Herceg Novi, where it's located

The climate of Herceg Novi is Mediterranean, with mild, rainy winters, and hot, sunny summers.
Herceg Novi (or Castelnuovo) is located on the Adriatic coast, in the area of the Bay of Kotor.
The average temperature of the coldest month (January) is of 8.5 °C (47 °F), that of the warmest months (July, August) is of 24.3 °C (76 °F). Here are the average temperatures.
Herceg Novi - Average temperatures
Min (°C)5571014171919171396
Max (°C)121315182326292926221714
Min (°F)414145505763666663554843
Max (°F)545559647379848479726357

Precipitation amounts to 1,835 millimeters (72.2 inches) per year: it is therefore abundant. It ranges from 45 mm (1.8 in) in the driest month (July) to 235 mm (9.3 in) in the wettest (December). Here is the average precipitation.
Herceg Novi - Average precipitation

On average, there are around 2,435 sunshine hours per year: therefore, the amount of sunshine is good. Here are the average sunshine hours per day.
Herceg Novi - Sunshine

The sea temperature ranges between 14 °C (57 °F) and 25 °C (77 °F). The sea is warm enough for swimming from July to September. Here are the average sea temperatures.
Herceg Novi - Sea temperature
Temp (°C)141414151821242523201715
Temp (°F)575757596470757773686359

Herceg Novi

Best Time

The best times to visit Herceg Novi are spring and autumn, namely the months of May and September. In June, the weather is often excellent, but it can sometimes get hot, especially in the second half of the month.
The best months for a beach holiday are July and August. In June, the sea is still a little cool.