Pogoda Mostar — sierpień

August is the warmest water and the most settled weather of the Croatian year, and also the fullest: the forum's line is that the last weekend of July and the first half of August are packed more or less everywhere, with the busy stretch running from mid-June to the end of August and peaking in the middle of it. The compensation regulars offer is that the islands absorb the season better than the walled cities do - it is quite possible to be on a Dalmatian island in mid-August and not feel crowded in the way Dubrovnik makes you feel it. Booking the catamaran ahead matters in this month. The record: 29.2C days that feel like 33C, 23.7C nights, 5.1 precipitation days carrying 45.5mm, 12.4 hours of sun and a 26.4C sea.

Forum posters describe Mostar's southern Herzegovina location as giving it a noticeably milder winter climate than northern Bosnia, with snow uncommon here - wind and rain are more likely worst-case scenarios for a December visit. Posters generally describe Bosnian winters as trending milder in recent years, though genuine surprises remain possible. Posters consistently note that the road into Mostar is well maintained and kept clear of snow even during winter weather elsewhere in the country, with rental cars typically supplied with snow tires as a precaution regardless. Posters generally rate December as a comparatively mild, manageable time to visit Mostar relative to the rest of Bosnia and Herzegovina, wind and rain the more likely weather challenge than snow or ice.

Mostar is the hottest place in Bosnia and Herzegovina — too far inland for the sea to cool it, and on a Mediterranean rather than a mountain climate — so June here reads very differently from June in Sarajevo. Days average near 28°C and the forum reports spells reaching 35°C; nights fall to about 16. The other June problem is size: the old town is small and gets completely crowded, with day-trippers off the Croatian coast and pilgrims bound for Medjugorje on top of everyone else. Regulars' fix is to stay overnight rather than day-trip, which also opens up Blagaj's dervish house and river source, and the castle town of Počitelj.