May Weather in Trieste, Italy

Last updated: March 24, 2025

May in Trieste, Italy offers a delightful blend of warm temperatures and refreshing spring showers. With maximum temperatures reaching up to 26°C (79°F) and an average of 16°C (61°F), the month invites both locals and tourists to explore its vibrant streets. Visitors should prepare for the occasional rain, as 19 days may bring a total precipitation of 175 mm (6.9 in), creating a lush backdrop for outdoor adventures. The average humidity of 70% adds a touch of softness to the air, making May an ideal time to experience the beauty and culture of this scenic coastal city.

May Temperature in Trieste

In May, Trieste, Italy, begins to fully embrace the warmth of spring, showcasing a delightful transition in temperatures. With minimums around 6°C (44°F) and maximums soaring to 26°C (79°F), the city enjoys an average of 16°C (61°F), making it a fantastic time for outdoor exploration. Compared to the cooler preceding months, May offers a significant uplift, paving the way for the summer warmth that follows in June. This month serves as a perfect balance between lingering spring freshness and the anticipation of summer’s heat, with longer daylight hours inviting residents and visitors alike to bask in the beauty of Trieste’s coastal charm.

May Weather in Trieste: Daily Temperature Highs, Lows, and Averages

The chart illustrates May temperature patterns in Trieste, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends.
JanFebMarAprMayJunJulAugSepOctNovDec394246536170737466574942
Data source: Temperature data for Trieste generated using information from the Copernicus Climate Change Service.
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The average of daily temperatures (24 hours) calculated across all days in the month.

May Precipitation in Trieste

In May, Trieste experiences a notable increase in precipitation, with 175 mm (6.9 in) of rainfall over the month, making it the wettest period so far this year. This significant accumulation is spread across 19 days, highlighting that May is characterized by frequent rain showers that contribute to the lush scenery of the region. The uptick in rainfall follows a relatively steady pattern from April's 117 mm, suggesting a shift towards the peak of the rainy season as spring transitions into summer. This trend not only enhances the vibrant landscapes but also lays the groundwork for the drier months ahead, particularly as June follows with a considerable reduction to 105 mm (4.1 in), emphasizing the cyclical nature of Trieste's climate.

May Precipitation Trends in Trieste

The chart displays monthly precipitation patterns in Trieste, with values for each month alongside May's data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how May's conditions compare to those of other months.
JanFebMarAprMayJunJulAugSepOctNovDec66128871171751059389183126199166
Data source: Precipitation data for May generated using information from the Copernicus Climate Change Service.
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May Humidity in Trieste

In May, Trieste, Italy experiences a gradual decline in humidity, reaching around 70%—a slight decrease from the consistent 73% seen in both March and April. This shift marks the beginning of a trend towards drier conditions as summer approaches, with June further reducing humidity to 69%. Compared to the colder months, where humidity hovers near 88%, May's milder, more breathable atmosphere invites outdoor activities and exploration. As the season transitions, the city's climate becomes increasingly pleasant, allowing both locals and visitors to enjoy the vibrant beauty of Trieste.

May Average Humidity in Trieste

This chart illustrates the average monthly humidity levels in Trieste, with May's data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, allowing you to see how May's humidity levels compare to other months.
JanFebMarAprMayJunJulAugSepOctNovDec88%82%73%73%70%69%63%51%64%83%89%88%
Data source: Humidity data for May generated using information from the Copernicus Climate Change Service.

May UV Index in Trieste

As May rolls into Trieste, Italy, the sun begins to assert its presence, bringing a notable increase in the UV Index to a striking 8, which falls within the very high exposure category. This marks a significant jump from the previous month's UV Index of 6, emphasizing the importance of taking precautions to protect your skin, as the estimated burn time reduces to just 15 minutes. With summer approaching, the trend indicates that the UV levels will continue to escalate, peaking in June and July. As you enjoy the longer, sunnier days, be sure to stay informed about the local UV conditions by checking the detailed insights on the Trieste UV Index.

Maximum UV Index Levels in Trieste for May

The chart shows the monthly maximum UV Index (UVI) for Trieste in May, representing the highest UV radiation level. The UVI measures the intensity of ultraviolet radiation from the sun, indicating the potential risk of sunburn and UV-related health issues.
JanFebMarAprMayJunJulAugSepOctNovDec235689987532
Data source: Trieste May UVI data generated using information from the Copernicus Climate Change Service.

