Trieste weather in December
Temperature, sea and sunshine in December: long-term averages from 30 years of weather data, not a forecast.
Holiday weather in December
Poor
Best time to visit: May – September
What is the weather like in Trieste in December?
In December, Trieste is cold: daytime highs average 9 °C, and nights cool down to about 4 °C. The sea averages 13.2 °C – swimming is only for the hardy. Expect around 5 hours of sunshine a day. Rain is frequent, with about 10 rainy days and 110 mm in total. All in all, December is not an ideal month for a holiday in Trieste.
December compared
How the weather changes from November to January. Tap a month to open it.
| NovemberNov | DecemberDec | JanuaryJan | |
|---|---|---|---|
| Score | 39 | 26 | 24 |
| Day | 13° | 9° | 8° |
| Night | 8° | 4° | 2° |
| Sea | 16° | 13° | 11° |
| Sun | 4 h | 5 h | 5 h |
| Rain days | 13 | 10 | 10 |
More details for December
- Daylight
- 8 h 43 min07:38 – 16:22
- UV index
- 1 · lowclear sky, noon (estimate)All months
- Muggy days
- 0 daysdew point 18 °C or moreAll months
- Wind
- 15 km/haverage daily peakAll months
- Cloud cover
- 59 %on averageAll months
- Hot days
- 0 days30 °C or moreAll months
- Snow days
- 1 day1 cm or more of fresh snow
- Time zone
- UTC+1Europe/Rome
How the score comes together
- Temperatureweight 50 %6 %
- Sunshineweight 20 %27 %
- Few rainy daysweight 30 %58 %
Each factor is rated from 0 to 100 % and weighted for the travel style “City break”.
What to pack in December
- Warm jacket
- Rain jacket or umbrella
Trieste in December: quick answers
Is Trieste hot in December?
No. In December, Trieste is cold: daytime highs average 9 °C and nights drop to about 4 °C.
Can you swim in Trieste in December?
Only if you don't mind cold water: in December the sea averages just 13.2 °C. Comfortable swimming is possible from June to September.
Does it rain much in Trieste in December?
Rain is frequent, with about 10 rainy days and 110 mm in total.
Trieste month by month
The whole year in TriesteAll destinations: ItalyWhere to go in DecemberSea temperature in December
Climate averages 1996–2025, not a forecast. Data: Copernicus ERA5 / ERA5-Land via Open-Meteo.com (CC BY 4.0), NOAA OISST, WMO 1991–2020 (NOAA NCEI), GeoNames (CC BY 4.0). Sources & licences