IstriaPhoto: Einaz80 · CC BY-SA 4.0Croatia · Europe
Best time to visit Istria
Istria in northern Croatia offers clear Adriatic water, pretty coastal towns and good food. Easy to reach by car.
Climate decision
Best travel months for Istria
Top recommendation
Next highest scores
Historical monthly averages, not a weather forecast. Individual days and years can differ substantially.
Latest 5-year values 2021–2025
Average of the five most recent complete years compared with the 1991–2025 climate average.
February · Mean daily maximum
10.4 °C
1991–2025: 8.8 °C
+1.6 °C · higher
June · Wet days
7.2 days/month
1991–2025: 9.8 days/month
-2.6 days/month · lower
July · Monthly precipitation
70.2 mm/month
1991–2025: 52.7 mm/month
+17.5 mm/month · higher
August · Sea temperature
26.1 °C
1991–2025: 25.2 °C
+0.9 °C · higher
July: 33/155 days at or above 30 °C; highest single value 35.5 °C.
Five-year historical sample, not a weather forecast or long-term climate trend. Individual hot days can be far above the monthly mean.
Annual profile · Coast and sea
Istria: the swimming season follows two curves
Average daily highs vary by 19.7 °C through the year, while the sea varies by 14.3 °C. Air and water temperature should therefore be considered separately.
The practical difference
The month with the highest daytime temperature and the month with the warmest sea need not define the same travel window. Rain and sunshine help resolve the trade-off.
Warmest sea
August · 25.2 °C
Highest average daily high
August · 27.6 °C
Fewest rainy days
February · 8.4
Most sunshine
July · 8.2 h
Month by month
Overall suitability per month. Tap a month for details.
All climate figures compared
The table is the complete accessible data view; the charts below highlight selected patterns.
| Month | Avg high °C | Avg low °C | Rainy days (est.) | Rain mm | Sun h/day (est.) | Humidity % | Wind m/s | Sea °C | Score |
|---|---|---|---|---|---|---|---|---|---|
| January | 8 | 4 | 10 | 72 | 1.7 | 82 | 3.8 | 12 | 30 |
| February | 9 | 4 | 8 | 76 | 2.8 | 79 | 3.8 | 11 | 35 |
| March | 12 | 6 | 9 | 69 | 4.4 | 77 | 3.4 | 11 | 41 |
| April | 15 | 10 | 11 | 73 | 5.9 | 76 | 3.0 | 13 | 48 |
| May | 20 | 14 | 12 | 82 | 7.2 | 75 | 2.7 | 17 | 63 |
| June | 24 | 19 | 10 | 63 | 8.0 | 72 | 2.5 | 22 | 83 |
| July | 27 | 21 | 9 | 53 | 8.2 | 66 | 2.5 | 25 | 86 |
| August | 28 | 21 | 9 | 67 | 7.1 | 65 | 2.6 | 25 | 85 |
| September | 23 | 17 | 11 | 110 | 5.1 | 71 | 3.1 | 23 | 79 |
| October | 18 | 13 | 11 | 109 | 3.2 | 78 | 3.5 | 20 | 59 |
| November | 13 | 9 | 13 | 131 | 1.8 | 81 | 3.8 | 17 | 36 |
| December | 9 | 5 | 11 | 100 | 1.4 | 82 | 3.9 | 14 | 30 |
Climate through the year
Compare temperature, rainy days, sunshine and, for coastal destinations, sea temperature month by month.
Find a place to stay
Where to stay in Istria
Compare available stays, prices and cancellation terms for Istria on Booking.com.
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Useful next decisions
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The number is the overall climate score, not a similarity score.
Country and region
Frequently asked questions
When is the best time to visit Istria?
The strongest climate months are June, July, August, September. Values are historical averages, not a forecast.
Which month has the highest average daily maximum temperature in Istria?
The average daily maximum temperature in Istria is highest in August at around 28 °C.
When is the sea warmest at Istria?
In August, at around 25 °C.