20.09
sun
sun
Day
75°F
NE 2 mph
Precip.
3%
3%
Night
66°F
W 5 mph
Precip.
21%
21%
21.09
mon
mon
Day
73°F
W 8 mph
Precip.
14%
14%
Night
63°F
SW 11 mph
Precip.
6%
6%
22.09
tue
tue
Day
66°F
SW 11 mph
Precip.
2%
2%
Night
59°F
W 10 mph
Precip.
4%
4%
23.09
wed
wed
Day
66°F
W 4 mph
Precip.
1%
1%
Night
57°F
W 8 mph
Precip.
5%
5%
24.09
thu
thu
Day
68°F
NW 4 mph
Precip.
7%
7%
Night
59°F
W 6 mph
Precip.
5%
5%
25.09
fri
fri
Day
70°F
SW 12 mph
Precip.
1%
1%
Night
59°F
SW 9 mph
Precip.
4%
4%
26.09
sat
sat
Day
70°F
SW 9 mph
Precip.
1%
1%
Night
59°F
SW 9 mph
Precip.
4%
4%
27.09
sun
sun
Day
70°F
SW 11 mph
Precip.
1%
1%
Night
59°F
SW 9 mph
Precip.
5%
5%
28.09
mon
mon
Day
72°F
W 7 mph
Precip.
1%
1%
Night
59°F
W 7 mph
Precip.
5%
5%
29.09
tue
tue
Day
72°F
NW 3 mph
Precip.
6%
6%
Night
61°F
W 6 mph
Precip.
10%
10%
30.09
wed
wed
Day
73°F
SW 2 mph
Precip.
8%
8%
Night
61°F
W 9 mph
Precip.
3%
3%
01.10
thu
thu
Day
73°F
W 6 mph
Precip.
1%
1%
Night
61°F
W 8 mph
Precip.
11%
11%
02.10
fri
fri
Day
72°F
NW 4 mph
Precip.
5%
5%
Night
64°F
W 4 mph
Precip.
9%
9%
Sea water temperature in September, °F
Show year:
2026
2025
2024
The average sea water temperature in September of 2026 was 78.8°F. The highest and lowest sea temperatures during the month were 81.7°F and 75.6°F.
Sea water temperature in October, °F
Show year:
2025
2024
2023
The average sea water temperature in October of 2025 was 66.9°F. The highest and lowest sea temperatures during the month were 72.3°F and 62.6°F.
Air temperature in Trieste, °F
Precipitation total in Trieste, in.
* Charts above show average data for the last 3 years.
Best time for vacation in Trieste
Trieste on a weather map
Places in Italy:
Name
°F
24 Hours Forecast
Trieste
Local time: 00:20
September 20, sunday
0300
63°F
W
6 mph
6 mph
0600
63°F
W
6 mph
6 mph
0900
66°F
SW
4 mph
4 mph
1200
75°F
NE
2 mph
2 mph
1500
73°F
NE
6 mph
6 mph
1800
70°F
NE
3 mph
3 mph
2100
68°F
W
4 mph
4 mph
September 21, monday
0000
66°F
W
5 mph
5 mph
