Trieste, Italy experiences average highs of 18°C (64°F) and lows of 10°C (50°F) throughout the year. Rainfall is moderate, averaging about 11 rainy days per month. Sunshine is abundant, averaging about 9 hours per day. Average highs have warmed by 0.6°C (1.1°F) across the available records.
Trieste, Italy Weather & Climate 2026
Monthly climate averages for Trieste, Italy. Based on 10-year ERA5 reanalysis data.
Climate Overview
Drier season: Jan–Dec 
Wetter season: Apr–Nov At-a-Glance Climate Summary
Live Weather & Air Quality
Key figures
Climate Score
6.3/10
Best: June, July, August, September
UV Index
4
Low
Temperature 18°C / 10°C
Feels Like 17°C / 9°C
Rainy Days 11
Rainfall 129 mm
Sunshine 9 h
Humidity 75%
Wind Speed 16 km/h
Dew Point 10°C
Snow Days 3 days
Frost Days 5 days
Hottest Month
29°C
August
Avg Low20°C
Rain9days
Coldest Month
2°C
January
Avg High8°C
Rain10days
Driest Month
9days
February
Avg High10°C
Avg Low3°C
Windiest Month
18 km/h
November (Gusts 39)
Sea Temperature
9°C – 26°C
Warmest water: July (
26.4°C
)
Worst Time to Visit
Consider avoiding January, February, December due to less favorable weather conditions.
Sun Position
Sunrise 05:16
Daylight 15.7h
Sunset 20:57
Live conditions—
Trieste on the map · live conditions
Trieste, Italy
- Continent
- Europe
- Country
- Italy
- City
- Trieste
- Population
- 204.3K
- Elevation
- 2 m
- Coordinates
- 45.65°, 13.78°
Seasonal Breakdown
Spring
Mar–May
Avg High 17°C
Avg Low 9°C
Rain 13 days/mo
Summer
Jun–Aug
Avg High 28°C
Avg Low 19°C
Rain 10 days/mo
3/3 best months
Autumn
Sep–Nov
Avg High 18°C
Avg Low 12°C
Rain 12 days/mo
1/3 best months
Winter
Dec–Feb
Avg High 9°C
Avg Low 3°C
Rain 9 days/mo
Climate Charts
Based on historical averages (2016–2025)
Monthly Temperatures
HighLowShaded bands show the typical range across the available yearly records.
Line chart showing monthly temperatures. Jan: 8°C / 2°C . Feb: 10°C / 3°C . Mar: 13°C / 5°C . Apr: 17°C / 8°C . May: 20°C / 13°C . Jun: 26°C / 18°C . Jul: 28°C / 20°C . Aug: 29°C / 20°C . Sep: 23°C / 16°C . Oct: 19°C / 12°C . Nov: 13°C / 7°C . Dec: 9°C / 3°C .
Monthly Rainfall
Rainfall
Bar chart showing monthly rainfall. Jan: 108 mm. Feb: 110 mm. Mar: 106 mm. Apr: 106 mm. May: 156 mm. Jun: 100 mm. Jul: 93 mm. Aug: 107 mm. Sep: 198 mm. Oct: 160 mm. Nov: 186 mm. Dec: 122 mm.
Monthly Humidity
Humidity
Line chart showing monthly humidity. Jan: 79%. Feb: 77%. Mar: 71%. Apr: 70%. May: 75%. Jun: 72%. Jul: 68%. Aug: 68%. Sep: 74%. Oct: 79%. Nov: 81%. Dec: 81%.
Monthly Wind Speed
Wind SpeedGusts
Bar chart showing monthly wind speed. Jan: 15 km/h . Feb: 17 km/h . Mar: 17 km/h . Apr: 16 km/h . May: 16 km/h . Jun: 15 km/h . Jul: 14 km/h . Aug: 15 km/h . Sep: 15 km/h . Oct: 16 km/h . Nov: 18 km/h . Dec: 15 km/h .
Sunshine
Sunshine
Sunshine: Jan: 6h. Feb: 6h. Mar: 9h. Apr: 10h. May: 11h. Jun: 13h. Jul: 13h. Aug: 12h. Sep: 10h. Oct: 8h. Nov: 6h. Dec: 5h.
Sea Temperature
Sea Temperatureswim
Line chart showing monthly sea temperature. Jan: 9°C . Feb: 9°C . Mar: 11°C . Apr: 14°C . May: 18°C . Jun: 23°C . Jul: 26°C . Aug: 26°C . Sep: 24°C . Oct: 19°C . Nov: 15°C . Dec: 11°C .
UV Index
UV Index
Bar chart showing monthly UV index. Jan: UV 2. Feb: UV 2. Mar: UV 4. Apr: UV 5. May: UV 6. Jun: UV 7. Jul: UV 7. Aug: UV 6. Sep: UV 5. Oct: UV 3. Nov: UV 2. Dec: UV 1.
Monthly Daylight Hours
Daylight12h reference
Monthly Dew Point & Comfort
Dew Point Dry Comfortable Humid Muggy Oppressive
Snow Days
Snow DaysSnowfall
Snow Days: Jan: 5 days. Feb: 3 days. Mar: 2 days. Apr: 1 days. May: 0 days. Jun: 0 days. Jul: 0 days. Aug: 0 days. Sep: 0 days. Oct: 0 days. Nov: 1 days. Dec: 3 days.
Climate Trends
Average highs have warmed by 0.6°C (1.1°F) across the available records. Average rainfall has remained broadly steady.
