Climate and monthly weather forecastTrieste, Italy
Climate and monthly weather forecast
The climate of Trieste
The city of Trieste, located in the northeastern region of Italy, experiences a predominate marine west coast climate, also known as a warm summer climate according to the Köppen climate classification. This Cfb climate classification is characterized by consistent rainfall months throughout the year, although specific conditions vary.Despite the city's proximity to the Mediterranean, it doesn't share its hot, dry summers; instead, Trieste experiences warm and reasonably temperate weather paired with a high level of humidity. With temperature highs ranging from 5.9°C (42.6°F) in January to 27.2°C (81°F) in August and lows never dipping below freezing, ranging from 1.6°C (34.9°F) in January to 18.1°C (64.6°F) in August, Trieste enjoys relatively mild temperatures year-round.
The humid climate is complemented by considerable rainfall, with monthly averages fluctuating from 54mm (2.13") in January to 129mm (5.08") in November. The number of rainfall days varies from 10.9 days in January to 21.3 days in May, indicating rain is a common occurrence throughout the year. Snowfall is quite rare but not unheard of, mainly occurring from December to February, with January experiencing the most at 10mm (0.39").
Sunshine hours also vary, with the least in December at 5.3 hours and the most in July at 11.5 hours. This variation aligns with the change in daylight duration, from a low of 8.8 hours in December to a high of 15.6 hours in June.
The best time to visit Trieste
The optimal time to visit Trieste is typically during late spring, particularly May and June, or early autumn, specifically September. The springtime generally combines warmer weather with the holiday season, while early fall offers pleasant temperatures coupled with lower rainfalls. During these periods, the average high temperatures range between 15.8°C (60.4°F) to 21.8°C (71.2°F) and the lows are comfortably above 8.5°C (47.3°F).Daylight is more abundant as well during these months, allowing more time to explore the city. Sunshine averages from 7.4 hours to 11.1 hours per day, fueling excellent visibility conditions. The city's relative humidity is lower, ranging between 72% to 74%, making outdoor activities more enjoyable.
The worst time to visit Trieste
Winter, specifically January and February, might not be the most favorable time to visit Trieste. During these months, the city experiences its coldest temperatures, with averages from 1.6°C (34.9°F) to 2°C (35.6°F), which might detract travelers looking for milder weather. Rainfall levels between 54mm (2.13") to 82mm (3.23") and up to approximately 12 days of rainfall, add to the chills.Snowfall, although light, is most likely to occur in these months, with an average personal visibility reduced to 9km (5.6mi) due to fog and mist. Sunshine is also scarce during winter, with an average of 5 to 5.3 hours per day, while daylight averages at 9.2 to 10.4 hours.
Spring weather in Trieste
Spring in Trieste, from March to May, welcomes warmer temperatures without the scorching heat of summer. High temperatures rise incrementally from 11.1°C (52°F) in March to 19.4°C (66.9°F) in May, while low temperatures escape the chill with 4.9°C (40.8°F) in March, warming to 11.3°C (52.3°F) by May.Rainfall is frequently observed throughout spring, with a wettest month in May with an average of 100mm (3.94"), signaling the start of a period with more frequent rainy days. Days grow increasingly longer, with daylight reaching up to 14.9 hours in May, accompanied by sunshine, averaging from 7.4 hours in March to 10.1 hours in May.
Summer weather in Trieste
Summer in Trieste, spanning June through August, brings the warmest temperatures. Highs rise considerably and consistently, from 24.1°C (75.4°F) in June to a peak of 27.2°C (81°F) in August. Similarly, the low temperatures increase from 15.2°C (59.4°F) to 18.1°C (64.6°F).Despite the warmth, rain falls moderately through summer with averages between 79mm (3.11") to 99mm (3.9"), while rain days range from 13.9 to 18.3 days. Days are longer and packed with sunlight, offering 11.1 to 11.5 hours of sunshine with daylight duration from 14.1 to 15.6 hours.
