September weather forecastBologna, Italy
September
Weather in September
Bologna sees a substantial drop in temperature in September, as it descends to a maximum of 25.3°C (77.5°F). Signalling the start of autumn, September guarantees an increase in the relative humidity to 67%. Despite the decline in temperature from August, there is a continuation of warm and clear weather conditions. The city adorns itself in shades of brown and orange, delivering an undeniably picturesque image to its visitors.Temperature
Start of September in Bologna brings a shift in the average high-temperature, falling from August's tropical 31.3°C (88.3°F) to a moderately hot 25.3°C (77.5°F). An average nighttime temperature of 14.9°C (58.8°F) is witnessed in Bologna throughout September.Humidity
The average relative humidity in September is 67%.Rainfall
In Bologna, during September, the rain falls for 10.3 days and regularly aggregates up to 37mm (1.46") of precipitation. Throughout the year, in Bologna, there are 128.5 rainfall days, and 464mm (18.27") of precipitation is accumulated.Snowfall
April through November are months without snowfall in Bologna.Daylight
In September, the average length of the day is 12h and 31min.On the first day of the month, sunrise is at 06:37 and sunset at 19:51. On the last day of September, sunrise is at 07:11 and sunset at 18:57 CEST.
Sunshine
The average sunshine in September is 10.2h.UV index
The average daily maximum UV index in September is 5. A UV Index reading of 3 to 5 represents a moderate threat to health from exposure to the Sun's UV radiation for the ordinary person.Note: The maximum daily UV index of 5 in September converts into the following recommendations:
Exercise caution. The susceptibility of light skin individuals to burns is less than 30 minutes. Exposing oneself to the midday Sun can be harmful due to the strong UV radiation; limit your time outside. Employ a wide-brim hat for potent defense against up to 50% of UV rays.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Bologna, Italy
- Average high temperature in September: 25.3°C
The warmest month (with the highest average high temperature) is August (31.3°C).
The month with the lowest average high temperature is January (7.1°C).
- Average low temperature in September: 14.9°C
The month with the highest average low temperature is August (18.6°C).
The coldest month (with the lowest average low temperature) is January (1.3°C).
Average pressure in September
Bologna, Italy
- Average pressure in September: 1015.9mbar
The month with the highest atmospheric pressure is December (1018.9mbar).
The month with the lowest atmospheric pressure is July (1013.7mbar).
Average wind speed in September
Bologna, Italy
- Average wind speed in September: 7.5km/h
The windiest month (with the highest average wind speed) is March (8.8km/h).
The calmest month (with the lowest average wind speed) is December (6.5km/h).
Average humidity in September
Bologna, Italy
- Average humidity in September: 67%
The month with the highest relative humidity is November (82%).
The month with the lowest relative humidity is August (58%).
Average rainfall in September
Bologna, Italy
- Average rainfall in September: 37mm
The wettest month (with the highest rainfall) is November (60mm).
The driest month (with the least rainfall) is January (26mm).
Average rainfall days in September
Bologna, Italy
- Average rainfall days in September: 10.3 days
The month with the highest number of rainy days is May (14.7 days).
The month with the least rainy days is January (8.2 days).
Average snowfall in September
Bologna, Italy
- Average snowfall in September: 0mm
The month with the highest snowfall is February (32mm).
The months with the least snowfall are April, May, June, July, August, September, October and November (0mm).
Average snowfall days in September
Bologna, Italy
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (1.5 days).
The months with the least snowfall days are April, May, June, July, August, September, October and November (0 days).
Average daylight in September /
Average sunshine in September
Bologna, Italy
- Average daylight in September: 12h and 30min
The month with the longest days is June (Average daylight: 15h and 30min).
The month with the shortest days is December (Average daylight: 8h and 54min).
- Average sunshine in September: 10h and 12min
The month with the most sunshine is July (Average sunshine: 11h and 42min).
The month with the least sunshine is February (Average sunshine: 5h and 18min).
Average sunshine days in September
Bologna, Italy
- Average sunshine days in September: 17.7 days
The month with the most sunshine days is January (20.8 days).
The month with the least sunshine days is May (12.5 days).
Average UV index in September
Bologna, Italy
- Average UV index in September: 5
The month with the highest UV index is July (UV index 7).
The months with the lowest UV index are January, November and December (UV index 2).
Average cloud cover in September
Bologna, Italy
- Average cloud cover in September: 23
The month with the most cloud cover is February (Cloud cover 44).
The month with the least cloud cover is August (Cloud cover 16).
Average visibility in September
Bologna, Italy
- Average visibility in September: 10km
The months with the highest visibility are June, July, August and September (10km).
The months with the lowest visibility are January, February, March, April, May, October, November and December (9km).
