September is warm in Austria at the beginning of the colorful autumn season. The average high temperatures are in the comfortable range of 12.8°C (55°F) to 21.1°C (70°F). Nights are cold to mild in the range of 3.3°C (37.9°F) to 11.7°C (53.1°F). The precipitation is to the tune of 76.2mm (3") to 152.4mm (6"), and the landscape is past the peak wetness of the summer. Much of the country receives between 160 hours to 190 hours of daily sunshine, with a small rise in humidity. The earliest sunrise occurs at 6.20 a.m. in Linz, and the latest sunset happens at 7.43 p.m. Vienna is occasionally sultry, with relative humidity between 60% and 70%. Innsbruck remains cloudy for 52% to 58% of the time. The land becomes colorful by the third week of September, and the conditions are pleasant. Expect few thunderstorms than the summer. A warm jacket or sweater is helpful in the cold evenings. September is one of the best times to visit Austria.