Best time to visit Trieste
Month-by-month weather averages for Trieste.
Trieste, Friuli Venezia Giulia, Italy
°C
mm
- Average daily high and low
- Precipitation
- Good month
- Best month
- Made good or best by an event
| Month | Average daily high | Average daily low | Precipitation | Verdict |
|---|---|---|---|---|
| January | 6.6 °C / 44 °F | 2.4 °C / 36 °F | 109 mm / 4.3 in | neither best nor good |
| February | 8 °C / 46 °F | 2.9 °C / 37 °F | 115 mm / 4.5 in | neither best nor good |
| March | 11.3 °C / 52 °F | 5.2 °C / 41 °F | 117 mm / 4.6 in | neither best nor good |
| April | 15.6 °C / 60 °F | 8.9 °C / 48 °F | 100 mm / 3.9 in | good month |
| May | 19.4 °C / 67 °F | 13.1 °C / 56 °F | 143 mm / 5.6 in | good month |
| June | 24.3 °C / 76 °F | 17.6 °C / 64 °F | 105 mm / 4.1 in | good month |
| July | 26.7 °C / 80 °F | 19.6 °C / 67 °F | 99 mm / 3.9 in | good month |
| August | 26.4 °C / 80 °F | 19.3 °C / 67 °F | 116 mm / 4.5 in | good month |
| September | 21.9 °C / 71 °F | 15.6 °C / 60 °F | 180 mm / 7.1 in | good month |
| October | 17 °C / 63 °F | 11.5 °C / 53 °F | 159 mm / 6.2 in | good month |
| November | 11.8 °C / 53 °F | 7.5 °C / 46 °F | 183 mm / 7.2 in | neither best nor good |
| December | 7.8 °C / 46 °F | 3.7 °C / 39 °F | 124 mm / 4.9 in | neither best nor good |
Good and best months depend on more than temperature, rain and events. How they are chosen
Each activity on this page has its own good and best months, rated on twenty years of daily weather records. Which measures count, and how much, depends on the activity: humidity for exploring outdoors, wind for the beach, hiking and skiing, snow for skiing alone. Between them, the activities are rated on:
- Daytime highs
- Night-time lows
- How warm it feels
- Humidity
- How much of the day is sunny
- Hours of daylight
- Monthly rainfall
- How many days it rains
- Days of heavy rain
- Wind
- Snowfall and days with snow
- Major events, such as festivals
The chart shows the good and best months for exploring outdoors.
The event icon marks a month that an event lifts to good or best, such as a festival or a natural spectacle. Choose “Weather only” in the toolbar to rate the months on weather alone.
Best months by activity
Exploring outdoors
Mild days and nights, mostly dry and bright. The default for 'when should I go'.
- JJanuary: neither
- FFebruary: neither
- MMarch: neither
- AApril: good
- MMay: good
- JJune: good
- JJuly: good
- AAugust: good
- SSeptember: good
- OOctober: good
- NNovember: neither
- DDecember: neither
- Good
- April–October
Why these months
April · good
In its favour: share of daylight that is sunny 79%, feels like (high) 14.1 °C / 57 °F, average daily high 15.6 °C / 60 °F, precipitation 100 mm / 3.9 in, average daily low 8.9 °C / 48 °F, days with heavy rain 3.8 days, wet days 11.1 days, relative humidity 71%.
May · good
In its favour: feels like (high) 19.4 °C / 67 °F, average daily high 19.4 °C / 67 °F, share of daylight that is sunny 78%, average daily low 13.1 °C / 56 °F, relative humidity 74%.
Against: precipitation 143 mm / 5.6 in, wet days 15 days, days with heavy rain 5.2 days.
June · good
In its favour: feels like (high) 26 °C / 79 °F, average daily high 24.3 °C / 76 °F, share of daylight that is sunny 83%, precipitation 105 mm / 4.1 in, average daily low 17.6 °C / 64 °F, days with heavy rain 3.5 days, wet days 11.7 days, relative humidity 73%.
