Trieste, on Italy’s Adriatic coast, enjoys a temperate oceanic climate with warm, sunny summers and mild, wetter winters. The city experiences abundant sunshine, moderate to high rainfall, and the dramatic Bora wind in winter. Seasonal changes are pronounced, making Trieste a vibrant destination for both beachgoers and cultural explorers throughout the year.
The best times to travel section shows how the months compare for a visit, so you can find the time of year that fits what you want to do.
Background colours of the months:
The colour shows the typical temperature: yellow (hot), green (mild) and blue (cold). How strong the colour is shows the travel season: full colour means high season, soft colour means shoulder season and soft-striped means off season.
Weather symbols:
Each month has one symbol showing what the weather is typically like, such as hot and sunny, freezing or a rainy or snowy season. Use them to quickly spot months that match the weather you want, or to avoid the ones that don't.
Crowdedness:
The people icon shows how busy the place usually is. The more people, the more crowded it gets.
Additional notes:
The grey info boxes point out special things worth knowing, like recurring weather issues or seasonal events.
Trieste’s climate is shaped by its coastal location and the influence of both Mediterranean and Central European weather patterns. Summers (June–August) are warm and mostly sunny, with average highs of 25–29°C and nighttime lows around 16–20°C. July and August are the hottest months, sometimes reaching up to 34°C, while humidity remains moderate. Rainfall is moderate in summer, with brief thunderstorms possible, but dry, sunny days are the norm. The Adriatic Sea warms to 25–26°C in July and August, making swimming and water sports popular. Sunshine peaks in summer, with up to 10–11 hours daily and daylight lasting over 15 hours at the solstice.
Winters (December–February) are mild by European standards, with highs of 7–9°C and lows near 2–4°C. Snow is rare, but rain is common, especially in November and December, the wettest months. Winter can also bring the Bora, a strong, cold northeast wind that can dramatically lower temperatures and increase the wind chill. Spring and autumn are transitional, with spring warming from 12°C in March to 21°C in May and autumn cooling from 24°C in September to 13°C in November. Rainfall is spread throughout the year, with annual totals around 1,000–1,500 mm and 120–135 rainy days. Trieste enjoys 2,000–2,100 hours of sunshine annually, with long, bright days in summer and 4–5 hours of sun even in winter. The city’s microclimate means weather can change quickly, so visitors should be prepared for both sun and showers, especially in spring and autumn.
| Average climate data for Trieste, Italy | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Month | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Year |
| Average maximum temperature (°C) | 6 | 7 | 11 | 16 | 19 | 24 | 27 | 27 | 22 | 17 | 12 | 8 | 27 |
| Average minimum temperature (°C) | 2 | 2 | 5 | 9 | 11 | 15 | 18 | 18 | 14 | 10 | 7 | 3 | 2 |
| Average precipitation (mm) | 54 | 83 | 69 | 61 | 99 | 99 | 83 | 78 | 106 | 73 | 128 | 81 | 1,015 |
| Average rainfall days (days) | 11 | 12 | 13 | 16 | 21 | 18 | 17 | 14 | 15 | 14 | 16 | 12 | 178 |
| Average snowfall (mm) | 10 | 14 | 6 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 9 | 39 |
| Average snowfall days (days) | 1 | 1 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 4 |
| Average relative humidity (%) | 80 | 79 | 76 | 72 | 75 | 71 | 70 | 67 | 74 | 78 | 83 | 79 | 75 |
| Average wind speed (km/h) | 10 | 12 | 11 | 10 | 9 | 9 | 9 | 9 | 10 | 10 | 11 | 9 | 10 |
| Average water temperature (°C) | 10 | 9 | 10 | 13 | 18 | 23 | 25 | 25 | 23 | 19 | 16 | 13 | 17 |
| Average daily daylight hours (h) | 9 | 10 | 11 | 13 | 14 | 15 | 15 | 14 | 12 | 10 | 9 | 8 | 12 |
| Average daily sunshine hours (h) | 5 | 5 | 7 | 9 | 10 | 11 | 11 | 11 | 10 | 6 | 5 | 5 | 8 |
| Average cloud coverage (%) | 46 | 50 | 41 | 35 | 35 | 26 | 22 | 19 | 29 | 36 | 47 | 44 | 36 |
| Average UV index | 2 | 3 | 3 | 4 | 5 | 6 | 6 | 5 | 4 | 3 | 2 | 2 | 4 |
The best time to visit Trieste is from May to September, when temperatures are warm (21–29°C), rainfall is moderate, and the sea is perfect for swimming. These months offer abundant sunshine, long days, and a lively atmosphere with festivals and outdoor activities along the Adriatic coast.
