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September

Trieste Weather in September with Sea Temperature

September weather in Trieste includes average daytime air +24°C, nighttime +16°C, average sea temperature +22°C. Daily water temperatures usually range from +20°C to +24°C, which is mild for beach planning. The tables below also show air temperature, wind, rain and humidity; for near-term water data, open the current 30-day water temperature forecast.

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Averaged values across several years

Daily air temperature for the month

Day Night

Daily sea water temperature for the month

Water

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September	Day	Night	Sea t°	Wind	Precip	Humidity
1Mon	+26°C	+17°C	+24°C	3 m/s	0.5 mm	67%
2Tue	+27°C	+17°C	+24°C	2 m/s	0.2 mm	65%
3Wed	+26°C	+17°C	+24°C	2 m/s	0 mm	68%
4Thu	+27°C	+17°C	+23°C	2 m/s	0 mm	66%
5Fri	+27°C	+18°C	+23°C	3 m/s	0 mm	64%
6Sat	+27°C	+17°C	+23°C	3 m/s	0.1 mm	67%
7Sun	+27°C	+17°C	+23°C	3 m/s	0 mm	64%
8Mon	+26°C	+18°C	+23°C	3 m/s	0.4 mm	64%
9Tue	+26°C	+17°C	+23°C	2 m/s	1.7 mm	68%
10Wed	+26°C	+17°C	+23°C	2 m/s	1.7 mm	68%
11Thu	+26°C	+17°C	+23°C	2 m/s	0.6 mm	68%
12Fri	+26°C	+16°C	+23°C	3 m/s	1.6 mm	68%
13Sat	+25°C	+17°C	+22°C	3 m/s	1.1 mm	65%
14Sun	+25°C	+17°C	+22°C	3 m/s	0.9 mm	69%
15Mon	+25°C	+17°C	+22°C	3 m/s	1 mm	70%
16Tue	+25°C	+16°C	+22°C	2 m/s	1.2 mm	72%
17Wed	+21°C	+15°C	+22°C	4 m/s	2.2 mm	77%
18Thu	+23°C	+15°C	+22°C	4 m/s	0 mm	72%
19Fri	+23°C	+16°C	+22°C	3 m/s	1.7 mm	71%
20Sat	+23°C	+16°C	+22°C	3 m/s	0.1 mm	69%
21Sun	+23°C	+15°C	+21°C	3 m/s	1 mm	68%
22Mon	+22°C	+15°C	+21°C	2 m/s	3.8 mm	70%
23Tue	+21°C	+15°C	+21°C	2 m/s	1.8 mm	75%
24Wed	+21°C	+14°C	+21°C	3 m/s	1 mm	80%
25Thu	+21°C	+14°C	+21°C	3 m/s	4.5 mm	82%
26Fri	+20°C	+14°C	+21°C	3 m/s	1.3 mm	81%
27Sat	+22°C	+15°C	+21°C	3 m/s	0.4 mm	74%
28Sun	+21°C	+14°C	+21°C	3 m/s	1.8 mm	77%
29Mon	+21°C	+13°C	+21°C	2 m/s	0.5 mm	70%
30Tue	+19°C	+13°C	+20°C	3 m/s	1 mm	72%

Sea water temperature by months

Water +22°C

Day and night air temperature

Day +24°C Night +16°C

Weather highs and lows in Trieste for september

Warmest day: 5 september, +27°C
Coldest night: 30 september, +13°C
Max precipitation: 25 september, 4.5 mm
Warmest sea water: 1 september, +24°C
Coldest sea water: 30 september, +20°C

Climate in Trieste in september

Average daytime temperature: +24°C
Average nighttime temperature: +16°C
Sea water temperature: —
Precipitation (monthly average): 31.9 mm
Days with precipitation: 6.7
Humidity: 70%
Wind: 3 m/s
Data: 6 years / coverage 100%

