Early September 1 September
81°F
Typical afternoon high
26% historical wet-day frequency
Italy · Beach
Friuli Venezia Giulia
in September.
Is September a good time?
Warm days.
Fewer overnight stays than August.
September averages 76°F afternoons and 74°F seas, with about 10 rain days. Later September is typically cooler.
- Afternoons
- 76°F
- Sea
- 74°F
- Visitor demand
- 53%of August peak
Historical Friuli-Venezia Giulia regional averages, not a forecast or a measure of queues. Overnight demand compares average stays per day. Covers Trieste; conditions vary within the region.
Overall match
7.1/10 · scores & prioritiesPlanning to sightsee in Trieste? The weather score rates beach conditions. Sightseeing rates very good (8.6/10).
What matters most?
Weather 50% · Crowds 30% · Cost 20%
#2 of 12 months here · Balanced mix
Weather7.7/10Very good
CrowdsModerate seasonvs its own year; overnight stays do not measure queuesFor its size, busier than most of Europe this month
CostPriceyfor Europe; Italy-wide price level
Overall combines weather, overnight demand and cost. It does not include sea temperature.
Plan your September
What to expect.
What should I pack?
Afternoons around 76°F (24°C): T-shirt weather. Bring rain gear: about 10 days with at least 1 mm of rain. About 13 hours of daylight.
Can I swim in September?
The sea averages 74°F. Our swimming guide: warm for swimming. Your comfort will vary. This is open water near the coast, not a beach-specific reading.
Monthly coastal averages from NOAA, 2011–2025. Sea temperature is separate from the weather and Overall scores.
A typical day: temperatures & daylightAfternoons, nights, sea temperature & daylight Show detailsHide details
About 13 hours of daylight.
The sun rises about 06:44 and sets about 19:22 (local time, mid-month). Afternoons reach about 76°F (24°C). Expect rain on about 10 days in a typical September.
Typical afternoon
76°F (24°C)
average daily high, 15 recent Septembers
Night low
—
not shown here: our correction of the model data isn't accurate enough for night lows in this region
Sea
74°F (24°C)
warm; open water near the coast, NOAA satellite record 2011–2025
Daylight
12h 38m
on the 15th, computed from latitude
Early, middle or late?
Early or late September?
Early September is typically warmer. The afternoon high averages 81°F on the 1st, versus 70°F on the 30th. Historical wet-day frequency rises from 26% to 35% between those dates.
Mid September 15 September
76°F
Typical afternoon high
30% historical wet-day frequency
Late September 30 September
70°F
Typical afternoon high
35% historical wet-day frequency
Historical daily averages from 2011–2025, smoothed over two weeks. A seasonal pattern, not a forecast. This does not establish which week has the lowest prices or fewest visitors.
Daily calendar & holiday datesSeptember 2027 · historical weather & dated holidays Show calendarHide calendar
September 2027 calendar
Weather shows historical patterns, not a forecast. Holidays and events use the dates shown for 2027.
| Mon | Tue | Wed | Thu | Fri | Sat | Sun |
|---|---|---|---|---|---|---|
| 181° | 281° | 381° | 480° | 580° | ||
| 680° | 779° | 879° | 979° | 1079° | 1178° | 1278° |
| 1377° | 1477° | 1576° | 1676° | 1775° | 1875° | 1974° |
| 2074° | 2174° | 2274° | 2373° | 2473° | 2572° | 2672° |
| 2772° | 2871° | 2971° | 3070° |
Afternoon high rain likely (25%+) local school holidays public holiday event
School-holiday dates for September 2027 aren't available in our data yet. A day without a school marker doesn't mean schools are open.
Afternoons cool from about 80°F (27°C) in the first week to 72°F (22°C) in the last. The chance of a wet day runs 26–35%.
Crowds and cost
Visitor season
Will it be busy?
Moderate season. September averages 53% of August's overnight stays per day. Fewer overnight stays than August.
Overnight stays across Friuli-Venezia Giulia do not measure queues, day visitors or congestion at individual sights. For its size, busier than most of Europe this month.
Hotel price season
Will it be cheaper?
About usual. The regional index has no room-rate baseline in euros.
Fewer overnight stays do not automatically mean cheaper rooms. Check actual quotes for your trip.
