Climate Insights for Trieste

The climate in Trieste is temperate. The average annual temperature is 14°C and approximately 1573mm of precipitation falls per year. Trieste receives a notable amount of rainfall throughout the year, including during its driest month. Trieste is in the Northern Hemisphere. Summer begins at the end of June and lasts through September. The summer months are: August, July, June. The coldest months are January, February, December, when temperatures can drop to 2°C. Light snow can occur between January and December.

Temperatures in Trieste vary considerably across the year, with a 25°C difference between the coldest and warmest months. The warmest month is August, when average highs reach 27°C and the mean temperature sits around 23°C. January is the coolest month, with minimum temperatures around 2°C and an average of 4°C. Daily temperature variation is modest, with an average difference of 6°C between highs and lows. The sharpest temperature change occurs between May and June, with a 5°C shift in average temperatures.

Trieste is a fairly wet location, receiving approximately 1573mm of precipitation annually, which averages out to around 131mm per month. The wettest month is September, averaging 199mm of rainfall. November and October also tend to see above-average precipitation. The driest month is July, with just 94mm. That's 105mm less than September, the wettest month. Rainfall is relatively evenly distributed throughout the year, so there is no pronounced dry or wet season to plan around. Light snowfall can occur between January and December, totalling around 29cm annually. January is the snowiest month with approximately 8cm.

Trieste is relatively calm, with an average annual wind speed of 10km/h. For context, sustained winds below 12km/h are generally light, while anything above 25km/h is considered strong. The windiest month is November, averaging 12km/h, though still comfortable for most outdoor activities. The calmest conditions occur in July, with average winds dropping to 8km/h, making it an ideal period for wind-sensitive activities. There is moderate seasonal variation in wind speed, with a 4km/h gap between the calmest and windiest months.

It is currently summer in Trieste, which began on June 21, 2026. Trieste is in the Northern Hemisphere, where spring begins in March, summer in June, autumn in September, and winter in December. The warmest period peaks in August at around 27°C, while the coldest stretch bottoms out in January near 2°C. Autumn is next, beginning on September 23, 2026 (7 days from now).

The best time to visit Trieste is during July, when the weather is most comfortable for travellers. During these months, average temperatures hover around 23°C with modest rainfall averaging 94mm per month. By contrast, August can be uncomfortably hot with highs reaching 27°C, while January is the coldest period with lows dropping to 2°C. Despite being the best months overall, some rain is still likely. Pack a waterproof layer and plan a mix of indoor and outdoor activities.

The table below shows monthly climate averages for Trieste based on historical weather data. Min and max temperatures represent typical overnight lows and afternoon highs for each month, shown in degrees Celsius (°C). Precipitation is measured in millimetres (mm) and indicates the average total rainfall per month. Snow is measured in centimetres (cm) and reflects average monthly snowfall accumulation. Wind speed is the average sustained speed in kilometres per hour (km/h). All values are based on averages from over 10 years of historical weather data. The current month is highlighted for quick reference.