July · good
In its favour: feels like (high) 29 °C / 84 °F, share of daylight that is sunny 87%, average daily high 26.7 °C / 80 °F, precipitation 99 mm / 3.9 in, days with heavy rain 3.3 days, average daily low 19.6 °C / 67 °F, wet days 11.1 days, relative humidity 71%.
August · good
In its favour: feels like (high) 28.5 °C / 83 °F, share of daylight that is sunny 87%, average daily high 26.4 °C / 80 °F, precipitation 116 mm / 4.5 in, wet days 10 days, average daily low 19.3 °C / 67 °F, days with heavy rain 4 days, relative humidity 72%.
September · good
In its favour: feels like (high) 22.1 °C / 72 °F, average daily high 21.9 °C / 71 °F, share of daylight that is sunny 80%, average daily low 15.6 °C / 60 °F, wet days 11.3 days, relative humidity 75%.
Against: precipitation 180 mm / 7.1 in, days with heavy rain 5.4 days.
October · good
In its favour: feels like (high) 15.8 °C / 60 °F, share of daylight that is sunny 73%, average daily high 17 °C / 63 °F, average daily low 11.5 °C / 53 °F, wet days 11.8 days.
Against: precipitation 159 mm / 6.2 in, days with heavy rain 5.2 days, relative humidity 78%.
An activity is listed only where it applies: skiing at ski destinations, beach and swimming at beach destinations. The nearest ski area is Cerkno, 61 km away.
Weather averages
Monthly averages over twenty years, 2006–2025. Highs, lows and precipitation are in the chart at the top.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Feels like (high) | 3.5 °C | 4.7 °C | 8.4 °C | 14.1 °C | 19.4 °C | 26 °C | 29 °C | 28.5 °C | 22.1 °C | 15.8 °C | 9.5 °C | 5 °C |
| Days with heavy rain | 3.4 days | 3.9 days | 4 days | 3.8 days | 5.2 days | 3.5 days | 3.3 days | 4 days | 5.4 days | 5.2 days | 6.2 days | 4.3 days |
| Time rain usually falls | 3 pm | 2 am | 10 pm | 4 pm | 3 pm | 4 pm | 4 pm | 5 pm | 10 am | 11 am | 2 am | 2 pm |
| Sunshine per day | 5.6 h | 6.8 h | 8.8 h | 10.7 h | 11.6 h | 12.9 h | 13.3 h | 12.3 h | 10 h | 8 h | 5.9 h | 5.3 h |
| Relative humidity | 78% | 75% | 71% | 71% | 74% | 73% | 71% | 72% | 75% | 78% | 80% | 80% |
Air quality
Averaged over a shorter period (2022–2025) than the twenty-year averages above, and not counted towards good or best months.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Air pollution (PM2.5) 2022–2025 | 11.3 µg/m³ | 15.5 µg/m³ | 12.4 µg/m³ | 11.4 µg/m³ | 11.9 µg/m³ | 13.4 µg/m³ | 11 µg/m³ | 11.3 µg/m³ | 9 µg/m³ | 11.6 µg/m³ | 10.5 µg/m³ | 11.2 µg/m³ |
| Air pollution (PM2.5, daily peak) 2022–2025 | 17.9 µg/m³ | 23.5 µg/m³ | 18.8 µg/m³ | 17.7 µg/m³ | 17.6 µg/m³ | 18.6 µg/m³ | 15.6 µg/m³ | 16.2 µg/m³ | 13.2 µg/m³ | 17.3 µg/m³ | 16.1 µg/m³ | 18.1 µg/m³ |
- Good 15 µg/m³ or less
- Fair 15 to 25 µg/m³
- Moderate 25 to 37.5 µg/m³
- Poor 37.5 to 50 µg/m³
- Very poor 50 to 75 µg/m³
- Extremely poor over 75 µg/m³
Each figure is compared with the World Health Organization's guideline for a day's air, 15 µg/m³ or less, and with its interim targets above that. The words are ours: the WHO does not name its steps. The figures are modelled monthly averages, so single days can be well above them. The daily peak is the average of each day's highest hour, shaded on the same scale.
World Heritage sites nearby
UNESCO World Heritage sites within 25 km, nearest first.
- Škocjan Caves
17 km away