September welcomes the beautiful fall season to Oklahoma with a drop in temperatures and humidity. The hot and humid air masses from the south frequently interact with the cold air from the north to bring drastic changes in the weather. September is the second maxima of precipitation in the state that yields 3" (76mm) to 6" (152mm) of rainfall. From the peak of the summer, temperatures drop to average between 83°F (28.3°C) to 87°F (30.6°C) during the day. Nights are comfortable in the 54°F (12.2°C) to 62°F (16.7°C) range. Tulsa in the east lies in the warm zone of 62°F (16.7°C) to 84°F (28.9°C), while Elk City in the west records warm temperatures between 59°F (15°C) to 84°F (28.9°C). Early fall has plenty of sunshine as the rain lasts for 6 to 8 days in the month. The leaves start to change colors by mid-September, and the landscape alters radically. The winds are perfect for hot-air balloon races and rides such as those at the Poteau Balloon fest in eastern Oklahoma in September.