Autumn weather in Trieste
Autumn, from September to November, sees a gradual decrease in temperature, with highs falling from 21.8°C (71.2°F) in September to 11.9°C (53.4°F) in November, while lows drop from 14.4°C (57.9°F) to 7.2°C (45°F). Rainfall reaches its peak in November with an average of 129mm (5.08"). The daylight hours and sunshine slowly decrease over this period, falling from 12.5 hours to 9.5 hours for daylight, and 10.1 hours to 5 hours of sunshine.Winter weather in Trieste
Winter weather from December to February brings the coldest conditions to Trieste with high temperatures ranging from 7.6°C (45.7°F) in December to 6.9°C (44.4°F) in February, and lows touching 2.9°C (37.2°F) in December and dropping to 1.6°C (34.9°F) in February. Rainfall is moderate with 81mm (3.19") in December reducing to 54mm (2.13") in February. Days are shorter and sunlight is scarce, offering only between 8.8 hours to 10.4 hours of daylight and 5 to 5.3 hours of sunshine per day.Weather in January
Trieste witnesses the extension of the chilling European winter in January, bringing cold temperature extremes and gloomy days. Temperatures dip to a low of 1.6°C (34.9°F) while the high averages only around 5.9°C (42.6°F). Weather in January »Weather in February
February sees a continuation of the wintry climate in Trieste, albeit with a noticeable warmer air compared to January. Expect a somewhat rise in temperature that sees the high reaching up to 6.9°C (44.4°F) and the low hovering around 2°C (35.6°F). Weather in February »Weather in March
By March, Trieste begins to embrace the arrival of spring with rising temperature and lengthening days. The city sees a significant jump in temperature as the high touches 11.1°C (52°F) on average with the low going up to 4.9°C (40.8°F). Weather in March »Weather in April
April in Trieste welcomes the full bloom of spring with a significant leap in temperature and longer daylight hours. The weather tends towards the warmer side as the high averages 15.8°C (60.4°F) and the low around 8.5°C (47.3°F). Weather in April »Weather in May
In May, Trieste starts to feel the warmth of the upcoming summer, bringing milder and pleasant weather conditions. Temperatures reach their year-high trend as the highest average temperature scales up to 19.4°C (66.9°F) and the lowest average is a comfy 11.3°C (52.3°F). Weather in May »Weather in June
June is the gateway to summer in Trieste with rising temperature and longer daylight hours. The city serves bright and warm days as the temperature high averages around 24.1°C (75.4°F) while the low averages 15.2°C (59.4°F). June brings the longest daylight hours to the city, and with lower humidity, it offers ideal conditions for outdoor exploration and beach activities. Weather in June »Weather in July
July is the peak of summer in Trieste, featuring hot weather and the highest sea temperature, around 24.8°C (76.6°F) on average. Land temperatures also surge to become the hottest, with the average maximum temperature soaring to a balmy 26.7°C (80.1°F). Weather in July »Weather in August
August continues the warm summer trend in Trieste with an only slight decrease in temperature from July. The high averages 27.2°C (81°F), making it, marginally, the hottest month of the year. Despite being in the midst of the holiday season, August doesn't lose its charm with long sunny days and lingering warmth. Weather in August »Weather in September
The arrival of September signifies the transition from summer to autumn in Trieste. As the month progresses, a gradual decrease in temperature, reaching an average high of 21.8°C (71.2°F), signals the end of the hot season. Weather in September »Weather in October
October's weather in Trieste follows the declining autumn trend with cooler temperatures and shorter days. Locals and visitors start to feel the chill, with temperature highs averaging around 16.7°C (62.1°F) and lows around 10.4°C (50.7°F). Weather in October »Weather in November
November sees a further drop in temperature with highs around 11.9°C (53.4°F) and lows averaging 7.2°C (45°F). The climate in Trieste takes a distinct cold turn, with shorter daylight hours and increased rainfall contributing to the wintery atmosphere. Weather in November »Weather in December
In December, Trieste finally succumbs to the throes of winter with a low around 2.9°C (37.2°F) and highs averaging 7.6°C (45.7°F). As the year wraps up, weather conditions turn harsher, showcasing winter in all its might. The days grow shorter and the nights longer, with less sunshine received throughout the day. Weather in December »Updated: Jan 30, 2024
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Trieste's January weather, with an average high temperature of 5.9°C (42.6°F) and an average low temperature of 1.6°C (34.9°F), tends to be the coldest of the year.