Italy as a whole
Above EU average
2024 restaurants and hotels price level: 107 where the EU average is 100. A relative index, not a room rate.
The hotel-season index is regional (ISTAT, NIC consumer price index for accommodation services (ECOICOP 112), by region); the country price level is national. Neither is a room quote.
Year-to-year variation
How much does September vary?
Across the recorded years
In the 15 years from 2011 to 2025, the month's afternoons averaged between 70°F (21°C) and 80°F (27°C); in 11 of them they were within 3°F (1.5°C) of the typical 76°F (24°C). Rain days ranged from 4 to 17; half the years had 6–12.
Rain days in each September
Rain days
10
at least 1 mm, typical year; about 13 in a wet year
Mostly sunny days
7 of 30
cloud cover under 30%
Years with a 95°F+ day
0 of 15
no September in the last 15 years had a day at or above 95°F (35°C)
Good weather days
20 of 30
rated very good or better
See every recorded SeptemberHistorical monthly averages, year by year Show detailsHide details
| Year | Afternoon high | Rain days |
|---|---|---|
| 2011 | 80°F | 5 |
| 2012 | 76°F | 11 |
| 2013 | 74°F | 10 |
| 2014 | 74°F | 10 |
| 2015 | 74°F | 10 |
| 2016 | 79°F | 6 |
| 2017 | 70°F | 17 |
| 2018 | 78°F | 6 |
| 2019 | 76°F | 9 |
| 2020 | 77°F | 9 |
| 2021 | 78°F | 4 |
| 2022 | 74°F | 13 |
| 2023 | 80°F | 6 |
| 2024 | 75°F | 12 |
| 2025 | 75°F | 12 |
Checked against official climate averages for Trieste. How we check
Compare dates
August, September
or October?
| Typical conditions | Aug | Sep | Oct |
|---|---|---|---|
| Afternoons | 85°F | 76°F | 66°F |
| Sea | 79°F | 74°F | 68°F |
| Rain days | 7 | 10 | 11 |
| Overnight demand | 100% | 53% | 23% |
August: Warmer afternoons, warmer sea and fewer rain days than September. More overnight demand. August guide →
October: Cooler afternoons and cooler sea than September. Less overnight demand. October guide →
Overnight demand measures accommodation stays, not queues. Sea temperatures are monthly coastal averages.
Compare any of the 12 monthsChoose another month and compare it with September Show comparisonHide comparison
Yellow marks the top three months on the Balanced mix. September stays as your reference.
July to August have a Weather score at least 1.0 point higher than September, but more overnight stays.
Your comparison
September or August?
Overnight stays are 100% of the busiest month.
Historical regional hotel-price season: well above usual. There is no room-rate baseline in euros.
Read the August guide →| Typical conditions | September | August |
|---|---|---|
| Afternoons | 76°F | 85°F |
| Nights | — | — |
| Sea | 74°F | 79°F |
| Rain days | 10 | 7 |
| Visitor season | Moderate season | Peak season |
| Overall / 10 | 7.1 | 6.5 |
| Month rank | #2 | #7 |
Every month, in detail Show detailsHide details
| Month | Overall | Rank | High | Low | Sea | Rain days | Weather | Visitor season |
|---|---|---|---|---|---|---|---|---|
| January | 3.3 | #12 | 48°F | — | 52°F | 8 | 1.3 | Low season |
| February | 3.5 | #11 | 51°F | — | 50°F | 7 | 1.5 | Low season |
| March | 5.5 | #8 | 58°F | — | 51°F | 7 | 3.5 | Low season |
| April | 6.7 | #6 | 65°F | — | 57°F | 8 | 5.5 | Low season |
| May | 6.8 | #4 | 72°F | — | 64°F | 11 | 6.4 | Moderate season |
| June | 7.3 | #1 | 81°F | — | 74°F | 8 | 8.6 | Busy season |
| July | 6.8 | #3 | 85°F | — | 79°F | 7 | 8.9 | Peak season |
| August | 6.5 | #7 | 85°F | — | 79°F | 7 | 8.7 | Peak season |
| September | 7.1 | #2 | 76°F | — | 74°F | 10 | 7.7 | Moderate season |
| October | 6.8 | #5 | 66°F | — | 68°F | 11 | 5.6 | Low season |
| November | 4.6 | #9 | 57°F | — | 62°F | 10 | 2.6 | Low season |
| December | 3.8 | #10 | 50°F | — | 56°F | 7 | 1.8 | Low season |
Near here
Nearby places in September
Nearby regions, nearest first. Distances are centre to centre, as the crow flies; they are not road distances or journey times.
