The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. Take precautions - Protection against sun damage is advised. Note: The daily maximum UV index of 4 in September interpret into the following advice: A UV Index value of 3 to 5 symbolizes a moderate threat to health from exposure to the Sun's UV rays for ordinary individuals. UV indexIn Vienna, the average daily maximum UV index in September is 4. SunshineIn September, the average sunshine in Vienna is 6.1h. On the last day of September, sunrise is at 06:52 and sunset at 18:36 CEST. On the first day of the month, sunrise is at 06:12 and sunset at 19:36. DaylightIn Vienna, the average length of the day in September is 12h and 35min. SnowfallIn Vienna, snow does not fall in May through October. Throughout the year, in Vienna, there are 88 rainfall days, and 547.9mm (21.57") of precipitation is accumulated.
Throughout September, 50.4mm (1.98") of precipitation is accumulated. Rainfall In September, in Vienna, the rain falls for 6.9 days. In September, the average low-temperature is 13.6☌ (56.5☏).
TemperatureIn September, the average high-temperature drops from a moderately hot 26.6☌ (79.9☏) in August to an agreeable 21.1☌ (70☏). The first month of the autumn, September, is still a pleasant month in Vienna, Austria, with an average temperature ranging between min 13.6☌ (56.5☏) and max 21.1☌ (70☏).