Daily air temperature for the month

Day Night

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September	Day	Night	Sea t°	Wind	Precip	Humidity
1Mon	+25°C	+16°C	—	2-3 m/s, W	0 mm	72%
2Tue	+24°C	+17°C	—	2-3 m/s, SE	1 mm	84%
3Wed	+26°C	+16°C	—	2 m/s, E	0 mm	77%
4Thu	+28°C	+17°C	—	2 m/s, WNW	0 mm	71%
5Fri	+26°C	+17°C	—	2 m/s, WSW	0 mm	71%
6Sat	+25°C	+15°C	—	3 m/s, NE	0 mm	77%
7Sun	+25°C	+15°C	—	2-3 m/s, NW	0 mm	71%
8Mon	+25°C	+15°C	—	2 m/s, W	0 mm	69%
9Tue	+24°C	+18°C	—	1-2 m/s, SSE	0 mm	70%
10Wed	+20°C	+18°C	—	2-3 m/s, NE	6.6 mm	93%
11Thu	+22°C	+17°C	—	2-3 m/s, S	3.2 mm	89%
12Fri	+25°C	+16°C	—	2-3 m/s, S	0.4 mm	79%
13Sat	+24°C	+16°C	—	2-3 m/s, SW	0 mm	73%
14Sun	+22°C	+16°C	—	2 m/s, SW	2.5 mm	88%
15Mon	+24°C	+15°C	—	2 m/s, W	0 mm	79%
16Tue	+23°C	+15°C	—	2-3 m/s, SSW	1.2 mm	82%
17Wed	+23°C	+13°C	—	4-5 m/s, NE	0.1 mm	73%
18Thu	+25°C	+14°C	—	1-3 m/s, NNE	0 mm	69%
19Fri	+27°C	+16°C	—	1-2 m/s, W	0 mm	68%
20Sat	+27°C	+18°C	—	2 m/s, W	0 mm	70%
21Sun	+25°C	+18°C	—	1-2 m/s, WSW	0 mm	72%
22Mon	+25°C	+17°C	—	2-4 m/s, SW	0.7 mm	75%
23Tue	+21°C	+17°C	—	2-3 m/s, ENE	1.2 mm	88%
24Wed	+20°C	+14°C	—	3-4 m/s, E	2.9 mm	88%
25Thu	+20°C	+13°C	—	2-3 m/s, SW	0.8 mm	84%
26Fri	+19°C	+13°C	—	2 m/s, NW	0.4 mm	84%
27Sat	+22°C	+13°C	—	2-3 m/s, ENE	0 mm	75%
28Sun	+22°C	+12°C	—	3 m/s, ENE	0 mm	72%
29Mon	+20°C	+12°C	—	2-3 m/s, NE	0 mm	66%
30Tue	+14°C	+11°C	—	4-5 m/s, ENE	0.2 mm	75%

Weather highs and lows in Trieste for september

Warmest day: 4 september, +28°C
Coldest night: 30 september, +11°C
Max precipitation: 10 september, 6.6 mm
Warmest water: —
Coldest water: —

Climate in Trieste in september

Year: 2025
Average daytime temperature: +23°C
Average nighttime temperature: +15°C
Water temperature: —
Precipitation (month): 21.2 mm
Days with precipitation: 7
Humidity: 77%
Wind: 2 m/s

