Triest Weather in September

During September, Triest experiences high daytime temperatures of 23°C (73°F) and cooler nights around 15°C (59°F). Expect quite a bit of rainfall. Around 169 mm (6.7 in) is typical.

Rainfall in Triest in September

The climate data from previous years indicates about 11 days of rain, averaging 169 mm (6.7 in) for the month. When it rains this month, it tends to come down fairly heavily. Showers can be substantial even if they don't last all day.

Temperature in Triest in September

If you're visiting Triest in September, expect highs of 23°C (73°F) and overnight lows around 15°C (59°F). Conditions stay fairly consistent through the month, making it easier to plan what to wear. Nights drop to around 15°C (59°F), which is noticeably cooler than the daytime. A light jacket for the evening is a sensible addition, and the cool nights tend to make sleeping comfortable.

Sunshine in Triest in September

Expect sunny days throughout the month, with an estimated 211 hours of sunshine. This makes it a pleasant time to visit Triest.

Average water temperature in September

The water temperature is 22°C (72°F), which most people find very comfortable. A good month for swimming and water sports.

If your ideal day consists of dry skies and pleasant temperatures, July typically offers the best circumstances for Triest.

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• January
• February
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• May
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• November
• December

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

Triest 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%  

What to Wear in Triest in September

For Triest in September, you'll want flexible clothing. It's wise to pack cotton shirts, comfortable shorts, and a pair of jeans for cooler evenings. A light sweater or jacket is useful for air-conditioned spaces (like buses) or unexpected cool moments. Also bring a poncho, it will rain a lot! Waterproof everything you can. With water temperatures around 22°C (72°F), swimming conditions are excellent. Pack your swimsuit, goggles, and maybe some water shoes. Don't forget sun protection, sunglasses, sunscreen, and a hat. These are all good ideas with this much sunshine.

What To Do in Triest 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 Triest's climate page.

More climate data for Triest

Temperature Rainfall Sunshine Humidity Water Temp

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