Loei lies in the fertile valley of the Loei River, which runs from south to north through the eastern part of the town. A range of hills lies to the east, including the Phu Bo Bit Park, about 3 kilometres (1.9 mi) from the town center. Loei has a tropical savanna climate (Köppen climate classification Aw). Winters are quite dry and very warm. Temperatures rise until April, which is hot with the average daily maximum at 35.9 °C (96.6 °F). The monsoon season runs from late April through October, with heavy rain and somewhat cooler temperatures during the day, although nights remain warm.