January is the month with the least rainfall in Trieste, Italy. Rain falls for 10.9 days and accumulates 54mm (2.13") of precipitation.
Throughout the year, in Trieste, there are 177.7 rainfall days, and 1019mm (40.12") of precipitation is accumulated.
Months with snowfall in Trieste, Italy, are January through March and December.
In Trieste, during the entire year, snow falls for 3.5 days and aggregates up to 39mm (1.54") of snow.
The months with the lowest UV index in Trieste are January, November and December, with an average maximum UV index of 2.
The month with the most snowfall in Trieste, Italy, is February, when snow falls for 1 days and typically aggregates up to 14mm (0.55") of snow.
February is the month with the coldest seawater in Trieste, Italy, with an average sea temperature of 9.3°C (48.7°F).
The months with the least sunshine in Trieste, Italy, are February and November, with an average of 5h of sunshine.
In Trieste, snow does not fall in April through November.
June has the longest days of the year, with an average of 15h and 36min of daylight.
June and July, with an average maximum UV index of 6, are months with the highest UV index in Trieste, Italy.
July and August, with an average sea temperature of 24.8°C (76.6°F), are months with the warmest seawater.
With an average of 11.5h of sunshine, July has the most sunshine of the year.
With average high and low temperatures of 27.2°C (81°F) and 18.1°C (64.6°F) respectively, August is Trieste's warmest month.
August is the least humid month in Trieste, with an average relative humidity of 68%.
On Sunday, 27. October 2024, at 03:00, Daylight Saving Time ends, and the time zone changes from CEST to CET. The next Daylight Saving Time starts on Sunday, 30. March 2025, at 02:00, and the time zone reverts from CET to CEST.
November is the most humid month, with an average relative humidity of 82%.
The month with the most rainfall is November, when the rain falls for 15.6 days and typically aggregates up to 129mm (5.08") of precipitation.
The month with the shortest days is December, with an average of 8h and 48min of daylight.
Average temperature
Trieste, Italy
The warmest month (with the highest average high temperature) is August (27.2°C).
The month with the lowest average high temperature is January (5.9°C).
The month with the highest average low temperature is August (18.1°C).
The coldest month (with the lowest average low temperature) is January (1.6°C).
Average pressure
Trieste, Italy
- Average pressure in January:
1018mbar - Average pressure in February:
1016.3mbar - Average pressure in March:
1016.1mbar - Average pressure in April:
1015.1mbar - Average pressure in May:
1014.7mbar - Average pressure in June:
1014.7mbar
- Average pressure in July:
1014.7mbar - Average pressure in August:
1015.8mbar - Average pressure in September:
1017.1mbar - Average pressure in October:
1018.2mbar - Average pressure in November:
1015.9mbar - Average pressure in December:
1019.8mbar
The month with the highest atmospheric pressure is December (1019.8mbar).
The months with the lowest atmospheric pressure are May, June and July (1014.7mbar).
Average wind speed
Trieste, Italy
- Average wind speed in January:
9.8km/h - Average wind speed in February:
11.7km/h - Average wind speed in March:
11.3km/h - Average wind speed in April:
9.6km/h - Average wind speed in May:
9km/h - Average wind speed in June:
8.6km/h
- Average wind speed in July:
8.6km/h - Average wind speed in August:
8.6km/h - Average wind speed in September:
9.9km/h - Average wind speed in October:
9.9km/h - Average wind speed in November:
10.6km/h - Average wind speed in December:
9.1km/h
The windiest month (with the highest average wind speed) is February (11.7km/h).
The calmest months (with the lowest average wind speed) are June, July and August (8.6km/h).
Average humidity
Trieste, Italy
The month with the highest relative humidity is November (82%).
The month with the lowest relative humidity is August (68%).
Average rainfall
Trieste, Italy
The wettest month (with the highest rainfall) is November (129mm).
The driest month (with the least rainfall) is January (54mm).