UV Risk Categories

  •  Extreme (11+): Avoid the sun, stay in shade.
  •  Very High (8-10): Limit sun exposure.
  •  High (6-7): Use SPF 30+ and protective clothing.
  •  Moderate (3-5): Midday shade recommended.
  •  Low (0-2): No protection needed.

May Sunshine in Trieste

In May, Trieste basks in a delightful average of 372 sunshine hours, marking a peak for the spring season. This month continues the upward trend in daylight that starts with January's modest 182 hours and blossoms through the following months. As winter fades, the sun gradually shines brighter—February sees an increase to 223 hours, followed by a significant jump to 315 hours in March and 344 hours in April. By June, the sunshine escalates even further, reaching 417 hours, suggesting that May serves as a beautiful bridge between the vibrant spring and the sun-drenched summer. The gradual rise highlights Trieste's transition into warmer months, offering a splendid backdrop for exploration and relaxation.

Monthly Sunshine Duration in Trieste: May Highlighted

The May sunshine duration represents the total number of hours Trieste experiences direct sunlight during the month of May, excluding cloudy or obstructed periods. This chart compares the sunshine duration of May with the other months of the year.
JanFebMarAprMayJunJulAugSepOctNovDec182h223h315h344h372h417h430h397h326h293h229h207h
Data source: Trieste May Sunshine duration data generated using information from the Copernicus Climate Change Service.

Chance of Sun in Trieste During May

In Trieste, Italy, May brings a 37% likelihood of sunny weather, a slight decline compared to the preceding months. This dip follows the upward trend seen in March, where sunny days reach a notable 61%, but disappointment lingers in April with only 41%. The sunshine begins to rebound in June, climbing to 52%, suggesting that while May may not deliver an abundance of sun, it serves as a transition between the cooler spring and the sunnier summer months ahead. As spring gives way to summer, residents and visitors alike can look forward to increased chances of enjoying Italy's picturesque landscapes bathed in sunlight.

Percentage of Sunny Days in May in Trieste

The chart illustrates the percentage of sunny days in Trieste throughout the year, with May highlighted. It highlights the variation in sunshine across each month and provides an overview of the typical frequency of sunny days, offering insights into how often Trieste experiences clear skies throughout the year.
JanFebMarAprMayJunJulAugSepOctNovDec29%40%61%41%37%53%49%55%56%47%36%37%
Data source: Trieste May chance of sun data, generated using information from the Copernicus Climate Change Service.

Daylight Hours in Trieste in May

As spring blossoms into summer, Trieste, Italy, experiences a remarkable increase in daylight duration. Starting with 9 hours in January, the days gradually lengthen, reaching 14 hours by May. This upward trend reflects nature's vibrant awakening as the sun lingers longer in the sky, inviting locals and visitors alike to indulge in outdoor activities. The daylight continues to climb, peaking at 15 hours in June and July, before gently tapering off through the fall. By October, daylight dwindles back to 10 hours, suggesting a rhythmic dance of light and dark that defines the seasons in this picturesque Mediterranean city. May stands out as a perfect moment to embrace the warmth and brightness, making it an ideal time for exploration and enjoyment in Trieste.

Average Daylight Hours in Trieste for May

The chart illustrates the variation in daylight duration in Trieste throughout the year, with May highlighted. It shows the monthly changes in daylight hours, calculated by summing the hours between sunrise and sunset.
JanFebMarAprMayJunJulAugSepOctNovDec9h 7m10h 22m11h 56m13h 33m14h 55m15h 38m15h 15m14h 2m12h 29m10h 53m9h 28m8h 43m
Data source: Trieste daylight hours, calculated by summing the hours between sunrise and sunset for each day.

May Winds in Trieste

In May, Trieste, Italy, experiences a gentle resurgence in wind, with average speeds reaching 3.0 m/s (7 mph), mirroring the conditions of January. This month marks a pivotal transition, as the winds begin to shift towards warmer days, creating a vibrant atmosphere. Following a slight dip in early spring, where March and April recorded lower speeds, May’s consistent breezes breathe life into the city's coastal charm. As summer approaches, the winds will gradually decrease in intensity, dropping to around 2.2 m/s (5 mph) by June, but May stands out as a favorite for those seeking a balance of mild weather and refreshing gusts. The patterns of wind speed in Trieste highlight the city's dynamic climate, where each month offers its unique touch.

