tropical climate.

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• Vientiane - May »
  On the last day of the month, sunrise is at 05:33 and sunset at 18:41 +07. On the first day of May in Vientiane sunrise is at 05:42 and sunset at 18:30.
• Luang Prabang - May »
  On the first day of May in Luang Prabang sunrise is at 05:42 and sunset at 18:34. March through September, with an average maximum UV index of 12, are months with the highest UV index in Luang Prabang, Laos.
• Pakse - May »
  On the last day of the month, in Pakse sunrise is at 05:25 and sunset at 18:23 +07. May signals the onset of true monsoon weather in Pakse, Laos as evidenced by the substantial rise in rainfall to 223mm (8.78").
• Savannakhet - May »
  In Savannakhet in May, it is raining for 16 days, with typically 168mm (6.61") of accumulated precipitation. In Savannakhet in May, it is raining for 16 days, with typically 168mm (6.61") of accumulated precipitation.
• Thakhek - May »
  On the first day of May in Thakhek, sunrise is at 05:34 and sunset at 18:21. Despite the escalating precipitation, Thakhek's weather continues to accommodate extended sunlight hours mirroring the trends of previous months.
• Phonsavan - May »
  On the first day of May in Phonsavan, sunrise is at 05:38 and sunset at 18:30. In Phonsavan, in May, during 18 rainfall days, 194mm (7.64") of precipitation is typically accumulated.
• Muang Kasi - May »
  On the last day of the month, in Muang Kasi sunrise is at 05:32 and sunset at 18:45 +07. In Muang Kasi, Laos, in May, it is raining for 28.3 days, with typically 132mm (5.2") of accumulated precipitation.
• Luang Namtha - May »
  The months with the most sunshine in Luang Namtha, Laos, are January through May, with an average of 7h of sunshine. The yearly peak temperatures in Luang Namtha occur in April and May, averaging a high-temperature of 32°C (89.6°F).
• Muang Pa - May »
  On the last day of the month, in Muang Pa sunrise is at 05:36 and sunset at 18:46 +07. In Muang Pa, Laos, during the entire year, the rain falls for 183.9 days and collects up to 818mm (32.2") of precipitation.