The best time to visit Chiang Rai is in the winter months of December to February because the climate becomes rainless and appropriate to go sightseeing and trekking. One should also be carrying a good amount of winter clothing to be careful because it might become freezing after 9pm in the city. The months of April to June are the worst months to visit Chiang Rai because it's extremely humid and sightseeing would be very uncomfortable. Although, it is also important to keep in mind that the winter months will be crowded with tourists because that is the peak season.
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