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Like all of Thailand, Nong Khai has three seasons: the "cool" season from November to February, the "hot" season from March to May, and the "rainy" season from June to October. The cool season is the traditional time to visit, but it's also when sights will be the most crowded, and hotel rates the highest. Conventional wisdom has it that the rainy season is the worst time to come, but this is not necessarily true. The rains generally occur in short, sometimes violent, cloudbursts which usually come in the late afternoon. If you plan your day accordingly, you can do your sightseeing in the morning, and be relaxing in a spa when the rains arrive.
There is no regularly reporting weather station in Nong Khai. The information shown here is for the Lao capital of Vientiane, across the river from Nong Khai. See Weather Underground for more detailed forecast information.
Six-Day Nong Khai Weather Forecast
Historical Weather Information
As you can see, the "cool" season is not really that cold. At most, you might feel the need for a light sweater at night. While April is the hottest month, this is also the month when the traditional Thai new year, Songkran, is celebrated.
