Croatia (Istria) · September
Best travel monthTravel seasonCroatia · Europe
Climate Overview
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
Ø day, range from coolest to warmest dayØ dayrange | 10° (50°)5– (41–)15 (59) | 11° (52°)4– (39–)15 (59) | 14° (57°)8– (46–)19 (66) | 18° (64°)11– (52–)23 (73) | 22° (72°)15– (59–)27 (81) | 27° (81°)21– (70–)32 (90) | 30° (86°)25– (77–)35 (95) | 30° (86°)22– (72–)34 (93) | 25° (77°)18– (64–)30 (86) | 20° (68°)14– (57–)24 (75) | 15° (59°)9– (48–)20 (68) | 12° (54°)6– (43–)16 (61) |
Ø night, range from coldest to warmest nightØ nightrange | 2° (36°)-4– (25–)10 (50) | 3° (37°)-4– (25–)9 (48) | 5° (41°)-3– (27–)11 (52) | 8° (46°)1– (34–)14 (57) | 12° (54°)6– (43–)18 (64) | 17° (63°)11– (52–)21 (70) | 19° (66°)14– (57–)23 (73) | 19° (66°)13– (55–)24 (75) | 16° (61°)9– (48–)20 (68) | 12° (54°)5– (41–)17 (63) | 8° (46°)-1– (30–)14 (57) | 4° (39°)-3– (27–)11 (52) |
☀️Sunshine | 3h UV 3 | 4h UV 4 | 6h UV 5 | 7h UV 6 | 7h UV 7 | 9h UV 8 | 9h UV 8 | 8h UV 7 | 6h UV 6 | 5h UV 4 | 3h UV 3 | 3h UV 2 |
🌊Water Temp | 13° (55°) | 12° (54°) | 12° (54°) | 14° (57°) | 18° (64°) | 22° (72°) | 24° (75°) | 25° (77°) | 22° (72°) | 20° (68°) | 17° (63°) | 15° (59°) |
🌧Rain Days | 6d73mm (2.9") | 7d82mm (3.2") | 6d67mm (2.6") | 6d57mm (2.2") | 7d81mm (3.2") | 4d51mm (2.0") | 3d39mm (1.5") | 5d67mm (2.6") | 6d108mm (4.3") | 6d80mm (3.1") | 8d144mm (5.7") | 7d108mm (4.3") |
Best travel time current monthØ = average · small figures = range: coolest–warmest day / coldest–warmest nightClimate data 2005–2025 · Source: ERA5 + station data
Travel season — mid-range prices, good availability.
September is one of the best travel months for Croatia (Istria) — conditions are stable, temperatures reach 25°C (77°F), and outdoor activities are excellent.
Daytime highs average 25°C (77°F), cooling to 16°C (61°F) at night (daily average: 20°C (68°F)). Peaks reach around 30°C (86°F), the coldest nights around 9°C (48°F). With 6 sunshine hours per day and 6 rain days (108 mm (4.3 in)), this is one of the cloudier months. Sea temperature is 22°C (72°F) — pleasantly warm for long swim sessions.
Pack light summer clothing, sunscreen, and swimwear — beach and water conditions in September are ideal.
The Istrian autumn belongs to the food-minded: grape harvest, olive picking, and from October the white truffle around the Motovun forest. The sea holds 19 to 22°C (66 to 72°F) into October; November turns wet.
Packing list for Croatia (Istria) in September
- T-shirts and shorts
- Light jacket for cool evenings
- Swimwear (the water is still a little fresh)
- Sunscreen
- Sunglasses
- Small umbrella (occasional showers possible)
- Travel first-aid kit
Frequently Asked Questions
- Is September a good time to visit Croatia (Istria)?
- Yes — September is one of the best months to visit Croatia (Istria) (Climate Score: 61/100). Pleasant temperatures (25°C (77°F)), good sunshine (6 h/day), and few rain days (6) make it one of the most recommended months.
- How warm is it in Croatia (Istria) in September?
- In September, Croatia (Istria) sees daily highs of 25°C (77°F). Nights cool to 16°C (61°F), with a daily average of 20°C (68°F). Peaks reach around 30°C (86°F), the coldest nights around 9°C (48°F).
- How much rain falls in Croatia (Istria) in September?
- In September, Croatia (Istria) receives an average of 108 mm (4.3 in) of rain over 6 rain days. An umbrella may occasionally be needed.
- How many sunshine hours does Croatia (Istria) get in September?
- Croatia (Istria) averages 6 sunshine hours per day in September — close to the annual average.
- How warm is the water in Croatia (Istria) in September?
- Water temperature in Croatia (Istria) in September averages 22°C (72°F) — pleasantly warm for swim sessions.