Average May Wind Speed in Trieste

The chart displays monthly wind speed patterns in Trieste, with values for each month shown alongside May's data, which is highlighted for easy comparison. It illustrates the average wind speed, offering insights into how May's wind conditions compare to the rest of the year.
JanFebMarAprMayJunJulAugSepOctNovDec3.02.82.62.93.0 m/s2.22.42.82.53.73.92.4
Data source: Trieste May wind data, generated using information from the Copernicus Climate Change Service.

How May Weather in Trieste Compares to Other Months

The weather in Trieste changes throughout the year, offering a unique experience in each season. Below is a month-by-month comparison of May's weather with other months, highlighting differences in temperature, precipitation, and other key factors. Click on each section to discover seasonal trends in Trieste and find detailed weather information for every month.

When comparing the weather in May and January, notable differences emerge. May boasts milder temperatures, with averages ranging from a minimum of 6°C (44°F) to a maximum of 26°C (79°F), while January is considerably colder, featuring temperatures from -8°C (17°F) to a maximum of 12°C (54°F). Precipitation also varies greatly; May experiences about 175 mm (6.9 in) over 19 days, leading to a reasonably humid atmosphere at 70%. In contrast, January sees only 66 mm (2.6 in) of rainfall over just 7 days, but with higher humidity at 88%. For more detailed information, you can check Trieste weather in January.

May generally offers a much warmer climate compared to February, with average temperatures rising from a chilly 6°C (43°F) in February to a pleasant 16°C (61°F) in May. February can see minimum temperatures dropping as low as -7°C (20°F), while May's temperatures rarely dip below 6°C (44°F) and can reach highs of 26°C (79°F). Additionally, May experiences more precipitation, totaling 175 mm (6.9 in) over 19 days, compared to February's 128 mm (5.0 in) over just 10 days. While February has a slightly higher humidity level at 82%, May's average humidity rests at 70%. For a more detailed look at the weather during February, you can visit Trieste weather in February.

When comparing the weather in May and March, a notable contrast emerges in both temperature and precipitation. May enjoys a much milder climate with average temperatures ranging from 6°C (44°F) to a pleasant high of 26°C (79°F), while March experiences cooler conditions, with temperatures dipping as low as -10°C (14°F) and peaking at only 20°C (69°F). Additionally, May sees higher precipitation levels totaling 175 mm (6.9 in) over 19 days, compared to March, which has 87 mm (3.4 in) over just 10 days. The humidity in March is slightly higher at 73%, while May's humidity sits at 70%. For more details on March weather specifically, you can visit Trieste weather in March.

In comparing the weather between April and May, it's clear that May generally offers warmer temperatures, with a minimum of 6°C (44°F) and an average of 16°C (61°F), compared to April's colder minimum of -1°C (30°F) and average of 12°C (54°F). The maximum temperatures are similar, with May reaching up to 26°C (79°F) while April peaks at 24°C (75°F). However, May is wetter, experiencing 175 mm (6.9 in) of precipitation over 19 days, in contrast to April's 117 mm (4.6 in) over just 10 days. Humidity remains relatively high, slightly lower in May at 70% compared to April's 73%. For a more detailed look at April weather, you can check Trieste weather in April.

May and June show a noticeable shift in weather patterns. In May, temperatures range from a minimum of 6°C (44°F) to a maximum of 26°C (79°F), with an average of 16°C (61°F). The month also sees significant rainfall, totaling 175 mm (6.9 in) over 19 days, contributing to a relatively high humidity level of 70%. By June, the average temperature increases to 21°C (71°F), with a minimum of 11°C (52°F) and a maximum of 33°C (91°F). Precipitation decreases significantly to 105 mm (4.1 in) over just 9 days, while humidity slightly drops to 69%. This transition marks June as a warmer and drier month compared to May. For more detailed weather information, you can check Trieste weather in June.

