September–October
Wk 39–41
The quietest stretch among this region's best weather weeks: crowd level around 19 out of 100, weather comfort near 62.
- Crowd level
- 9–36
- Comfort
- 57–66
Croatia · Istrien
Istria: an amphitheatre in Pula, a basilica in Poreč, truffles around Motovun
Rome took the peninsula by 177 BC and made it, together with Venetia, the tenth region of Italy; in the interior Venice protected an oak wood for its shipbuilding. Today several languages stand side by side on the peninsula.
Busiest week
AugustCrowd level 100
Wk 32 · 6,125,245 overnight stays
Quietest weeks
JanuaryCrowd level 0
Wk 1–3 · measured against the region's own year, not against other regions
Sweet spot
September–OctoberCrowd level 9–36
Wk 39–41 · quietest while the weather still holds
Warmest month
23 °CComfort 83
July · around 55 mm of rain in the month
The overnight-stay figures come from a statistical area that this destination shares with Dalmatien, Dubrovnik and Kvarner Bucht. They cover the whole area, not Istrien on its own.
Istrien in brief
Istria is the largest peninsula of the northern Adriatic at some 3,500 square kilometres, running from the Gulf of Trieste to the Kvarner Bay. Three states have a share in it, and the largest share of its area belongs to Croatia. From Roman times Pula keeps its amphitheatre, temple of Augustus and Arch of the Sergii, and from the sixth century Poreč keeps the Euphrasian Basilica, a UNESCO World Heritage Site. Inland lie vineyards and the truffle country around Motovun.
When is Istrien busy, when is it quiet?
Click a week. The panel on the right explains why it is busy or quiet.
Weather profile
Weather comfort is an absolute scale (0 = poor, 100 = ideal) and a second axis next to the season-relative crowd level.
JanuaryØ 0
FebruaryØ 1
MarchØ 2
AprilØ 9
MayØ 20
JuneØ 49
JulyØ 90
AugustØ 94
SeptemberØ 40
OctoberØ 10
NovemberØ 2
DecemberØ 1
Colour = season-relative crowd levelBar = weather comfort (Sun & warmth), absolute 0–100
Why this week?
September · Wk 39
Crowd level36/100 · moderate
quietbusy
Weather comfort28/100 · Sun & warmth
+36 % versus the region's annual average.
- Contributing months
- September (90 %) · October (10 %)
- Overnight stays/week
- 2,254,182
- Main source markets
- Germany (27 %) · Croatia (12 %) · Slovenia (10 %) · 90% of guests modelled
- Region range
- 71,451–6,125,245 (avg 1,655,941)
- Base years
- 2022, 2023, 2024, 2025 (excluding 2020, 2021)
v1: Crowd-Score aus der Eurostat-Basisschicht (Übernachtungen), moduliert vom Schulferien-Druck der Quellmärkte, region-spezifisch gewichtet mit dem Quellland-Mix. Season-relativ zur Region. Event-Schichten folgen.
Plan your trip
Pre-filled with the next date in week 39.
DestinationIstrien
Travel datesPick a week in the calendar
FlightSearch flights (opens in a new tab)
StayFind stays (opens in a new tab)
ActivityExplore activities (opens in a new tab)Ad · commission link
Photos: Johny Goerend · reisetopia · Dino Reichmuth on Unsplash
The travel year in Istrien, month by month
The year as a table to read and to cite: crowd level for every month, plus weather comfort and temperature from the climate normals.
| Month | Crowd level0–100, season-relative | Weather comfort0–100, profile “mild” | Avg temperature |
|---|---|---|---|
| January | 0 | 12 | 1 °C |
| February | 1 | 16 | 4 °C |
| March | 2 | 27 | 7 °C |
| April | 9 | 45 | 11 °C |
| May | 20 | 59 | 15 °C |
| June | 49 | 80 | 21 °C |
| July | 90 | 83 | 23 °C |
| August | 94 | 82 | 23 °C |
| September | 40 | 71 | 17 °C |
| October | 10 | 54 | 13 °C |
| November | 2 | 27 | 7 °C |
| December | 1 | 14 | 3 °C |
The crowd level is season-relative: 100 is the annual peak of Istrien itself, not the busiest destination in Europe. The figures say when it is quiet here — not where it is quieter than elsewhere.