The least favourable time to visit is from November to February, when Trieste is at its wettest and windiest. Rain is frequent, the Bora wind can bring sudden cold spells, and daylight is limited, though the city’s cultural sites and cafés remain welcoming for off-season travellers.
Trieste has a temperate oceanic climate with warm, sunny summers (25–29°C), mild, wetter winters (7–9°C), and rainfall spread throughout the year. The city enjoys abundant sunshine and occasional strong Bora winds in winter.
The best time to visit is from May to September, when temperatures are warm, the sea is swimmable, and the city hosts many festivals and outdoor events. Spring and autumn are also pleasant for sightseeing.
Snow is rare in Trieste. Winters are mild, with most precipitation falling as rain. When snow does occur, it is usually light and melts quickly.
Trieste receives about 1,000–1,500 mm of rain annually, with the wettest months being November and December. Rain can fall in any season, but summer is generally drier with occasional thunderstorms.
The Bora is a strong, cold northeast wind that can reach speeds over 100 km/h in winter. It brings clear, cold weather and can make winter days feel much colder due to wind chill.
Yes, the best months for swimming and beach activities are June to September, when sea temperatures reach 25–26°C and days are long and sunny.
Pack light, breathable clothing and sun protection for summer. In spring and autumn, bring layers and a rain jacket. For winter, warm, windproof clothing is essential due to rain and the Bora wind.
The warmest month, with the highest average maximum temperature, is August (27.3 °C). The month with the lowest average maximum temperature is January (5.9 °C). Overall, the average maximum temperature over the whole year is 16.2 °C.
The month with the highest average minimum temperature is August (18 °C). The coldest month, with the lowest average minimum temperature, is January (1.5 °C). Overall, the average minimum temperature over the whole year is 9.5 °C.
The month with the highest average water temperature is August (24.8 °C). The month with the lowest average water temperature is February (9.4 °C). Overall, the average water temperature over the whole year is 17.1 °C.
The wettest month, with the highest amount of precipitation, is November (127.9 mm). The driest month, with the least amount of precipitation, is January (54.5 mm). Over the whole year there are 1,015.5 mm of rainfall on average.
The month with the most days of rain is May (21.4 days). The month with the fewest days of rain is January (10.8 days). Over the whole year there are 178.1 days of rain on average.
The month with the most snowfall is February (14.2 mm). The months with the least snowfall are April, May, June, July, August, September, October and November (0 mm). Over the whole year there are 39 mm of snowfall on average.
The month with the most days of snowfall is January (1.1 days). The months with the fewest days of snowfall are April, May, June, July, October and November (0 days). Over the whole year there are 3.5 days of snowfall on average.
The month with the highest average relative humidity is November (83.2 %). The month with the lowest average relative humidity is August (67.2 %). The overall average relative humidity over the whole year is 75.3 %.
The windiest month, with the highest average wind speed, is February (11.8 km/h). The calmest month, with the lowest average wind speed, is August (8.5 km/h). The overall average wind speed over the whole year is 9.7 km/h.
The month with the cloudiest skies, so the highest cloud coverage, is February (49.5 %). The month with the clearest skies, so the lowest cloud coverage, is August (19.4 %). Over the whole year there is an average cloud coverage of 35.9 %.
The month with the longest days, so the most daylight, is June (Average daylight: 15.1 h). The month with the shortest days, so the least daylight, is December (Average daylight: 8.1 h). Over the whole year there are 11.7 h of daylight per day on average.
The month with the most sunshine per day is July (Average sunshine: 11.2 h). The month with the least sunshine per day is November (Average sunshine: 4.9 h). Over the whole year there are 8 h of sunlight per day on average.
The months with the highest average UV index are June and July (UV index: 6). The months with the lowest average UV index are January, November and December (UV index: 2). Over the whole year the average UV index is 3.8.
