Trieste weather in December
December in Trieste: cold, soaked, with clean air — a gamble, with 13 rainy days.
#12 of 12 months in Trieste · #663 of 897 destinations to visit in December · comfort 58/100 (tier D)
Updated June 2026 · climate normals from ERA5 reanalysis
Traveller notes on Trieste in December
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Trieste climate normals — December
| Daytime high | 10°C / 49°F | 🧥 cold |
|---|---|---|
| Nighttime low | 4°C / 40°F | |
| Rainfall | 173 mm / 6.8 in | ⛈ soaked |
| Rainy days | 13 days | |
| Humidity | 86% | 💦 very humid |
| Dew point | 5°C / 41°F | |
| Sunshine | 4.2 h/day | |
| Daylight | 8.8 h | |
| Wind | 15 km/h / 9 mph | |
| Snowfall | 6.3 cm / 2.5 in | |
| Air quality (US AQI) | 42 | 🍃 good |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
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Trieste in December — FAQ
- Is December a good time to visit Trieste?
- December in Trieste: cold, soaked, with clean air — a gamble, with 13 rainy days. It ranks #12 of 12 months for Trieste on SeasonMap's comfort score (58/100).
- What is the weather like in Trieste in December?
- In December, Trieste averages a daily high of 9.7°C and a low of 4.2°C, with about 172.9 mm of rain over roughly 13.2 rainy days.
- What is the air quality in Trieste in December?
- Trieste has a mean US Air Quality Index of about 42 in December.
- Does it snow in Trieste in December?
- Trieste sees roughly 6.3 cm of snowfall in December.