Trieste Weather in September

September in Trieste typically sees daytime highs of 23°C (73°F) and nighttime lows of 15°C (59°F). Rainfall is also possible this month, so it's worth packing an umbrella.

Rainfall in Trieste in September

Typically around 11 days of rainfall are expected, averaging 169 mm (6.7 in) for the month. The rain this month tends to fall in heavier spells rather than light drizzle. When it rains, showers can be significant.

Temperature in Trieste in September

September in Trieste brings high temperatures, with highs of 23°C (73°F) and nights around 15°C (59°F). Overall, the month follows a fairly predictable daily temperature pattern. With overnight lows of 15°C (59°F), evenings can feel noticeably cooler than the daytime. An extra layer is a good idea, though the cool air makes for a good night's sleep.

Sunshine in Trieste in September

Enjoy a sunny month with about 211 hours of sunshine, the clear skies make Trieste even more beautiful.

Average water temperature in September

At 22°C (72°F), the water is warm and comfortable for swimming. Most people find this temperature ideal for spending longer periods in the water.

Our weather planner can help you find worldwide destinations with pleasant weather during this period. July typically offers the best weather for Trieste.

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For a detailed overview over the year and the best time to visit Italy, check out our Trieste's climate page.

Trieste Temperature in September

Min Temperature 15°C (59°F)  

Max Temperature 23°C (73°F)  

Water Temperature 22°C (72°F) *  

Chance of Rain 38%  

Precipitation 169 mm (6.7 in)  

Rainy days 11 days  

Humidity 67% *  

Sunshine 211 hours *  

Percentage Sunshine 54% *  

* Data from: Triest, Italy (2 KM, 1 Miles).

What to Wear in Trieste in September

Pleasant temperatures in September mean you can pack light but flexibel pieces. Think cotton t-shirts, comfortable walking shorts, and one warmer layer for evenings. A light sweater or denim jacket works well. Heavy rain is guaranteed, please bring a good poncho and waterproof everything! Expect water temperatures of around 22°C (72°F), which is ideal for taking a refreshing dip. Bring swimwear and consider packing a towel for drying off. And with plenty of sunshine hours, don’t forget sunglasses, sunscreen, and maybe a sun hat.

What To Do in Trieste in September

We rated the following activities from 1 (least suitable) to 10 (best) to do.

Swimming

7/10

Camping

6/10

Select a Month

Check the conditions for any month of the year.

• January
• February
• March
• April

• May
• June
• July
• August

• September
• October
• November
• December

For a detailed overview over the year and the best time to visit Italy, check out our Trieste's climate page.

More climate data for Trieste

Temperature Rainfall Sunshine Humidity Water Temp

See the full Trieste climate overview or explore weather in Italy.