The highest day temperature in September 2023 was 88°F. The lowest night temperature was 55°F. The average values for day and night temperatures during September were 80.1°F и 63.0°F respectivly.

The average sea surface temperature in September 2023 for Trieste was 78.4°F. The maximum and minimum values were 76.2°F and 81.4°F respectively.

Most of the days in September are sunny but you can also expect cloudy and gloomy days.

Precipitation total in September for Trieste is 4.4 in. It makes september the most rainy month of the year.

The average wind speed in September is 5.7 mph. This value is relatively stable throughout the year.

We are using day length and cloud cover information for each day of the month to calculate averages for this chart. Average sunny hours for Trieste in September is 9.1 hours.