The city is located in the north-east of Italy and is the capital of the Friuli-Venezia Giulia region.
Being on the coast and outside of the Po Valley, it has a relatively mild climate. However, this city is particularly subject to the
,the wind that is channeled through the mountain ranges when cold air masses arrive from eastern Europe. So, the wind rushes to the Gulf of Trieste, with gusts above 100 kilometers (60 miles) per hour, and can also lower the temperature below freezing from December to early March.
of the coldest month (January) is of 6.5 °C (43.5 °F), that of the warmest months (July and August) is of 25 °C (77 °F).
fall in a typical year, and there can be thunderstorms in late spring and summer.
, from December to February or early March, is quite mild, and is characterized by sunny periods alternating with rainy periods.
, in which the bora blows and the temperature drops to around freezing even during the day.
During the most intense cold spells, the temperature can drop as low as -7 °C (19.5 °F), and can remain below freezing even during the day, as happened for example in January 1985, February 1991, December 1996 and February 2012. However, in the past, the temperature had dropped to -10.5 °C (13 °F) in February 1956 and to -9.5 °C (15 °F) in January 1963.
Even if the temperatures do not reach the values of the Po Valley, the wind increases the sensation of cold. For example, with a wind of 100 kph (60 mph), if the air temperature is 0 °C (32 °F), the perceived temperature (
) will be -10.5 °C (13 °F), while if the air temperature is -5 °C (23 °F), the perceived temperature will be -18 °C (-0.5 °F).
in Trieste is rare because the Bora is originally a dry wind, though sometimes its rarer version, called "dark Bora", can bring some light snowfalls. On average, less than 10 cm (4 in) fall per year. On the other hand, when the wind blows from the sea, the temperature is mild and therefore rain falls instead of snow.
is hot and humid, but tempered by the breezes.
, which are becoming increasingly more frequent, the temperature can reach or exceed 35 °C (95 °F). The heat record is 38 °C (100.5 °F) and was recorded in the months of August 2015 and 2017. The temperature of 37 °C recorded in late June 2019 and in August 2003 are also worth mentioning.
temperature ranges between 10 °C (50 °F) and 26 °C (79 °F). The sea is warm enough for swimming from July to September.
to visit Trieste are spring and autumn, and in particular, from mid-April to mid-June and in the month of September. However, in both periods, some rainy days are possible. The best months to go to the beach are July and August. In June, the sea is still a little cool.
. Here are the average temperatures.
January, the coldest month of the year, is generally a quite cold month. The average temperature is of
6.5 °C, with a minimum of
4.1 °C and a maximum of
8.9 °C.
On the coldest nights of the month, the temperature usually drops to around
-1.5 °C. However, it dropped to
-7 °C in January 2017.
On the warmest days of the month, the temperature usually reaches around
14 °C. However, it reached
18.2 °C in January 2018.
Precipitation amounts to
60 mm, distributed over 7 days.
The day lasts on average 9 hours and 10 minutes.
There are on average 3 hours of sunshine per day. So, the sun shines 34% of the time.
The average humidity is 67%.
The average wind speed is of
10.1 kph.
The average sea temperature is of
11.6 °C. Therefore, the sea is very cold for swimming.
February is generally a quite mild month. The average temperature is of
6.8 °C, with a minimum of
4.1 °C and a maximum of
9.5 °C.
On the coldest nights of the month, the temperature usually drops to around
-1 °C. However, it dropped to
-7.2 °C in February 2012.
On the warmest days of the month, the temperature usually reaches around
15 °C. However, it reached
18.2 °C in February 2001.
Precipitation amounts to
55 mm, distributed over 6 days.
The day lasts on average 10 hours and 25 minutes.
There are on average 4 hours of sunshine per day. So, the sun shines 40% of the time.
The average humidity is 64%.
The average wind speed is of
10.1 kph.
The average sea temperature is of
10.4 °C. Therefore, the sea is very cold for swimming.
March is generally a mild month. The average temperature is of
10.3 °C, with a minimum of
7 °C and a maximum of
13.5 °C.
On the coldest nights of the month, the temperature usually drops to around
2 °C. However, it dropped to
-6.4 °C in March 2005.
On the warmest days of the month, the temperature usually reaches around
19.5 °C. However, it reached
24 °C in March 2019.
Precipitation amounts to
65 mm, distributed over 7 days.
The day lasts on average 12 hours and 0 minutes.
There are on average 4.5 hours of sunshine per day. So, the sun shines 38% of the time.
The average humidity is 62%.
The average wind speed is of
8.9 kph.
The average sea temperature is of
11 °C. Therefore, the sea is very cold for swimming.
April is generally a mild month. The average temperature is of
14.1 °C, with a minimum of
10.6 °C and a maximum of
17.6 °C.
On the coldest nights of the month, the temperature usually drops to around
5 °C. However, it dropped to
1.3 °C in April 2003.
On the warmest days of the month, the temperature usually reaches around
24 °C. However, it reached
29.8 °C in April 2012.
Precipitation amounts to
85 mm, distributed over 8 days.
The day lasts on average 13 hours and 35 minutes.
There are on average 6 hours of sunshine per day. So, the sun shines 43% of the time.
The average humidity is 63%.
The average wind speed is of
7.3 kph.
The average sea temperature is of
13.7 °C. Therefore, the sea is very cold for swimming.
May is generally a warm month. The average temperature is of
18.6 °C, with a minimum of
14.8 °C and a maximum of
22.3 °C.
On the coldest nights of the month, the temperature usually drops to around
10 °C. However, it dropped to
7 °C in May 1997.
On the warmest days of the month, the temperature usually reaches around
28 °C. However, it reached
32.2 °C in May 2003.
