Contents
- Weather in September
- Frequently asked questions
- Average temperature in September
- Average pressure in September
- Average wind speed in September
- Average humidity in September
- Average rainfall in September
- Average rainfall days in September
- Average snowfall in September
- Average snowfall days in September
- Average sea temperature in September
- Average daylight in September
- Average sunshine in September
- Average sunshine days in September
- Average UV index in September
- Average cloud cover in September
- Average visibility in September
Weather in September
Temperature
Vieste's September weather features a light decline in high-temperatures, reducing from 28.6°C (83.5°F) in August to a still moderately hot 24.7°C (76.5°F). Vieste experiences a subtle drop in temperature during the September nights, recording an average of 20.6°C (69.1°F).Humidity
The average relative humidity in September is 65%.Rainfall
In September, the rain falls for 9.2 days. Throughout September, 33mm (1.3") of precipitation is accumulated. Throughout the year, there are 143.2 rainfall days, and 526mm (20.71") of precipitation is accumulated.Snowfall
In Vieste, snow does not fall in May through November.Sea temperature
In September, the average sea temperature is 24.3°C (75.7°F).Note: The cold tolerance of an individual, along with sunshine, wind, and the temperature of the environment, affects the enjoyment of swimming in 24.3°C (75.7°F) waters. (Olympic swimmers participate in waters ranging from 25°C (77°F) to 28°C (82.4°F).)
Daylight
In September, the average length of the day is 12h and 29min.On the first day of the month, sunrise is at 06:21 and sunset at 19:28. On the last day of September, sunrise is at 06:51 and sunset at 18:38 CEST.
Sunshine
In Vieste, Italy, the average sunshine in September is 10.8h.UV index
In September, the average daily maximum UV index is 6. A UV Index estimate of 6 to 7 represents a high health risk from unsafe exposure to UV radiation for the average person.Note: The UV index of 6 during September leads to these advisories:
Escape overexposure. People with light skin may incur burns in fewer than 20 minutes. During the period from 10 a.m. to 4 p.m., UV radiation is highest. Try to avoid direct sunlight during these hours. Sunglasses providing both UVA and UVB protection are non-negotiable on sunlit days. Stay cautious! Sand and water reflections increase UV radiation potency.
Frequently asked questions
What is the average September temperature in Vieste?
What is the average humidity in September in Vieste?
How many days does it rain in September in Vieste?
When it does not snow in Vieste?
How warm is the water in September in Vieste?
What is the average length of the day in September in Vieste?
What time are sunrise and sunset in September in Vieste?
How long on average sun shines in September in Vieste?
How high is the UV index in September in Vieste?
Average temperature in September
Vieste, Italy
- Average high temperature in September: 24.7°C
The warmest month (with the highest average high temperature) is August (28.6°C).
The month with the lowest average high temperature is January (11.4°C).
- Average low temperature in September: 20.6°C
The month with the highest average low temperature is August (23.8°C).
The coldest months (with the lowest average low temperature) are January and February (7.8°C).
Average pressure in September
Vieste, Italy
- Average pressure in September: 1015.1mbar
The month with the highest atmospheric pressure is December (1017.9mbar).
The month with the lowest atmospheric pressure is July (1013.1mbar).
Average wind speed in September
Vieste, Italy
- Average wind speed in September: 12.2km/h
The windiest month (with the highest average wind speed) is February (17.7km/h).
The calmest month (with the lowest average wind speed) is August (11.4km/h).
Average humidity in September
Vieste, Italy
- Average humidity in September: 65%
The month with the highest relative humidity is November (75%).
The month with the lowest relative humidity is July (60%).
Average rainfall in September
Vieste, Italy
- Average rainfall in September: 33mm
The wettest month (with the highest rainfall) is November (71mm).
The driest month (with the least rainfall) is August (13mm).
Average rainfall days in September
Vieste, Italy
- Average rainfall days in September: 9.2 days
The month with the highest number of rainy days is January (15.7 days).
The month with the least rainy days is August (5.8 days).
Average snowfall in September
Vieste, Italy
- Average snowfall in September: 0mm
The month with the highest snowfall is January (9mm).
The months with the least snowfall are May, June, July, August, September, October and November (0mm).
Average snowfall days in September
Vieste, Italy
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (0.9 days).
The months with the least snowfall days are May, June, July, August, September, October and November (0 days).
Average sea temperature in September
Vieste, Italy
- Average sea temperature in September: 24.3°C
The best months for swimming (with the highest average sea temperature) are July and August (25.3°C).
The coldest month (with the lowest average sea temperature) is January (13.6°C).
Average daylight in September /
Average sunshine in September
Vieste, Italy
- Average daylight in September: 12h and 3min
The month with the longest days is June (Average daylight: 15h and 12min).
The month with the shortest days is December (Average daylight: 9h and 12min).
- Average sunshine in September: 10h and 5min
The months with the most sunshine are July and August (Average sunshine: 12h and 0min).
The month with the least sunshine is January (Average sunshine: 5h and 48min).
Average sunshine days in September
Vieste, Italy
- Average sunshine days in September: 18.4 days
The month with the most sunshine days is August (22.9 days).
The month with the least sunshine days is January (12.2 days).
Average UV index in September
Vieste, Italy
- Average UV index in September: 6
The months with the highest UV index are July and August (UV index 7).
The months with the lowest UV index are January and December (UV index 3).
Average cloud cover in September
Vieste, Italy
- Average cloud cover in September: 18
The month with the most cloud cover is January (Cloud cover 39).
The month with the least cloud cover is August (Cloud cover 9).
Average visibility in September
Vieste, 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).
Vieste, Italy
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