Weather comfort 0–100 from the climate normals, profile “mild” – the same profile as the recommendation above, not the selection in the calendar. A “–” means the data for that month is missing.
Index 2.0 · As of 25/08/2026
The windows worth catching
Three windows from the model: first whether the weather suits the region, then how busy it gets.
May
Wk 20–22
A second option, also with usable weather: crowd level around 22, weather comfort near 64.
- Crowd level
- 18–30
- Comfort
- 57–70
August
Wk 31–33
The region's peak: crowd level around 99 out of 100. Only if the dates are fixed.
- Crowd level
- 97–100
- Comfort
- 82–83
Istrien compared with Europe
How full the accommodation is here, measured against Europe – on the only measure on which two travel regions can be compared.
- Bed occupancy in Istrien
- 21.8
- European median
- 23.1
per cent of bed places, annual mean
per cent of bed places, annual mean
Furthest from the median: January, at <0.1× the value. Closest to the median: September, at 1.2× the value.
Mean across 12 months, weighted by their weeks. This occupancy compares travel regions with one another. The crowding in the table above compares Istrien with itself. The two measures are never combined.
Climate through the year
Average temperature with day/night range and precipitation across the twelve months.
- Avg temperature
- Day/night range
- Precipitation
| Month | Avg temperature (°C) | Day avg (°C) | Night avg (°C) | Precipitation (mm) |
|---|---|---|---|---|
| Jan | 0 | 1 | -1 | 117 |
| Feb | 2 | 4 | 1 | 128 |
| Mar | 5 | 7 | 3 | 127 |
| Apr | 8 | 11 | 6 | 87 |
| May | 12 | 15 | 10 | 131 |
| Jun | 18 | 21 | 16 | 67 |
| Jul | 20 | 23 | 18 | 55 |
| Aug | 20 | 23 | 17 | 68 |
| Sep | 15 | 17 | 13 | 132 |
| Oct | 11 | 13 | 9 | 131 |
| Nov | 6 | 7 | 5 | 195 |
| Dec | 2 | 3 | 1 | 143 |
The band shows mean daytime to nighttime temperature. Precipitation shown as monthly total (mm). Typical monthly value (climate normal), not a forecast.
How sunny?
How much sun a typical day delivers, month by month, expressed as hours of full midday sun.
Sunny
≈ 4.0 h of full midday sun per day, annual average
Jun
Sunniest month
| Month | ≈ h of full midday sun per day |
|---|---|
| Jan | 1.6 |
| Feb | 2.3 |
| Mar | 3.9 |
| Apr | 5.2 |
| May | 5.7 |
| Jun | 6.7 |
| Jul | 6.7 |
| Aug | 5.8 |
| Sep | 4.2 |
| Oct | 2.9 |
| Nov | 1.6 |
| Dec | 1.3 |
Basis: mean daily solar irradiance in kWh/m²/day; 1 kWh/m² is roughly one hour of full midday sun (1,000 W/m²). Not the same as measured sunshine duration. Typical monthly value (climate normal), not a forecast.
Directly reachable from
Destination airports of Istrien and every European departure airport with a direct connection to them.
Destination airports
Select a destination airport to see the direct departure airports.
“Directly reachable” means a direct connection exists according to our sources. We do not show a live timetable. Availability and flight days can vary by season and airline.
Ski areas in Istrien
Mapped ski areas in this region with slope kilometres, lifts and elevation, plus the long-term snow average from our climate data.