Precipitation amounts to
85 mm, distributed over 9 days.
The day lasts on average 15 hours and 0 minutes. So the days are long.
There are on average 7.5 hours of sunshine per day. So, the sun shines 49% of the time.
The average humidity is 63%.
The average wind speed is of
6.7 kph.
The average sea temperature is of
18.1 °C. Therefore, the sea is cold for swimming.
June is generally a warm to hot month. The average temperature is of
22.7 °C, with a minimum of
18.8 °C and a maximum of
26.5 °C.
On the coldest nights of the month, the temperature usually drops to around
13 °C. However, it dropped to
9.2 °C in June 2006.
On the warmest days of the month, the temperature usually reaches around
32 °C. However, it reached
36.8 °C in June 2019.
Precipitation amounts to
100 mm, distributed over 9 days.
The day lasts on average 15 hours and 35 minutes. So the days are long. June 21, the summer solstice, is the longest day of the year in the Northern Hemisphere.
There are on average 8 hours of sunshine per day. So, the sun shines 52% of the time.
The average humidity is 63%.
The average wind speed is of
6.8 kph.
The average sea temperature is of
22.4 °C. Therefore, the sea can be considered barely acceptable for swimming.
July is generally a warm to hot month. The average temperature is of
25 °C, with a minimum of
21 °C and a maximum of
29.1 °C.
On the coldest nights of the month, the temperature usually drops to around
15.5 °C. However, it dropped to
13.2 °C in July 2007.
On the warmest days of the month, the temperature usually reaches around
34 °C. However, it reached
37.6 °C in July 2012.
Precipitation amounts to
60 mm, distributed over 6 days.
The day lasts on average 15 hours and 20 minutes. So the days are long.
There are on average 9.5 hours of sunshine per day. So, the sun shines 61% of the time.
The average humidity is 61%.
The average wind speed is of
7.1 kph.
The average sea temperature is of
25.1 °C. Therefore, the sea is warm enough for swimming.
August, the hottest month of the year, is generally a warm to hot month. The average temperature is of
25.1 °C, with a minimum of
21.2 °C and a maximum of
29 °C.
On the coldest nights of the month, the temperature usually drops to around
16 °C. However, it dropped to
11 °C in August 1995.
On the warmest days of the month, the temperature usually reaches around
33.5 °C. However, it reached
38 °C in August 2017.
Precipitation amounts to
85 mm, distributed over 6 days.
The day lasts on average 14 hours and 0 minutes.
There are on average 8.5 hours of sunshine per day. So, the sun shines 60% of the time.
The average humidity is 61%.
The average wind speed is of
7.4 kph.
The average sea temperature is of
25.6 °C. Therefore, the sea is warm enough for swimming.
September is generally a warm month. The average temperature is of
20.7 °C, with a minimum of
17.1 °C and a maximum of
24.2 °C.
On the coldest nights of the month, the temperature usually drops to around
12 °C. However, it dropped to
9.2 °C in September 2001.
On the warmest days of the month, the temperature usually reaches around
29 °C. However, it reached
33.8 °C in September 2016.
Precipitation amounts to
105 mm, distributed over 8 days.
The day lasts on average 12 hours and 30 minutes.
There are on average 7 hours of sunshine per day. So, the sun shines 56% of the time.
The average humidity is 63%.
The average wind speed is of
8.6 kph.
The average sea temperature is of
23 °C. Therefore, the sea can be considered barely acceptable for swimming.
October is generally a very mild month. The average temperature is of
16.1 °C, with a minimum of
13.2 °C and a maximum of
19 °C.
On the coldest nights of the month, the temperature usually drops to around
7.5 °C. However, it dropped to
3.8 °C in October 2003.
On the warmest days of the month, the temperature usually reaches around
24 °C. However, it reached
30.8 °C in October 2011.
Precipitation amounts to
110 mm, distributed over 9 days.
The day lasts on average 10 hours and 55 minutes.
There are on average 5.5 hours of sunshine per day. So, the sun shines 49% of the time.
The average humidity is 68%.
The average wind speed is of
9.4 kph.
The average sea temperature is of
19.6 °C. Therefore, the sea is very cool for swimming.
November is generally a mild month. The average temperature is of
11.7 °C, with a minimum of
9.2 °C and a maximum of
14.2 °C.
On the coldest nights of the month, the temperature usually drops to around
3 °C. However, it dropped to
-1.3 °C in November 1993.
On the warmest days of the month, the temperature usually reaches around
20 °C. However, it reached
24.4 °C in November 2004.
Precipitation amounts to
105 mm, distributed over 9 days.
The day lasts on average 9 hours and 30 minutes.
There are on average 3.5 hours of sunshine per day. So, the sun shines 35% of the time.
The average humidity is 70%.
The average wind speed is of
9.3 kph.
The average sea temperature is of
16.5 °C. Therefore, the sea is cold for swimming.
December is generally a quite mild month. The average temperature is of
7.7 °C, with a minimum of
5.2 °C and a maximum of
10.2 °C.
On the coldest nights of the month, the temperature usually drops to around
-1 °C. However, it dropped to
-7.2 °C in December 1996.
On the warmest days of the month, the temperature usually reaches around
15.5 °C. However, it reached
18.4 °C in December 2016.
Precipitation amounts to
90 mm, distributed over 8 days.
The day lasts on average 8 hours and 50 minutes. December 21, the winter solstice, is the shortest day of the year in the Northern Hemisphere.
There are on average 2.5 hours of sunshine per day. So, the sun shines 31% of the time.
The average humidity is 66%.
The average wind speed is of
10.7 kph.
The average sea temperature is of
13.9 °C. Therefore, the sea is very cold for swimming.