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Trieste in December: Weather, Average temperature and Climate

Planning a trip and want to know what the weather in Trieste in December will be like? Take a look at our weather guide for Trieste, based on historical data.
Check flight prices to Trieste on Avionero:
December

Weather in Trieste in December 2024

Good Weather
Chill
🌧️
Rainy
🌊
Cold water
Planning a trip to Trieste in December? You are in luck! The weather is generally good, with an average maximum temperature of +50°F and approximately 9 sunny days. Just be prepared for some rain, as there are usually around 12 rainy days and 113 mm of precipitation. Expect good weather and pack accordingly to enjoy the outdoors. Search flights in one click on Avionero.

Average weather

☀️
+50°F
Avg. max. temperature
+18°F
Min.
+66°F
Max.
113 mm
Total precipitation
70%
Avg. humidity
2 m/s
Avg. wind
9 ☀️
Sunny Days
9 ⛅️
Cloudy
12 🌦
Rainy
Our opinion: Trieste has good weather in December.

Average temperature in Trieste in December

Here are the expected maximum, average and minimum temperatures in Trieste for December based on the historical data.
Last Year
Historical Data

Going from a maximum of +66°F during the day to a minimum of +34°F during the night, the temperature in December averages around +54°F.

The average maximum temperature goes down 28% by the end of the month, compared with the beginning of the month, from +66°F to +57°F.

Is Trieste warm or cold in December?

Trieste is typically chill in December.

Maximum temperatures go down compared to the previous month from +57°F to +50°F. The minimum temperature also goes down from +46°F to +39°F.

Pack a jumper and a jacket as there will be cooler temperatures.

December is one of the coolest months in Trieste, here is the comparison with other months:

Water temperature in Trieste in December

Water in Trieste in December is Cold. It varies from +52°F to +60°F, with an average of +56°F. Note that the air temperature is lower than the water temperature, averaging around +50°F.

In December, water temperatures are average relative to the rest of the year:

The warmest water temperatures in Trieste are reached in August, when the average sea temperature rises to +77°F. The coldest water temperatures are in February, with an average of +49°F.

Can you swim in Trieste in December?

We would not recommend swimming in Trieste in December, the water is very cold (+56°F on average). Consider swimming only if you are an experienced cold-water swimmer with proper gear.
🦭
Cold
Below +61°F
🏄‍♂️
Fresh
61°F - 70°F
🏊
Comfortable
70°F - 77°F
👙
Warm
77°F - 82°F
🔥
Very warm
+82°C and up
You will need a full-body wetsuit, cap, gloves, a warm change of clothes, and a hot drink ready for after your swim.

Climate in Trieste in December

Trieste weather looks like this, on average, in December and the surrounding months.
NovemberDecemberJanuary
Avg. temperature
+57°F+50°F+48°F
Min. temperature
+25°F+18°F+10°F
Max. temperature
+75°F+66°F+63°F
Rainfall
163 mm113 mm81 mm
Wind
2 m/s2 m/s2 m/s
Avg. water temperature
+61°F+56°F+51°F
Humidity
71%70%69%
Air pressure
1016 HPa1018 HPa1018 HPa
Sunny days
799
Cloudy days
8910
Rainy days
131211
Snowy days
001

December often has better weather than November. It’s getting colder in December. From +57°F in the day, the average maximum temperature lowers to +50°F. As December arrives, the amount of rainfall goes down. On average, the rainfall volume decreases from 163 mm to 113 mm. It feels drier, as humidity decreases from 71% to 70%. The average wind speed doesn’t change much during December, staying around 2 m/s. The good news is there are likely to be more sunny days in December, from 7 to 9.

January brings much the same weather, it remains good.

Wind

Wind speed in Trieste in December based on historical data.
Last Year
Historical Data

The average wind speed is 2 m/s getting up to 6 m/s which is a medium breeze. You can feel it, especially getting out of the water.