- Ski areas
- 2
- Slopes in total
- 11 km
- Lifts
- 9
- Highest point
- 1,354 m
On a long-term average, February sees the most snow: 6 cm mean snow depth across the region.
| Ski area | Slopes | Lifts | Elevation |
|---|---|---|---|
| Platak | 8.99 km | 7 | 1,085–1,354 m270 m vertical drop |
| Rudnik Tršće | 1.6 km | 2 | 830–1,019 m189 m vertical drop |
Slope, lift and elevation figures come from open mapping and are complete to varying degrees. “Not available” means not mapped, not “does not exist”. Opening hours and season are not included. Snow figures are long-term averages for the whole region, not snow depth on the mountain and not a forecast.
Istrien in detail
Location and shape
Istria is the largest peninsula of the northern Adriatic and measures some 3,500 square kilometres; it extends between the Gulf of Trieste and the Kvarner Bay and reaches the Učka in the east. Its highest point is the Vojak at 1,401 metres in the Učka range; the coast is deeply indented over 537 kilometres, and inlets such as the Lim Channel reach inland in fjord-like fashion. Three states have a share in the peninsula: the largest share of its area belongs to Croatia, a smaller northern part to Slovenia, and the area around Muggia to Italy.
Karst, caves and a drained lake
Limestone, dolomite, sandstone and marl shape the ground; more than 2,000 caves have been recorded. Lake Čepić near Plomin was the peninsula's single inland lake; it was drained in 1932 through a tunnel more than 4.5 kilometres long. On the west coast the Lim Channel runs some ten kilometres inland, a narrow inlet between Vrsar and Rovinj whose brackish water carries fish, mussel and oyster farms. Around 4,000 vascular plants grow on the peninsula, among them 146 species of orchid; three of these are endemic.
Histri, Romans, World Heritage
Nesactium near Vizače was the capital of the Histri and held out against Rome until 177 BC; remains of a gate, of the fortifications and a necropolis with more than 250 graves survive. Older still is Monkodonja near Rovinj, a fortified hill settlement with cyclopean masonry that stood between 1850/1750 and 1500/1450 BC and whose culture shows influences of the Mycenaean culture; about a kilometre to the south-east lies the tumulus necropolis of Mušego. After the conquest Histria formed the tenth region of Italy together with Venetia, and all free inhabitants became Roman citizens; from that period Pula keeps its amphitheatre, temple of Augustus and Arch of the Sergii. The sixth-century Euphrasian Basilica in Poreč is a UNESCO World Heritage Site, and Motovun stands on the tentative list.
Stone huts, frescoes, voices
In the little church of St Mary at Beram a dance of death runs across the wall. Kažuns stand out in the fields, shelters built of stone; dry stone walling is on the UNESCO list of intangible cultural heritage, and north of Vodnjan the Park kažuna was laid out between 2009 and 2016. On the same list stands the two-part singing in the Istrian scale. Around 60 per cent of Istrians speak Croatian, more than 20 per cent Slovene and more than 10 per cent Italian; Istro-Romanian is added in the north-east and Istriot in the south-west, the two together with perhaps 2,000 speakers, and the Istro-Venetian of the west coast has counted as national intangible cultural heritage of Croatia since 2021.
Towns, woodland, oil and wine
At the 2021 census Pula was the largest town with 58,594 inhabitants, followed by Koper, Poreč, Rovinj, Umag and Labin; Hum, with around 30 inhabitants, counts as the smallest town in the world. In the Mirna valley stands what remains of the Montona forest, which the Republic of Venice protected for as long as western Istria was under its rule, until 1797; its oak and elm went into Venetian shipbuilding. From the interior come Malvasia Istriana and Teran, muscat around Momjan, and truffles from the country around Motovun; 23 olive varieties grow on the peninsula, whose stock has risen from about 900,000 trees in 2010 to an estimated 1.6 million. Off the west coast near Fažana lies the Brijuni National Park, and at the southern tip the Kap Kamenjak nature reserve; in Opatija the Villa Angiolina became the first hotel in 1844, and in 1889 the place was declared Istria's first seaside resort.
