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 » [Resources]