The month in detail
What to expect in September
Autumn in Trieste is often underrated: 75°F, golden light and declining crowds. An interesting window. Expect rain on 26% of days — a light raincoat in the bag is recommended. A good balance between weather and crowds, even if July (8.9/10) remains theoretically better.
September ranks 4 out of 12 months in Trieste. Compared to August: −9°F daytime, 5 pts more rainy days, −2.1h of sun per day.
This month's conditions
What it's like in September
UV index
4 · moderate
protect during midday hours
Feels like
comfortable
14°
Sea
23°C
pleasant for swimming
Daylight
12.3h of daylight
Air quality
good
AQI 30
Compare
Is September the right month?
The best month in Trieste is July (8.9/10), 0.9 pt higher than September.
Book
Plan your trip
Hotels at their lowest outside peak season, highest on comfortable months. Shoulder seasons offer a good price/climate compromise.
Stay
Hotels & rentals · Trieste
Expedia →
Activities
Tours, tickets, experiences
See ↓
Flights
Multi-airline comparator
Kiwi →
🎟️ Activities & tours · Trieste
GetYourGuide selection · free cancellation
Practical info
What you need to know before you go
Three angles: the country (language, currency, safety, budget), the year-round climate, and the specifics of a beach trip.
Country · Italy
🗣️LanguageItalian
💶CurrencyEuro (€)
🚗DrivingRight-hand
🛡️Safety ⓘVery safe · 1/5
💰Cost of living ⓘModerate · 3/5
🌡️ Climate
🌍Climate typeTemperate oceanic
📈Climate trend ⓘStable
🔥Hottest monthJuly · 84°F
❄️Coolest monthJanuary · 48°F
🌧️Rainiest month ⓘNovember · 35%
🏖️ Beach trip
📅Peak seasonJuin → Sept
🏖️Swell (Sept–Mar) ⓘModérée
🛂VisaSchengen · 90 days
Explore
Other destinations in September
If September doesn't convince you for this destination, compare with others.
Location
Where is Trieste ?
Global position + regional geographic context.
🌍 World
🔍 Geographic context
ItalyTemperate oceanic climate with a 8.9 → 4.0 gap between best and worst month. 10 years of ERA5 data to choose by project.
45.65°N · 13.78°E
Questions
Frequently asked questions
What is the best time to visit Trieste?
July is the best month with 84°F highs, 68°F lows, 9.6h of sunshine and 19.0% rainy days. The months of July & August offer comparable conditions.
How many hours of sunshine does Trieste get in July?
Trieste averages 9.6 sunshine hours per day in July. It is the sunniest month with a climate score of 8.5/10.
What is the rainiest month in Trieste?
January is the most unfavourable month with January has the lowest climate score of the year and the lowest climate score of the year.
What are the temperatures at night in Trieste in July?
In July, overnight lows reach 68°F, while afternoon highs average 84°F.
Is Trieste good in winter?
In winter (December-February), Trieste scores 4.0/10 on average — Difficult period — prefer the peak season.. The best month overall remains July with a score of 8.5/10.
When should you avoid Trieste?
January is the most difficult month to visit Trieste, with January has the lowest climate score of the year. Climate conditions are at their lowest of the year during this period.
Can you swim in Trieste in September?
In September, the sea averages 74°F in Trieste: pleasant for swimming. Swimming is pleasant without a wetsuit.
Do you need sun protection in Trieste in September?
The average UV index reaches 4 in September in Trieste (moderate), with about 12.3h of daylight. Protect during midday hours.