Weather at Chiang Rai Airport
The weather in Chiang Rai is generally warm and tropical throughout the year. The 'cool' dry season is from November to February, when nights can sometimes get quite cold, and this is also the tourist high season. Starting in February, the days, and nights, will become increasingly warmer until around April, when occasional daytime highs can easily reach 40°C / 100°F. Rains will start to fall in April and May, with the rainy season reaching its height July through September. Note that rains typically come in heavy late afternoon thunderstorms. Mornings can be clear and sunny.
Five-Day Weather Forecast for Chiang Rai
Weather information provided by Weather Underground.