weather in trieste
Trieste: Annual Weather Averages. July is the hottest month in Trieste with an average temperature of 24Â°C (75Â°F) and the coldest is January at 5Â°C (41Â°F) with the most daily sunshine hours at 9 in August. The wettest month is October with an average of 130mm of rain. Average Temperature: Trieste. Loading weather data.