May and July present distinct weather profiles. In May, temperatures range from a minimum of 6°C (44°F) to a maximum of 26°C (79°F), with an average of 16°C (61°F). The month is characterized by higher precipitation, accumulating 175 mm (6.9 in) over 19 days, along with a humidity level of 70%. In contrast, July boasts milder mornings and warmer days, with temperatures ranging from 15°C (59°F) to 32°C (91°F) and an average of 23°C (73°F). Precipitation decreases significantly to 93 mm (3.6 in) over just 13 days, and humidity drops to 63%. For a detailed look at the weather in July, you can check Trieste weather in July.

May and August exhibit contrasting weather patterns. In May, temperatures range from a cool minimum of 6°C (44°F) to a comfortable maximum of 26°C (79°F), with an average of 16°C (61°F). The month is characterized by significant precipitation, totaling 175 mm (6.9 in) over approximately 19 days and a higher humidity level of 70%. In contrast, August brings warmer temperatures, with a minimum of 13°C (56°F) and a maximum reaching 34°C (93°F), averaging 23°C (74°F). Rainfall is considerably lighter at 89 mm (3.5 in) spread across just 10 days, and humidity drops to a more comfortable 51%. For more detailed insights, you can explore Trieste weather in August.

May and September each showcase distinct weather patterns. In May, temperatures range from a cool 6°C (44°F) at night to a comfortable 26°C (79°F) during the day, with an average of 16°C (61°F). The month is marked by frequent rainfall, with precipitation occurring on 19 days and totaling 175 mm (6.9 in), alongside relatively high humidity at 70%. In contrast, September offers milder nights with a minimum of 8°C (46°F) and warmer days reaching up to 30°C (87°F), averaging 19°C (66°F). With slightly more rain at 183 mm (7.2 in) over just 12 days, September boasts lower humidity at 64%, creating a more pleasant atmosphere overall. For more detailed insights, visit Trieste weather in September.

May and October exhibit notable differences in weather patterns. In May, temperatures range from a minimum of 6°C (44°F) to a pleasant maximum of 26°C (79°F), with an average of 16°C (61°F). The month experiences significant precipitation, totaling 175 mm (6.9 in) over approximately 19 days, coupled with a relative humidity of 70%. In contrast, October sees slightly cooler temperatures with a range from 6°C (43°F) to a maximum of 22°C (72°F) and an average of 14°C (58°F). Precipitation decreases to 126 mm (5.0 in) over just 10 days, while humidity rises to 83%, making October feel somewhat more damp. For more detailed information, check Trieste weather in October.

May and November present contrasting weather patterns, reflecting the transition from spring to autumn. In May, temperatures range from a minimum of 6°C (44°F) to a maximum of 26°C (79°F), with an average of 16°C (61°F). This month receives around 175 mm (6.9 in) of precipitation over approximately 19 days, coupled with a humidity level of 70%. In contrast, November experiences cooler temperatures, with a minimum of 0°C (33°F) and a maximum of 18°C (65°F), averaging at 10°C (50°F). Rainfall increases slightly to 199 mm (7.8 in), distributed over just 13 days, and humidity rises significantly to 89%. For more detailed information about November weather, you can check Trieste weather in November.

In May, the weather is considerably milder, with average temperatures ranging from a minimum of 6°C (44°F) to a maximum of 26°C (79°F), offering a pleasant spring climate for outdoor activities. However, May also sees a fair amount of rainfall, totaling 175 mm (6.9 in) over about 19 days, accompanied by a humidity level of 70%. In contrast, December brings much cooler temperatures, with an average ranging from -2°C (29°F) to 14°C (58°F). Although precipitation is slightly lower at 166 mm (6.5 in), it occurs over fewer days (12), and the humidity peaks at 88%, contributing to a chilly and damp atmosphere. For more details on the December climate, visit Trieste weather in December.

Compare Trieste's Climate with Cities Worldwide

Conclusion: What to Expect From May Weather in Trieste

May in Trieste marks a delightful transition into spring, showcasing warmer temperatures that invite outdoor adventures. With a pleasant average of 16°C, this month stands out from the cooler months of early spring, providing a refreshing escape from the chill. However, it is also characterized by its notable rainfall, with nearly 20 days experiencing some level of precipitation, making it wetter compared to the summer ahead. Humidity levels hover around 70%, adding a mildness to the air that can feel both comfortable and refreshing. To fully appreciate the unique charm of Trieste’s May weather, explore more about its climate in this detailed guide: Trieste Climate.