Trieste in Spring
In spring (March, April and May), Trieste sees average daytime highs around 15°C and overnight lows near 9°C, with 333 mm of precipitation over about 35 wet days across the season. It is the 3rd-warmest season and the 2nd-wettest season.
Over the season highs climb from about 9°C in early March to 21°C by late May. The sky is clear or mostly clear about 35% of the time across spring, and the air most often feels dry.
Spring is Trieste's 3rd-best season to visit on our travel score. For the whole year in context, see Trieste's year-round climate.
- Avg daytime high
- 15°C
- 3rd-warmest season
- Avg overnight low
- 9°C
- Precipitation
- 333 mm
- 35 wet days
- Avg wind
- 9 km/h
- Travel score
- 4.2
- 3rd-best season
- Months
- Mar · Apr · May
Temperature in Trieste in Spring
Over the season highs climb from about 9°C in early March to 21°C by late May.
A typical spring day in Trieste reaches about 15°C and drops to 9°C overnight. The warmest of the three months is May, the coolest March.
How spring really feels in Trieste
Once humidity and wind are folded in, spring brings about 0 days that feel above 32°C and 0 that feel at or below 0°C.
spring sits comfortably in between — no days that feel dangerously hot or drop to a hard freeze once humidity and wind are folded in.
Trieste weather by month
How the three spring months (March, April and May) compare with the rest of the year — the season's months are highlighted.
| Month | High / Low (°C) | Rainfall (mm) | Wet days | Snow days | Daylight (hours) | Travel score |
|---|---|---|---|---|---|---|
| Jan | 6° / 2° | 90 | 9.5 | 2.7 | 8.9 | 0.5 |
| Feb | 7° / 2° | 97 | 8.6 | 2.9 | 10.1 | 1.1 |
| Mar | 11° / 5° | 101 | 9.7 | 1.6 | 11.6 | 2.7 |
| Apr | 15° / 8° | 110 | 12.1 | 0.5 | 13.3 | 4.2 |
| May | 19° / 13° | 122 | 13 | 0 | 14.7 | 5.8 |
| Jun | 23° / 17° | 111 | 12.2 | 0 | 15.4 | 6.7 |
| Jul | 26° / 19° | 87 | 10.7 | 0 | 15.1 | 7.0 |
| Aug | 26° / 19° | 111 | 10.3 | 0 | 13.9 | 7.0 |
| Sep | 21° / 15° | 170 | 11.4 | 0 | 12.3 | 6.4 |
| Oct | 16° / 11° | 184 | 13 | 0.1 | 10.7 | 4.8 |
| Nov | 11° / 7° | 195 | 13.2 | 1.1 | 9.3 | 2.5 |
| Dec | 7° / 3° | 129 | 10.1 | 2.1 | 8.6 | 0.9 |
Cloud cover in Spring
The sky is clear or mostly clear about 35% of the time across spring.
Chance of precipitation in Spring
Trieste gets around 333 mm of rain and snow over 35 wet days across spring. The line is the day-by-day chance of measurable precipitation.
Humidity in Spring
Most of spring feels dry — the stacked bands show each day's mix of comfort levels, read off the dew point.
Wind in Spring
Winds average 9 km/h across spring.
Sunrise & sunset in Spring
Daylight runs from about 10 h 48 min in early March to 15 h 12 min by late May. The lit band spans sunrise to sunset each day.
Solar energy in Spring
Average shortwave solar energy reaching the ground each day across spring, about 4.7 kWh/m².
Is spring a good time to visit Trieste?
Our two travel scores rate spring for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal), averaged across the three months.
spring is a reasonable time to visit Trieste for sightseeing.
What to pack for Trieste in Spring
From spring's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In spring, Trieste sees daytime highs around 15°C and nights near 9°C. Pack a warm layer. Worth having: rain gear and sun protection. About 35 days see rain.
Sea temperature near Trieste in Spring
The nearest coast averages about 14°C across spring — the other half of the beach question. The full-year curve and swim-comfort zones are below.
The sea offshore is warmest in August at about 25°C and coldest in February near 10°C.
