Weather in Trieste

Planning a trip or simply curious about the weather in Trieste? Here you will find the latest information on weather conditions, as well as detailed forecasts and clear charts.

The climate in Trieste, located in Italy, is temperate with four distinct seasons. Travellers can expect warm, and at times hot, summers and relatively mild, cool winters. Spring and autumn offer pleasant transitional periods with moderate temperatures, perfect for walking and exploring the city.

The summer months, particularly from June to August, are characterised by the highest temperatures, with averages hovering around 20-23°C and maximums reaching 27°C. This is the sunniest time of the year. The winter period, from December to February, brings cool weather with average temperatures around 4-6°C. Although severe frosts are not typical for Trieste, the weather can be quite humid. Precipitation is distributed throughout the year, though it is worth noting that May sees the highest number of rainy days (about 18 days), while September and November may bring slightly higher total rainfall.

Overall, the weather in Trieste offers a pleasant variety. For a summer visit, light clothing and sun protection are suitable. In spring and autumn, it is recommended to carry a light jacket or sweater, as well as an umbrella in case of rain. In winter, warmer clothing will be required to comfortably enjoy walks around this charming city.

Trieste experiences a noticeable shift in temperatures throughout the year, which is characteristic of its geographical location. The coldest month is usually January, with an average temperature of around 4.4°C. During this period, nighttime lows can drop to an average of 1.7°C, while daytime highs rarely exceed 7.0°C. Conversely, the hottest period is considered to be August, when the average temperature reaches 23.3°C, with daytime peaks up to 27.3°C and comfortable nighttime temperatures around 19.4°C. July is also very warm, with similar figures, only slightly trailing behind August.

The summer months in Trieste, covering the period from June to August, are characterised by pleasantly warm, and often hot weather. Average daytime temperatures in July and August confidently stay above 26-27°C, creating excellent conditions for beach holidays and long walks around the city. Nights also remain warm, with temperatures rarely falling below 17-19°C. June serves as a transition to the summer heat, with an average maximum of around 24.6°C and an average temperature of 20.9°C.

Winter in Trieste, lasting from December to February, is distinguished by cool but generally mild weather. Average temperatures during this season range from 4.4°C in January to 5.7°C in February. Although nighttime temperatures can approach freezing (average low in January is 1.7°C, in December 3.0°C), severe frosts are not typical. Daytime highs in the winter period usually average around 7-9°C. It is worth noting that fluctuations between day and night temperatures exist throughout the year, averaging 5-8°C. This means that even after a hot summer day, the evening can bring a pleasant coolness.

In Trieste, precipitation is observed year-round, though its intensity and frequency vary. There is no clearly defined dry season, but periods with higher and lower rainfall can be distinguished. The city receives the most moisture in autumn: September is the wettest month, with an average of 7 mm of precipitation, followed by November with 6 mm. Relatively dry in terms of precipitation volume (about 3 mm) are the winter months (January, February, March) and summer months (June, July, August).

Regarding the frequency of rain, the picture is somewhat different. The record holder for the number of rainy days is May, when it rains on average for 18 days. This suggests frequent but perhaps not very heavy rains, considering that the total precipitation in May is 5 mm. There are also quite a few rainy days in November (about 13) and generally in the period from October to December (about 12-13 days per month). The lowest number of rainy days falls on February – about 9 days.

Most precipitation in Trieste falls as rain. Given the mild climate and average winter temperatures that usually remain above freezing (minimum average temperature in January is +1.7°C), snowfall here is a rare and uncharacteristic phenomenon. Travellers should be prepared for rain at practically any time of the year, but especially in May regarding frequency and in autumn regarding intensity.

When planning a trip to Trieste, it is important to consider its seaside location and changeable weather, especially the influence of winds such as the famous Bora. Regardless of the season, a key element of your luggage should be comfortable walking shoes, as the city invites long explorations of its streets and waterfront. The principle of layering clothing is your best ally in Trieste. A light windbreaker or raincoat and a compact umbrella will come in handy almost always, as precipitation, although not always heavy, occurs quite often throughout the year.

In summer (from June to August), it is warm and sunny in Trieste. Pack light clothing made from natural fabrics, swimwear, sunglasses, a hat, and high SPF cream. However, even in the summer months, evening coolness or a sudden sea breeze may require a light jacket or cardigan. In winter (from December to February), the weather can be quite cold, with average temperatures around 4-6°C, which may feel lower due to the wind. Be sure to take a warm, windproof, and preferably waterproof jacket, sweaters, warm trousers, a hat, a scarf, and gloves. Waterproof shoes will also be very useful.

Spring (March-May) and autumn (September-November) in Trieste are transitional seasons with changeable weather. During this time, layering is particularly relevant: t-shirts, long-sleeved shirts, jumpers, and a mid-season jacket capable of protecting against rain and wind. In early spring and late autumn, the weather is closer to winter, whereas in May and September it can still be quite warm. Given that in May, for example, there can be up to 18 days with precipitation, and rains are also frequent in September and November, a reliable umbrella or raincoat will become your faithful companions.