Click on a day for an hourly weather forecast
The temperatures in Istria in May are comfortable with low of 15°C and and high up to 19°C.
You can expect about 3 to 8 days of rain in Istria during the month of May. It’s a good idea to bring along your umbrella so that you don’t get caught in poor weather.
Our weather forecast can give you a great sense of what weather to expect in Istria in May 2025.
If you’re planning to visit Istria in the near future, we highly recommend that you review the 14 day weather forecast for Istria before you arrive.
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | 9° / 6° | 8 | 22 | 1 | 139 mm | Bad | Istria in January |
| February | 10° / 6° | 7 | 20 | 1 | 180 mm | Bad | Istria in February |
| March | 12° / 8° | 7 | 24 | 0 | 126 mm | Bad | Istria in March |
| April | 16° / 11° | 6 | 24 | 0 | 110 mm | Good | Istria in April |
| May | 19° / 15° | 7 | 24 | 0 | 160 mm | Ok | Istria in May |
| June | 24° / 19° | 6 | 24 | 0 | 137 mm | Perfect | Istria in June |
| July | 27° / 22° | 6 | 25 | 0 | 136 mm | Perfect | Istria in July |
| August | 28° / 23° | 5 | 26 | 0 | 120 mm | Perfect | Istria in August |
| September | 23° / 19° | 7 | 23 | 0 | 239 mm | Good | Istria in September |
| October | 18° / 15° | 7 | 24 | 0 | 199 mm | Ok | Istria in October |
| November | 14° / 11° | 9 | 21 | 0 | 259 mm | Ok | Istria in November |
| December | 11° / 8° | 8 | 23 | 1 | 179 mm | Bad | Istria in December |