It's comfortable for a long swim from May 31 to Oct 9 — about 4.3 months when the water holds above 20°C.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Sea temperature (°C) | 11 | 10 | 10 | 13 | 18 | 23 | 25 | 25 | 23 | 19 | 16 | 13 |
| Comfort | Bracing | Bracing | Bracing | Bracing | Cool | Refreshing | Warm | Warm | Refreshing | Cool | Cool | Bracing |
| Sea temperature (°C) | Comfort | |
|---|---|---|
| Jan | 11 | Bracing |
| Feb | 10 | Bracing |
| Mar | 10 | Bracing |
| Apr | 13 | Bracing |
| May | 18 | Cool |
| Jun | 23 | Refreshing |
| Jul | 25 | Warm |
| Aug | 25 | Warm |
| Sep | 23 | Refreshing |
| Oct | 19 | Cool |
| Nov | 16 | Cool |
| Dec | 13 | Bracing |
UV index in Trieste in Spring
Clear-sky midday UV across spring averages around 6 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.
Under clear skies, the midday UV index in Trieste peaks around July 15 at about 8 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near January 1 at about 1 (low).
The index reaches 3 or more — the level where the WHO recommends sun protection — in 7 months of the year.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| UV index (midday) | 1 | 2 | 4 | 7 | 7 | 8 | 8 | 7 | 5 | 3 | 2 | 1 |
| Level | Low | Moderate | Moderate | High | High | Very high | Very high | Very high | Moderate | Moderate | Low | Low |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 1 | Low |
| Feb | 2 | Moderate |
| Mar | 4 | Moderate |
| Apr | 7 | High |
| May | 7 | High |
| Jun | 8 | Very high |
| Jul | 8 | Very high |
| Aug | 7 | Very high |
| Sep | 5 | Moderate |
| Oct | 3 | Moderate |
| Nov | 2 | Low |
| Dec | 1 | Low |
Air quality in Trieste in Spring
Average fine-particle pollution (PM2.5) through the year — so you can see where spring falls, not just the annual average.
Air quality in Trieste is worst in January — around 16 µg/m³ PM2.5 (moderate), about 1.8× the cleanest month (September, 9 µg/m³).
Seasonal pattern from CAMS reanalysis, scaled to Trieste's WHO annual average of 12 µg/m³.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| PM2.5 (µg/m³) | 16 | 14 | 14 | 13 | 11 | 12 | 12 | 10 | 9 | 10 | 10 | 13 |
| Level | Moderate | Moderate | Moderate | Moderate | Good | Good | Good | Good | Good | Good | Good | Moderate |
| PM2.5 (µg/m³) | Level | |
|---|---|---|
| Jan | 16 | Moderate |
| Feb | 14 | Moderate |
| Mar | 14 | Moderate |
| Apr | 13 | Moderate |
| May | 11 | Good |
| Jun | 12 | Good |
| Jul | 12 | Good |
| Aug | 10 | Good |
| Sep | 9 | Good |
| Oct | 10 | Good |
| Nov | 10 | Good |
| Dec | 13 | Moderate |
Where is Trieste?
Trieste sits at 45.6°N, 13.8°E, 2 m above sea level, in Italy. The nearest listed city is Koper, 12 km away.
Topography around Trieste
How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Trieste.
Within 3 km, the terrain around Trieste has significant variations in elevation — a maximum elevation change of 451 m around an average of 72 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 779 m; within 80 km, extreme variations in elevation — a maximum elevation change of 2,524 m.
The land around Trieste is covered by artificial surfaces (41%), trees (31%) and water (27%) within 3 km, trees (50%) and water (32%) within 16 km, and trees (52%) and water (23%) within 80 km.
Italy travel facts
- Travel advisory
- Level 2
- Exercise Increased Caution
- Power plugs
- Type C / F / L
- 230 V · 50 Hz
- Prices
- ≈ 69% of US
- price level, 2025
- GDP per capita
- $43,309
- 2025
- Happiness
- 6.6 / 10
- World Happiness, 2025
- Safe drinking water
- 97%
- of population, 2024
- Homicide rate
- 0.6
- per 100k, 2023
- Road deaths
- 5.3
- per 100k/yr, 2019
- Income group
- High
- World Bank
- English
- Moderate
- EF EPI 513
- Religion
Sources: World Bank, US State Department, World Happiness Report, WHO/UNICEF, EF EPI, CIA World Factbook.
Data sources
Temperature, precipitation, cloud, humidity, wind and solar figures are a 1991–2020 climatology for Trieste (45.6495°, 13.7768°, elevation 2 m), computed from hourly ERA5 reanalysis — contains modified Copernicus Climate Change Service information. Sun figures are astronomical calculations, not observations. City data © GeoNames, CC BY 4.0. Map outlines from Natural Earth (public domain); interactive map © Google.