Daily air temperature for the month

Day Night

Daily sea water temperature for the month

Water

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September	Day	Night	Sea t°	Wind	Precip	Humidity
1Sun	+34°C	+22°C	+24°C	2 m/s, W	0 mm	44%
2Mon	+32°C	+22°C	+24°C	2-3 m/s, W	0 mm	46%
3Tue	+29°C	+20°C	+24°C	2 m/s, W	0 mm	68%
4Wed	+29°C	+19°C	+23°C	2 m/s, W	0 mm	64%
5Thu	+29°C	+19°C	+23°C	2 m/s, WSW	0 mm	66%
6Fri	+24°C	+18°C	+23°C	1-2 m/s, SW	0.2 mm	83%
7Sat	+26°C	+17°C	+23°C	2 m/s, WSW	0 mm	76%
8Sun	+26°C	+18°C	+23°C	2-3 m/s, W	0.2 mm	80%
9Mon	+22°C	+17°C	+23°C	3-4 m/s, WSW	7.4 mm	90%
10Tue	+26°C	+15°C	+23°C	2 m/s, NW	0 mm	70%
11Wed	+24°C	+17°C	+23°C	2 m/s, W	0 mm	66%
12Thu	+19°C	+11°C	+23°C	5-8 m/s, SSE	8.9 mm	87%
13Fri	+16°C	+11°C	+22°C	5-8 m/s, NNE	6.9 mm	74%
14Sat	+17°C	+11°C	+22°C	2 m/s, NW	1.3 mm	74%
15Sun	+18°C	+12°C	+22°C	1-2 m/s, SSE	0.1 mm	65%
16Mon	+20°C	+11°C	+22°C	2 m/s, NW	0.5 mm	60%
17Tue	+17°C	+12°C	+22°C	6-9 m/s, ENE	0 mm	70%
18Wed	+22°C	+13°C	+22°C	8 m/s, ENE	0 mm	62%
19Thu	+22°C	+17°C	+22°C	7-8 m/s, ENE	0 mm	58%
20Fri	+21°C	+16°C	+22°C	5-6 m/s, ENE	0 mm	62%
21Sat	+24°C	+14°C	+21°C	4-5 m/s, NE	0 mm	65%
22Sun	+23°C	+13°C	+21°C	2 m/s, WSW	0 mm	63%
23Mon	+22°C	+14°C	+21°C	1-2 m/s, WSW	0 mm	69%
24Tue	+20°C	+15°C	+21°C	3-4 m/s, SSW	2.2 mm	90%
25Wed	+20°C	+14°C	+21°C	3-4 m/s, SSW	0.9 mm	89%
26Thu	+19°C	+15°C	+21°C	3-4 m/s, SW	1.6 mm	89%
27Fri	+22°C	+17°C	+21°C	6 m/s, SSW	0.7 mm	82%
28Sat	+20°C	+13°C	+21°C	4-7 m/s, S	0 mm	82%
29Sun	+19°C	+11°C	+21°C	2-4 m/s, NE	0 mm	68%
30Mon	+18°C	+8°C	+20°C	2-3 m/s, N	0 mm	63%

Weather highs and lows in Trieste for september

Warmest day: 1 september, +34°C
Coldest night: 30 september, +8°C
Max precipitation: 12 september, 8.9 mm
Warmest water: 1 september, +24°C
Coldest water: 30 september, +20°C

Climate in Trieste in september

Year: 2024
Average daytime temperature: +23°C
Average nighttime temperature: +15°C
Water temperature: —
Precipitation (month): 30.9 mm
Days with precipitation: 6
Humidity: 71%
Wind: 3 m/s

Daily air temperature for the month

Day Night

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September	Day	Night	Sea t°	Wind	Precip	Humidity
1Fri	+24°C	+16°C	—	2 m/s, WSW	0.4 mm	74%
2Sat	+25°C	+16°C	—	2 m/s, W	0 mm	76%
3Sun	+26°C	+17°C	—	2 m/s, WNW	0 mm	74%
4Mon	+26°C	+18°C	—	4-5 m/s, ENE	0 mm	65%
5Tue	+25°C	+16°C	—	6-8 m/s, NE	0 mm	57%
6Wed	+28°C	+16°C	—	4-5 m/s, ENE	0 mm	59%
7Thu	+28°C	+17°C	—	4-5 m/s, ENE	0 mm	58%
8Fri	+29°C	+16°C	—	4-5 m/s, ENE	0 mm	52%
9Sat	+30°C	+16°C	—	3-4 m/s, ENE	0 mm	56%
10Sun	+30°C	+17°C	—	2-3 m/s, NNE	0 mm	56%
11Mon	+28°C	+16°C	—	2 m/s, W	0 mm	60%
12Tue	+27°C	+17°C	—	2 m/s, WSW	0 mm	64%
13Wed	+27°C	+18°C	—	2 m/s, WSW	0 mm	64%
14Thu	+27°C	+17°C	—	2 m/s, NW	1.7 mm	70%
15Fri	+26°C	+16°C	—	3-4 m/s, ENE	0 mm	80%
16Sat	+26°C	+16°C	—	2 m/s, W	0 mm	70%
17Sun	+24°C	+16°C	—	2 m/s, W	0 mm	77%
18Mon	+25°C	+17°C	—	1-2 m/s, W	0 mm	78%
19Tue	+23°C	+16°C	—	2-3 m/s, ESE	6.3 mm	85%
20Wed	+25°C	+15°C	—	2 m/s, SW	0 mm	79%
21Thu	+23°C	+17°C	—	3 m/s, SSW	1.4 mm	77%
22Fri	+22°C	+16°C	—	3-5 m/s, SSW	10.5 mm	90%
23Sat	+21°C	+15°C	—	3-6 m/s, S	6.8 mm	83%
24Sun	+21°C	+15°C	—	4-5 m/s, NE	0 mm	72%
25Mon	+23°C	+13°C	—	5-7 m/s, NE	0 mm	66%
26Tue	+26°C	+16°C	—	5-6 m/s, ENE	0 mm	72%
27Wed	+27°C	+17°C	—	5-7 m/s, ENE	0 mm	58%
28Thu	+26°C	+15°C	—	4-5 m/s, NE	0 mm	58%
29Fri	+26°C	+15°C	—	2-3 m/s, ENE	0 mm	62%
30Sat	+27°C	+16°C	—	2 m/s, NE	0 mm	60%