2016 to 2025
Avg high Avg rainfall
Climate summary
| Last 12 months | All years | |
|---|---|---|
| Hottest month | Jun 2025 · 29°C | Aug · 29°C |
| Coldest month | Feb 2025 · 3°C | Jan · 2°C |
| Wettest month | Mar 2025 · 226 mm | Sep · 198 mm |
| Windiest month | Nov 2025 · 18 km/h | Nov · 18 km/h |
Month-by-Month Weather Table
January
Poor 
February
Poor March
Fair April
Good May
Good June best
Excellent July best
Excellent August best
Excellent September best
Excellent October
Good November
Wet December
Poor | Month | Temp | Feels Like | Rain | Sun | Humidity | UV | Status | Details |
|---|---|---|---|---|---|---|---|---|
| January | 8°C / 2°C | 5°C / -2°C | 10days (108 mm) Wet | 5.5h Fair | 79% Humid | 1.5 Low | Poor | View Details |
| February | 10°C / 3°C | 7°C / -1°C | 9days (110 mm) Wet | 6.4h Fair | 77% Humid | 2.3 Moderate | Poor | View Details |
| March | 13°C / 5°C | 11°C / 2°C | 10days (106 mm) Wet | 8.7h Good | 71% Muggy | 3.6 Moderate | Fair | View Details |
| April | 17°C / 8°C | 15°C / 6°C | 11days (106 mm) Wet | 10.3h Excellent | 70% Muggy | 5.1 High | Good | View Details |
| May | 20°C / 13°C | 21°C / 11°C | 17days (156 mm) Wet | 11.2h Excellent | 75% Muggy | 6 High | Good | View Details |
| June best | 26°C / 18°C | 28°C / 19°C | 10days (100 mm) Wet | 12.9h Excellent | 72% Muggy | 7 High | Excellent | View Details |
| July best | 28°C / 20°C | 31°C / 21°C | 11days (93 mm) Wet | 13h Excellent | 68% Muggy | 6.9 High | Excellent | View Details |
| August best | 29°C / 20°C | 31°C / 21°C | 9days (107 mm) Wet | 11.8h Excellent | 68% Muggy | 6.1 High | Excellent | View Details |
| September best | 23°C / 16°C | 24°C / 15°C | 12days (198 mm) Wet | 9.6h Good | 74% Muggy | 4.7 Moderate | Excellent | View Details |
| October | 19°C / 12°C | 18°C / 10°C | 12days (160 mm) Wet | 7.7h Good | 79% Humid | 3 Moderate | Good | View Details |
| November | 13°C / 7°C | 11°C / 4°C | 13days (186 mm) Wet | 5.8h Fair | 81% Humid | 1.9 Low | Wet | View Details |
| December | 9°C / 3°C | 7°C / 0°C | 9days (122 mm) Wet | 5.1h Fair | 81% Humid | 1.4 Low | Poor | View Details |
Compare Nearby City Climates
Frequently Asked Questions
The best months to visit Trieste are June, July, August, September, when temperatures are comfortable and rainfall is at its lowest. This is based on 10-year climate averages for Trieste, scoring temperature, rainfall, humidity, and sunshine hours.
The hottest month in Trieste is August, with average daytime highs of 29°C (84°F). Plan outdoor activities for early morning or late afternoon if visiting during this period.
The coldest month in Trieste is January, with average overnight lows of 2°C (35°F). Pack warm layers and expect shorter daylight hours during this period.
The wettest month in Trieste is September, averaging 198mm of precipitation across 12 rainy days. An umbrella or waterproof jacket is essential.
The rainy season in Trieste runs through May, November, September, October, with the heaviest rainfall in May. Based on 10-year averages for Trieste.
Trieste receives approximately 108 sunshine hours per year. The sunniest month is July with around 13 hours. Based on climate data for Trieste.
The least favorable months to visit Trieste are January, February, December, primarily due to less favorable weather conditions. For the best conditions, consider June, July, August, September instead.
The annual average UV index in Trieste is 4, classified as moderate. Standard sun protection (sunscreen, hat) is recommended during prolonged outdoor exposure.
Average humidity in Trieste is 75%, classified as moderate. Humidity levels are generally comfortable and should not affect outdoor activities for most people.
Yes — sea temperatures in June, July, August, September average 25°C (77°F), which is warm and comfortable for swimming and water activities.
Yes, Trieste receives snow. Months with snowfall average 3 snow days and 3 cm (1 in) of accumulation, with about 5 frost days during winter.
Average wind speeds in Trieste are 16 km/h (10 mph). The windiest month is November with peak winds reaching 18 km/h (11 mph) (gusts up to 39 km/h / 24 mph).
Trieste averages 5 clear-sky days per month with overall cloud cover around 56%. The clearest skies occur in March.
The annual average dew point in Trieste is 10°C (50°F), which feels pleasant with low humidity. Outdoor activities are comfortable year-round from a humidity standpoint.
Trieste has a Humid Subtropical climate, classified as Cfa under the Köppen system. Temperate climates have mild winters and warm summers, with rainfall spread across the year and four distinct seasons.
The 'feels like' temperature in Trieste ranges from 9°C (48°F) to 17°C (63°F) on average. The 'feels like' temperature closely matches the actual temperature throughout most of the year.
Yes, June is a great time to visit Trieste. It earns a climate score of 9/10 with Excellent.
For June in Trieste, pack Umbrella, Waterproof jacket, Breathable clothing, Sunscreen (SPF 30+), Sun hat. With average highs of 26°C (79°F) and 10 rainy days, these essentials will keep you comfortable.
Data Source
Climate data derived from ERA5 reanalysis (ECMWF), averaged over 2016–2025. Sea surface temperature from marine reanalysis data. Climate scores and seasonal estimates are computed by WorldStats.
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