How it differs from the other Adriatic destinations
The four Croatian destinations lie on the same coast but cut it differently: Istria is a peninsula of some 3,500 square kilometres, the Kvarner a sea area of four stretches of water with its islands, Dalmatia a coastal landscape with around 942 islands, islets, cliffs and rocks off 1,200 kilometres of shore, Dubrovnik a city that counted 41,562 inhabitants with all its districts in 2021. Eastwards Istria borders on the Kvarner Bay: the Vojak in the Učka range is Istria's highest point and at the same time the viewpoint over the bay. Opatija belongs to both pictures too, as a place on the shore of the bay and as the place where the first hotel opened in 1844 and which was declared Istria's first seaside resort in 1889. Roman work stands in both of the larger landscapes: in Pula the amphitheatre, the temple of Augustus and the Arch of the Sergii, in Split the Palace of Diocletian, which grew out of the surroundings of the provincial capital Salona. Istria carries several languages side by side, among them Istriot and Istro-Romanian; in Dubrovnik two names stand side by side, the Slavic Dubrovnik after dubrava, the oak grove, and the Romance Ragusa after the island of the first settlement.
Frequently asked questions about the best time to visit Istrien
Short answers on timing, weather and getting there, all from the data on this page.
When is the best time to visit Istrien?
- The best time to visit Istrien is September–October (Wk 39–41): it is the quietest stretch among the region's best weather weeks – crowd level around 19 out of 100, weather comfort about 62 out of 100.
When is Istrien quietest?
- January (Wk 1–3) is the quietest time in Istrien. Crowd levels there sit at 0 out of 100, the lowest across the year.
When is Istrien busiest?
- Istrien is busiest in August (Wk 32) with around 6,125,245 overnight stays in the peak week.
What is the weather like in Istrien and when is it warmest?
- It is warmest in Istrien in July with an average of 23 °C and around 55 mm of rain in the month.
When is there the most snow in Istrien and when are ski conditions best?
- Istrien has the most snow in February with an average of around 6 cm. Those are the most reliable weeks for winter sports.
When is Istrien least busy while still having good snow?
- The best time for quiet winter sports in Istrien is January: with still around 6 cm of snow, the crowd level of about 0 out of 100 is below peak season.
How do you get to Istrien?
- Istrien is reachable via 6 destination airports with direct flights, including Dubrovnik Airport (DBV), Split Airport (SPU) and Zadar Airport (ZAD).
Quiet travel windows across Europe, once a month
The Crowd Report names the emptiest weeks of the coming months — for every region, not just this one. Free, unsubscribe any time.
Sources and data vintages
Every provenance note on this page, collected in one place.
- Cover photo
- Photo by Ivan Ivankovic on Unsplash
- Cover video
- Video by Martina Tomšič on Pexels
- Crowding figures
- Index 2.0 · As of 25/08/2026. v1 approximation, calculated from Eurostat overnight stays. Day tourism and cruises (Venice, Dubrovnik …) are still missing, so we show these destinations as quieter than they are. The crowd score is a model-based forecast, not a measurement.
- Climate data
- Generated using Copernicus Climate Change Service information 2025.
- Reachability
Data sources: direct connections from Wikipedia (“Airlines and destinations”, licensed CC BY-SA 4.0, aggregated and modified by us), cross-checked with Eurostat, Destatis and the UK Civil Aviation Authority; airport data from OurAirports (Public Domain). The derived connection data is licensed under CC BY-SA 4.0.
Data as of: September 2026
- Ski areas
Data sources: ski areas from OpenSkiMap, based on OpenStreetMap, licensed under ODbL 1.0; snow depths from ERA5-Land (Copernicus Climate Change Service).
- Region text
- Text by HolidayHub, written from Wikivoyage „Istrien“ (1746377) · Wikipedia „Istrien“ (270244870) · Wikidata Q639912. Wikivoyage and Wikipedia are licensed CC BY-SA 4.0, Wikidata CC0.
- Data basis
- All figures are approximations derived from open data (crowd level from Eurostat overnight stays, climate from Copernicus/ERA5-Land), not measurements.