Weather highs and lows in Trieste for september

Warmest day: 9 september, +30°C
Coldest night: 25 september, +13°C
Max precipitation: 22 september, 10.5 mm
Warmest water: —
Coldest water: —

Climate in Trieste in september

Year: 2023
Average daytime temperature: +26°C
Average nighttime temperature: +16°C
Water temperature: —
Precipitation (month): 27.1 mm
Days with precipitation: 5
Humidity: 68%
Wind: 3 m/s

Daily air temperature for the month

Day Night

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September	Day	Night	Sea t°	Wind	Precip	Humidity
1Thu	+23°C	+18°C	—	6-7 m/s, ENE	0 mm	68%
2Fri	+27°C	+17°C	—	3-5 m/s, NE	0 mm	61%
3Sat	+25°C	+16°C	—	2 m/s, W	0 mm	66%
4Sun	+25°C	+17°C	—	2 m/s, W	0 mm	74%
5Mon	+29°C	+18°C	—	2-3 m/s, W	0 mm	69%
6Tue	+29°C	+18°C	—	2 m/s, W	0 mm	63%
7Wed	+28°C	+19°C	—	2-3 m/s, WSW	0.1 mm	61%
8Thu	+24°C	+20°C	—	3 m/s, S	2.1 mm	77%
9Fri	+25°C	+18°C	—	3-4 m/s, E	2.5 mm	85%
10Sat	+26°C	+17°C	—	2-3 m/s, ESE	3.5 mm	77%
11Sun	+26°C	+16°C	—	2-3 m/s, N	0.3 mm	69%
12Mon	+25°C	+16°C	—	2-3 m/s, W	0 mm	65%
13Tue	+24°C	+16°C	—	2 m/s, W	0 mm	68%
14Wed	+25°C	+19°C	—	3-6 m/s, SW	0 mm	74%
15Thu	+24°C	+20°C	—	3-4 m/s, SSW	5.7 mm	86%
16Fri	+24°C	+15°C	—	3-4 m/s, S	1.3 mm	90%
17Sat	+16°C	+13°C	—	6-8 m/s, ENE	9.4 mm	89%
18Sun	+19°C	+12°C	—	2 m/s, WSW	0.1 mm	80%
19Mon	+21°C	+13°C	—	2 m/s, NE	0 mm	70%
20Tue	+21°C	+13°C	—	3-4 m/s, NE	0 mm	68%
21Wed	+19°C	+13°C	—	5-6 m/s, ENE	0 mm	60%
22Thu	+20°C	+11°C	—	3 m/s, NE	0 mm	58%
23Fri	+20°C	+11°C	—	2-4 m/s, NNW	0 mm	60%
24Sat	+20°C	+11°C	—	3-4 m/s, SW	0.1 mm	73%
25Sun	+17°C	+14°C	—	3-4 m/s, ENE	3.7 mm	94%
26Mon	+18°C	+14°C	—	1 m/s, SSW	1.7 mm	90%
27Tue	+18°C	+14°C	—	3-4 m/s, E	0.6 mm	86%
28Wed	+18°C	+12°C	—	3-4 m/s, S	2.7 mm	88%
29Thu	+18°C	+14°C	—	3-4 m/s, SSW	2.9 mm	90%
30Fri	+19°C	+15°C	—	3-5 m/s, SSW	5.7 mm	89%