The average wind speed in Trieste is gradually decreasing during December, going from 2 m/s to 1 m/s over the course of the month.

Rain

Amount of rainfall in mm during December in Trieste based on historical data.
Last Year
Historical Data
Typically, there is a 35% chance of rain on an average day in December, with total rainfall of approximately 126 mm. The maximum amount of rainfall per day is around 43 mm, which is moderate rain. December is a pretty wet month with over 11 rainy days, so don’t forget to pack an umbrella, raincoat, and a pair of wellies.
Here’s how December is compared with other months in the amount of precipitation, total mm:
Trieste wettest month is November, where a typical day has a 43% chance of precipitation and 163 mm of rainfall per day. July, on the other hand, is the driest month with a mere 26% chance of precipitation and 72 mm of rainfall per day.

How was the weather last December in Trieste?

This is the weather in Trieste in December 2023:
1 December
🌧️
+67°F
2 December
🌧️
+65°F
3 December
☀️
+45°F
4 December
☁️
+44°F
5 December
☁️
+49°F
6 December
☀️
+50°F
7 December
☀️
+52°F
8 December
☁️
+50°F
9 December
🌧️
+50°F
10 December
☀️
+51°F
11 December
☁️
+56°F
12 December
☁️
+55°F
13 December
🌧️
+55°F
14 December
☀️
+55°F
15 December
☀️
+55°F
16 December
☀️
+52°F
17 December
☀️
+55°F
18 December
☀️
+59°F
19 December
☀️
+60°F
20 December
☁️
+54°F
21 December
☁️
+52°F
22 December
☁️
+55°F
23 December
☁️
+60°F
24 December
☁️
+57°F
25 December
☁️
+57°F
26 December
☁️
+54°F
27 December
☁️
+54°F
28 December
☁️
+54°F
29 December
☁️
+53°F
30 December
☁️
+54°F
31 December
🌧️
+57°F
In December 2023 Trieste had 10 sunny days, 16 cloudy days, and 5 rainy days. The average maximum temperature was +54°F, with an absolute maximum of +66°F and a minimum of +45°F. The average humidity was 85%, with a maximum of 97% and a minimum of 57%. The average wind speed was 2 m/s, with a maximum of 9 m/s and a minimum of 0 m/s.
Are you planning a trip in December?

Climate Change Over the Years

This is how Trieste climate has changed over the last 43 years.

The climate in Trieste in December has not changed that much over the last 43 years.

The average temperature was the lowest in 1980 (+63°F) and the highest in 2022 (+69°F). The driest year was 2003 with only 712 mm of rainfall, and the wettest year was 2019 with 2509 mm.

FAQ

Frequently asked questions about the weather in Trieste in December:

Is December a good time to visit Trieste?

December is a really good time to go to Trieste. The weather is nice so plan your packing around outdoor activities and exploring. Check out other good time to visit Trieste.

Can you sunbathe in Trieste in December?

Not really, December is not the best time to sunbathe, unless you visit a local solarium.

Can you swim in Trieste in December?

Swimming in Trieste in December is challenging and not recommended for inexperienced swimmers or without proper equipment and preparation.

Is Trieste rainy in December?

Trieste is often rainy in December. You may get a bit damp when outside, so pack an umbrella, and maybe even a raincoat.

Is it sunny in Trieste in December?

Usually, it’s not very sunny in Trieste in December, often it’s pretty cloudy. Pack for any eventuality; layering can help reduce the number of bulky items needed.

Other cities in Italy

Check out the weather for other cities in Italy.

Monthly weather in Trieste

Source of the data

For this page, we’ve looked at the typical weather in Trieste, based on historical hourly weather data from January 1, 1979, to December 31, 2023.

For past dates, we show actual recorded data at the location at that time. Forecasts are based on recorded weather during that day of the year, averaged over the total years for which we have records (unless stated otherwise). The daily temperature is the highest recorded temperature in the shadow during that day.