The best time to visit That Phanom is during the cool, dry season, which runs from November to February.During these months, you'll experience pleasant temperatures, typically ranging from 20°C to 30°C, making it comfortable for exploring the town and its surroundings. There's very little rain, ensuring clear skies for sightseeing. This period is ideal for those who want to comfortably visit the revered Wat Phra That Phanom and enjoy boat trips on the Mekong River.The shoulder seasons, March to May and September to October, can also be good, though they tend to be warmer or have a higher chance of rain. March to May sees temperatures rise significantly, sometimes exceeding 35°C, which might be less comfortable for some travellers.