Ljubljana, Lake Bled & western Sloveniaabout 50 miles
Balanced Overall 7.7 · Very good weather, 73°F (23°C) · Moderate season · Cost moderate
CarinthiaAustria · about 60 miles
Balanced Overall 7.4 · Very good weather, 69°F (21°C) · Moderate season · Cost pricey
Venice & the VenetoItaly · about 70 miles
Balanced Overall 7.2 · Very good weather, 77°F (25°C) · Busy season · Cost pricey
Milan, Lake Como & LombardyItaly · about 160 miles
Balanced Overall 7.2 · Excellent weather, 76°F (25°C) · Busy season · Cost pricey
Croatia's coastSplit, Dubrovnik · Croatia · about 180 miles
Balanced Overall 7.6 · Very good weather, 77°F (25°C) · Moderate season · Cost pricey
Elsewhere in Europe
Better September weather than Friuli Venezia Giulia
Friuli Venezia Giulia's weather ranks 48 of 77 beach regions this month. These beach regions outside Italy have clearly better weather on your dates, nearest first, each compared with Friuli Venezia Giulia.
CorsicaFrance · about 340 miles
Excellent weather (9.8): 3°F warmer afternoons, 6 fewer rain days, pricier
French Riviera & ProvenceFrance · about 370 miles
Excellent weather (9.5): 3°F warmer afternoons, 6 fewer rain days
Languedoc-RoussillonFrance · about 510 miles
Excellent weather (9.0): 3°F warmer afternoons, 5 fewer rain days, quieter for its season (moderate season)
Albanian Riviera & the southAlbania · about 530 miles
Excellent weather (9.4): 6°F warmer afternoons, 5 fewer rain days, cheaper
Thessaloniki & HalkidikiGreece · about 620 miles
Excellent weather (9.9): 7°F warmer afternoons, 6 fewer rain days, cheaper
How we knowSources, regional scope & scoring method Show detailsHide details
It's moderate season, 53% of the busiest month and 30% above its average month. That means about 38,000 overnight visitors on a typical September night across the region, 34% of them from Italy itself. Rentals booked through Airbnb, Booking, Expedia and Tripadvisor add up to 6,000 more: 16 for every 100 counted above. Some are the same properties counted twice.
| Climate suitability (HCI:Beach, 0–100) | 74 |
| How our weather was checked | Official climate averages for Trieste from the national weather service, every month: afternoon highs typically within 1°F (0.5°C), night lows off by more than 4°F (2°C), so not shown. |
| Tourist nights per 1,000 residents per day | 31 |
| Busiest month here | August · 59 |
| Visitors as share of people present | 3.1% |
| Rank among Europe's regions this month | 80th percentile |
| Domestic share of nights | 34% |
| Platform rental nights per 100 counted nights | 16 |
| Visitor share if every platform night were extra | 3.5% |
| Regional hotel-price season | About usual (+4% vs this region's average month). Historical index from ISTAT, NIC consumer price index for accommodation services (ECOICOP 112), by region; no euro room-rate baseline. |
| Population used | 1.2 million |
| Statistical region | ITH4 · Friuli-Venezia Giulia |
Crowds: Eurostat nights spent at tourist accommodation, by month and NUTS 2 region, 2024–2025 average. Overnight visitors per night is the month's nights divided by its days; the per-1,000 figure is Eurostat's, against each year's population. Platform rentals: Eurostat nights booked via Airbnb, Booking, Expedia and Tripadvisor, 2024–2025 average, shown separately because some properties are in both counts. Weather: Holiday Climate Index computed from ERA5 reanalysis with daily highs, night lows and rain days corrected from open national weather-service station records, 2011–2025, population-weighted to the region; day-by-day figures are the same data averaged by date. Heat and rain odds are counted across those years. Sunrise and sunset: NOAA solar equations, local time. Prices: Eurostat price level index and HICP, national; the first figure is regional (ISTAT, NIC consumer price index for accommodation services (ECOICOP 112), by region). Full method · this region's data.