September weather forecastVentotene, Italy
September
Weather in September
September, the first month of the autumn in Ventotene, is still a warm month, with an average temperature varying between 24.9°C (76.8°F) and 21.9°C (71.4°F).Temperature
With September's arrival, Ventotene's weather records an average high-temperature of a still moderately hot 24.9°C (76.8°F), marking little difference from August's 27.7°C (81.9°F). Ventotene documents an average low-temperature of 21.9°C (71.4°F) for the nights of September.Humidity
September is the least humid month, with an average relative humidity of 66%.Rainfall
In Ventotene, in September, it is raining for 12.8 days, with typically 63mm (2.48") of accumulated precipitation. Throughout the year, in Ventotene, there are 147.3 rainfall days, and 680mm (26.77") of precipitation is accumulated.Snowfall
In Ventotene, snow does not fall in January, March through December.Sea temperature
In September, the average sea temperature is 24.6°C (76.3°F).Note: For individuals prone to feeling cold, swimming in 23°C (73.4°F) is still regarded as intolerable. A wetsuit is not a necessity, but sunshine, wind, and air temperature are essential factors for relishing swimming at 24.6°C (76.3°F).
Daylight
In Ventotene, the average length of the day in September is 12h and 28min.On the first day of September, sunrise is at 06:33 and sunset at 19:38. On the last day of the month, sunrise is at 07:02 and sunset at 18:49 CEST.
Sunshine
In Ventotene, the average sunshine in September is 10.9h.UV index
The average daily maximum UV index in September is 6. A UV Index value of 6 to 7 symbolizes a high health vulnerability from unprotected exposure to Sun's UV rays for the average person.Note: A daily high UV index of 6 in September leads to these guidelines:
Refrain from overexposure. Fair-skinned individuals could burn in under 20 minutes. Minimize exposure to direct sunlight and seek shade from 10 a.m. to 4 p.m., when UV radiation is most intense, but remember that shade structures may not offer complete protection. A wide-brimmed hat is a staple for defending the face, eyes, ears, and neck from the Sun. Heads up! The reflection of sand and water notably intensifies UV rays from the Sun.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Ventotene, Italy
- Average high temperature in September: 24.9°C
The warmest month (with the highest average high temperature) is August (27.7°C).
The month with the lowest average high temperature is January (12.8°C).
- Average low temperature in September: 21.9°C
The month with the highest average low temperature is August (24.7°C).
The coldest month (with the lowest average low temperature) is February (10.1°C).
Average pressure in September
Ventotene, Italy
- Average pressure in September: 1015.7mbar
The month with the highest atmospheric pressure is December (1018.5mbar).
The month with the lowest atmospheric pressure is April (1014mbar).
Average wind speed in September
Ventotene, Italy
- Average wind speed in September: 13.3km/h
The windiest month (with the highest average wind speed) is February (18.7km/h).
The calmest month (with the lowest average wind speed) is August (11.2km/h).
Average humidity in September
Ventotene, Italy
- Average humidity in September: 66%
The months with the highest relative humidity are March, April and May (72%).
The month with the lowest relative humidity is September (66%).
Average rainfall in September
Ventotene, Italy
- Average rainfall in September: 63mm
The wettest month (with the highest rainfall) is November (140mm).
The driest month (with the least rainfall) is August (11mm).
Average rainfall days in September
Ventotene, Italy
- Average rainfall days in September: 12.8 days
The month with the highest number of rainy days is November (17.3 days).
The month with the least rainy days is August (4.2 days).
Average snowfall in September
Ventotene, Italy
- Average snowfall in September: 0mm
The month with the highest snowfall is February (1mm).
The months with the least snowfall are January, March, April, May, June, July, August, September, October, November and December (0mm).
Average snowfall days in September
Ventotene, Italy
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (0.1 days).
The months with the least snowfall days are January, March, April, May, June, July, August, September, October, November and December (0 days).
Average sea temperature in September
Ventotene, Italy
- Average sea temperature in September: 24.6°C
The best month for swimming (with the highest average sea temperature) is August (25.6°C).
The coldest month (with the lowest average sea temperature) is February (13.9°C).
Average daylight in September /
Average sunshine in September
Ventotene, Italy
- Average daylight in September: 12h and 30min
The month with the longest days is June (Average daylight: 15h and 6min).
The month with the shortest days is December (Average daylight: 9h and 18min).
- Average sunshine in September: 10h and 54min
The month with the most sunshine is July (Average sunshine: 12h and 6min).
The month with the least sunshine is January (Average sunshine: 5h and 36min).
Average sunshine days in September
Ventotene, Italy
- Average sunshine days in September: 15.3 days
The months with the most sunshine days are July and August (23.3 days).
The month with the least sunshine days is November (11.2 days).
Average UV index in September
Ventotene, Italy
- Average UV index in September: 6
The months with the highest UV index are July and August (UV index 7).
The month with the lowest UV index is January (UV index 3).
Average cloud cover in September
Ventotene, Italy
- Average cloud cover in September: 19
The month with the most cloud cover is January (Cloud cover 40).
The month with the least cloud cover is August (Cloud cover 8).
Average visibility in September
Ventotene, Italy
- Average visibility in September: 10km
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (10km).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (10km).
