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
The shift from August to September in Trieste involves a decrease in the average high-temperature, from a warm 27.2°C (81°F) to a pleasant 21.8°C (71.2°F). Trieste, during the month of September, experiences an average low-temperature of 14.4°C (57.9°F).Humidity
The average relative humidity in September is 74%.Rainfall
In Trieste, in September, it is raining for 14.6 days, with typically 106mm (4.17") of accumulated precipitation. In Trieste, during the entire year, the rain falls for 177.7 days and collects up to 1019mm (40.12") of precipitation.Snowfall
April through November are months without snowfall in Trieste.Sea temperature
In Trieste, in September, the average water temperature is 23.3°C (73.9°F).Note: For those not fond of cold temperatures, taking a swim at 23.3°C (73.9°F) may require consideration of the sunshine, wind, and ambient temperature. While wetsuits are not mandatory, they can enhance the experience.
Daylight
In September, the average length of the day is 12h and 32min.On the first day of September in Trieste, Italy, sunrise is at 06:26 and sunset at 19:42. On the last day of the month, sunrise is at 07:02 and sunset at 18:46 CEST.
Sunshine
The average sunshine in September is 10.1h.UV index
The average daily maximum UV index in September is 4. A UV Index value of 3 to 5 symbolizes a medium vulnerability from exposure to the Sun's UV radiation for the average person.Note: A daily high UV index of 4 in September leads to these guidelines:
Guard yourself - Avoiding sunburn is suggested. Considering the Sun's intensity during midday, it's wise to minimize direct exposure. For optimum UV protection, wear sun-resistant attire complemented with a hat and quality shades. Attention! The combination of sand and water reflections enhances UV ray intensity.
Frequently asked questions
What is the average September temperature in Trieste?
What is the average humidity in September in Trieste?
How many days does it rain in September in Trieste?
When it does not snow in Trieste?
What is the water temperature in September in Trieste?
How many hours of daylight does Trieste have in September?
When are sunrise and sunset in September in Trieste?
How long on average sun shines in September in Trieste?
What is the UV index reading in September in Trieste?
Average temperature in September
Trieste, Italy
- Average high temperature in September: 21.8°C
The warmest month (with the highest average high temperature) is August (27.2°C).
The month with the lowest average high temperature is January (5.9°C).
- Average low temperature in September: 14.4°C
The month with the highest average low temperature is August (18.1°C).
The coldest month (with the lowest average low temperature) is January (1.6°C).
Average pressure in September
Trieste, Italy
- Average pressure in September: 1017.1mbar
The month with the highest atmospheric pressure is December (1019.8mbar).
The months with the lowest atmospheric pressure are May, June and July (1014.7mbar).
Average wind speed in September
Trieste, Italy
- Average wind speed in September: 9.9km/h
The windiest month (with the highest average wind speed) is February (11.7km/h).
The calmest months (with the lowest average wind speed) are June, July and August (8.6km/h).
Average humidity in September
Trieste, Italy
- Average humidity in September: 74%
The month with the highest relative humidity is November (82%).
The month with the lowest relative humidity is August (68%).
Average rainfall in September
Trieste, Italy
- Average rainfall in September: 106mm
The wettest month (with the highest rainfall) is November (129mm).
The driest month (with the least rainfall) is January (54mm).
Average rainfall days in September
Trieste, Italy
- Average rainfall days in September: 14.6 days
The month with the highest number of rainy days is May (21.3 days).
The month with the least rainy days is January (10.9 days).
Average snowfall in September
Trieste, Italy
- Average snowfall in September: 0mm
The month with the highest snowfall is February (14mm).
The months with the least snowfall are April, May, June, July, August, September, October and November (0mm).
Average snowfall days in September
Trieste, Italy
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (1.2 days).
The months with the least snowfall days are April, May, June, July, August, September, October and November (0 days).
Average sea temperature in September
Trieste, Italy
- Average sea temperature in September: 23.3°C
The best months for swimming (with the highest average sea temperature) are July and August (24.8°C).
The coldest month (with the lowest average sea temperature) is February (9.3°C).
Average daylight in September /
Average sunshine in September
Trieste, Italy
- Average daylight in September: 12h and 3min
The month with the longest days is June (Average daylight: 15h and 36min).
The month with the shortest days is December (Average daylight: 8h and 48min).
- Average sunshine in September: 10h and 1min
The month with the most sunshine is July (Average sunshine: 11h and 30min).
The months with the least sunshine are February and November (Average sunshine: 5h and 0min).
Average sunshine days in September
Trieste, Italy
- Average sunshine days in September: 13.4 days
The month with the most sunshine days is January (17 days).
The month with the least sunshine days is May (6.6 days).
Average UV index in September
Trieste, Italy
- Average UV index in September: 4
The months with the highest UV index are June and July (UV index 6).
The months with the lowest UV index are January, November and December (UV index 2).
Average cloud cover in September
Trieste, Italy
- Average cloud cover in September: 28
The month with the most cloud cover is February (Cloud cover 49).
The month with the least cloud cover is August (Cloud cover 19).
Average visibility in September
Trieste, Italy
- Average visibility in September: 10km
The months with the highest visibility are April, May, June, July, August and September (10km).
The months with the lowest visibility are January, February, March, October, November and December (9km).
Trieste, Italy
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