Roi Et (ROI) experiences its lowest average temperature in December, at 74.5°F (23.6°C), while April is the hottest month, with an average temperature of 87.1°F (30.6°C). September is typically the wettest month. If you’re looking to soak up the lively atmosphere at Roi Et (ROI), March, April, and September are the peak months to visit, bustling with fellow travelers. During this peak period, the weather is mostly sunny to mostly cloudy, accompanied by dry to frequent rainfall. However, if you prefer a more relaxed experience, May, August, and November are perfect for a quieter getaway, marked by dry to moderate rainfall and mostly sunny to mostly cloudy conditions.