Weather highs and lows in Trieste for september

Warmest day: 5 september, +29°C
Coldest night: 22 september, +11°C
Max precipitation: 17 september, 9.4 mm
Warmest water: —
Coldest water: —

Climate in Trieste in september

Year: 2022
Average daytime temperature: +22°C
Average nighttime temperature: +15°C
Water temperature: —
Precipitation (month): 42.4 mm
Days with precipitation: 11
Humidity: 75%
Wind: 3 m/s

Daily air temperature for the month

Day Night

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September	Day	Night	Sea t°	Wind	Precip	Humidity
1Wed	+27°C	+16°C	—	2-3 m/s, NNE	0 mm	66%
2Thu	+27°C	+16°C	—	2-4 m/s, NNE	0 mm	57%
3Fri	+27°C	+16°C	—	2-3 m/s, NNE	0 mm	56%
4Sat	+28°C	+16°C	—	2-3 m/s, NW	0 mm	59%
5Sun	+29°C	+17°C	—	3-4 m/s, ENE	0 mm	53%
6Mon	+29°C	+17°C	—	3-4 m/s, ENE	0 mm	49%
7Tue	+29°C	+17°C	—	3 m/s, ENE	0 mm	48%
8Wed	+29°C	+18°C	—	4-5 m/s, ENE	0 mm	44%
9Thu	+28°C	+16°C	—	2-4 m/s, WNW	0 mm	42%
10Fri	+27°C	+16°C	—	2 m/s, W	0 mm	49%
11Sat	+27°C	+15°C	—	2 m/s, W	0 mm	57%
12Sun	+29°C	+17°C	—	2 m/s, NNE	0 mm	50%
13Mon	+30°C	+18°C	—	2-4 m/s, W	0 mm	48%
14Tue	+29°C	+18°C	—	2 m/s, WSW	0 mm	49%
15Wed	+28°C	+19°C	—	2 m/s, W	0 mm	51%
16Thu	+25°C	+19°C	—	3 m/s, SW	4.2 mm	72%
17Fri	+20°C	+18°C	—	2-3 m/s, NW	3.9 mm	93%
18Sat	+22°C	+15°C	—	3-4 m/s, ENE	0 mm	86%
19Sun	+21°C	+16°C	—	2-3 m/s, ENE	4.2 mm	88%
20Mon	+20°C	+15°C	—	4-5 m/s, E	0.5 mm	86%
21Tue	+22°C	+13°C	—	4-5 m/s, NE	0 mm	65%
22Wed	+21°C	+13°C	—	3 m/s, ENE	0 mm	62%
23Thu	+21°C	+13°C	—	2-3 m/s, W	0 mm	64%
24Fri	+21°C	+13°C	—	2 m/s, WSW	0 mm	77%
25Sat	+22°C	+14°C	—	2 m/s, W	0 mm	78%
26Sun	+23°C	+16°C	—	2 m/s, WSW	1.3 mm	79%
27Mon	+23°C	+17°C	—	1-2 m/s, W	0.2 mm	79%
28Tue	+27°C	+17°C	—	2-3 m/s, ENE	0 mm	71%
29Wed	+25°C	+18°C	—	2-3 m/s, NE	0 mm	63%
30Thu	+19°C	+15°C	—	6 m/s, NE	0 mm	74%

Weather highs and lows in Trieste for september

Warmest day: 13 september, +30°C
Coldest night: 21 september, +13°C
Max precipitation: 16 september, 4.2 mm
Warmest water: —
Coldest water: —

Climate in Trieste in september

Year: 2021
Average daytime temperature: +25°C
Average nighttime temperature: +16°C
Water temperature: —
Precipitation (month): 14.3 mm
Days with precipitation: 4
Humidity: 64%
Wind: 3 m/s