Average rainfall days
Trieste, Italy
- Average rainfall days in January:
10.9 days - Average rainfall days in February:
12 days - Average rainfall days in March:
13.3 days - Average rainfall days in April:
15.5 days - Average rainfall days in May:
21.3 days - Average rainfall days in June:
18.3 days
- Average rainfall days in July:
16.6 days - Average rainfall days in August:
13.9 days - Average rainfall days in September:
14.6 days - Average rainfall days in October:
13.5 days - Average rainfall days in November:
15.6 days - Average rainfall days in December:
12.2 days
The month with the highest number of rainy days is May (21.3 days).
The month with the least rainy days is January (10.9 days).
Average snowfall
Trieste, Italy
The month with the highest snowfall is February (14mm).
The months with the least snowfall are April, May, June, July, August, September, October and November (0mm).
Average snowfall days
Trieste, Italy
- Average snowfall days in January:
1.2 days - Average snowfall days in February:
1 days - Average snowfall days in March:
0.6 days - Average snowfall days in April:
0 days - Average snowfall days in May:
0 days - Average snowfall days in June:
0 days
- Average snowfall days in July:
0 days - Average snowfall days in August:
0 days - Average snowfall days in September:
0 days - Average snowfall days in October:
0 days - Average snowfall days in November:
0 days - Average snowfall days in December:
0.7 days
The month with the highest number of snowfall days is January (1.2 days).
The months with the least snowfall days are April, May, June, July, August, September, October and November (0 days).
Average sea temperature
Trieste, Italy
The best months for swimming (with the highest average sea temperature) are July and August (24.8°C).
The coldest month (with the lowest average sea temperature) is February (9.3°C).
Average daylight / Average sunshine
Trieste, Italy
- Average daylight in January:
9h and 12min - Average daylight in February:
10h and 24min - Average daylight in March:
11h and 54min - Average daylight in April:
13h and 30min - Average daylight in May:
14h and 54min - Average daylight in June:
15h and 36min
- Average daylight in July:
15h and 18min - Average daylight in August:
14h and 6min - Average daylight in September:
12h and 30min - Average daylight in October:
10h and 54min - Average daylight in November:
9h and 30min - Average daylight in December:
8h and 48min
The month with the longest days is June (Average daylight: 15h and 36min).
The month with the shortest days is December (Average daylight: 8h and 48min).
- Average sunshine in January:
5h and 18min - Average sunshine in February:
5h and 0min - Average sunshine in March:
7h and 24min - Average sunshine in April:
9h and 54min - Average sunshine in May:
10h and 6min - Average sunshine in June:
11h and 6min
- Average sunshine in July:
11h and 30min - Average sunshine in August:
11h and 24min - Average sunshine in September:
10h and 6min - Average sunshine in October:
6h and 6min - Average sunshine in November:
5h and 0min - Average sunshine in December:
5h and 18min
The month with the most sunshine is July (Average sunshine: 11h and 30min).
The months with the least sunshine are February and November (Average sunshine: 5h and 0min).
Average sunshine days
Trieste, Italy
- Average sunshine days in January:
17 days - Average sunshine days in February:
14 days - Average sunshine days in March:
15.9 days - Average sunshine days in April:
12.5 days - Average sunshine days in May:
6.6 days - Average sunshine days in June:
8.8 days
- Average sunshine days in July:
9.4 days - Average sunshine days in August:
13.8 days - Average sunshine days in September:
13.4 days - Average sunshine days in October:
15.5 days - Average sunshine days in November:
12.5 days - Average sunshine days in December:
16.4 days
The month with the most sunshine days is January (17 days).
The month with the least sunshine days is May (6.6 days).
Average UV index
Trieste, Italy
The months with the highest UV index are June and July (UV index 6).
The months with the lowest UV index are January, November and December (UV index 2).
Average cloud cover
Trieste, Italy
The month with the most cloud cover is February (Cloud cover 49).
The month with the least cloud cover is August (Cloud cover 19).
Average visibility
Trieste, Italy
The months with the highest visibility are April, May, June, July, August and September (10km).
The months with the lowest visibility are January, February, March, October, November and December (9km).