Daily air temperature for the month

Day Night

Tap a date to open detailed weather for that day

September	Day	Night	Sea t°	Wind	Precip	Humidity
1Tue	+21°C	+16°C	—	3-5 m/s, WNW	2.4 mm	75%
2Wed	+24°C	+16°C	—	2-3 m/s, NE	0.1 mm	68%
3Thu	+25°C	+17°C	—	3-4 m/s, NNE	0 mm	66%
4Fri	+27°C	+17°C	—	2-3 m/s, SW	0 mm	62%
5Sat	+26°C	+18°C	—	2 m/s, W	0 mm	66%
6Sun	+27°C	+19°C	—	2 m/s, S	0.1 mm	68%
7Mon	+25°C	+18°C	—	4-5 m/s, ENE	0 mm	68%
8Tue	+25°C	+18°C	—	5-6 m/s, NE	0 mm	60%
9Wed	+27°C	+17°C	—	2-4 m/s, SSW	0 mm	63%
10Thu	+28°C	+18°C	—	2-3 m/s, NNE	0 mm	64%
11Fri	+27°C	+20°C	—	4-5 m/s, ENE	0 mm	64%
12Sat	+29°C	+20°C	—	4 m/s, WSW	0 mm	62%
13Sun	+30°C	+20°C	—	3-4 m/s, ENE	0 mm	60%
14Mon	+29°C	+21°C	—	4-5 m/s, ENE	0 mm	60%
15Tue	+29°C	+21°C	—	4-5 m/s, ENE	0 mm	56%
16Wed	+30°C	+20°C	—	2-4 m/s, WSW	0 mm	60%
17Thu	+28°C	+20°C	—	4-5 m/s, NE	0 mm	58%
18Fri	+25°C	+18°C	—	6-8 m/s, ENE	0 mm	58%
19Sat	+24°C	+16°C	—	5-6 m/s, ENE	0 mm	54%
20Sun	+25°C	+16°C	—	2-4 m/s, SSW	0 mm	50%
21Mon	+25°C	+17°C	—	2 m/s, WSW	4.7 mm	66%
22Tue	+23°C	+17°C	—	1-2 m/s, SSW	11.4 mm	74%
23Wed	+21°C	+18°C	—	2-3 m/s, S	3.1 mm	84%
24Thu	+22°C	+17°C	—	2 m/s, SSW	0.6 mm	82%
25Fri	+22°C	+15°C	—	4-5 m/s, SSW	21.6 mm	82%
26Sat	+15°C	+11°C	—	3-5 m/s, S	2.5 mm	74%
27Sun	+18°C	+10°C	—	2-4 m/s, NNE	0.7 mm	64%
28Mon	+13°C	+12°C	—	4-8 m/s, SSW	8.2 mm	89%
29Tue	+18°C	+10°C	—	2-3 m/s, S	0 mm	73%
30Wed	+19°C	+13°C	—	2 m/s, W	0 mm	68%

Weather highs and lows in Trieste for september

Warmest day: 13 september, +30°C
Coldest night: 27 september, +10°C
Max precipitation: 25 september, 21.6 mm
Warmest water: —
Coldest water: —

Climate in Trieste in september

Year: 2020
Average daytime temperature: +24°C
Average nighttime temperature: +17°C
Water temperature: —
Precipitation (month): 55.4 mm
Days with precipitation: 7
Humidity: 67%
Wind: 3 m/s

Weather in Trieste in september by year

Year	Day	Night	Precipitation	Days with precipitation	Water
2025	+23°C	+15°C	21.2 mm	7	—
2024	+23°C	+15°C	30.9 mm	6	—
2023	+26°C	+16°C	27.1 mm	5	—
2022	+22°C	+15°C	42.4 mm	11	—
2021	+25°C	+16°C	14.3 mm	4	—
2020	+24°C	+17°C	55.4 mm	7	—

Comparison september in Trieste with other months

Month	Day	Night	Days with precipitation	Sunny days
January	+9°C	+3°C	6	13
February	+10°C	+5°C	4	10
March	+13°C	+6°C	5	13
April	+16°C	+8°C	6	10
May	+20°C	+12°C	7	9
June	+26°C	+17°C	4	15
July	+29°C	+19°C	5	17
August	+29°C	+20°C	5	17
September	+24°C	+16°C	7	17
October	+19°C	+12°C	6	14
November	+13°C	+8°C	6	10
December	+9°C	+5°C	6	10