Byblos (Jbeil) weather in September

Forum posters describe Lebanon's coast in December as bringing warm-ish days and cool evenings, typically 10-20C, with the last two weeks of the month turning genuinely cold and rainy - posters note the interior mountains can drop to around 5C, distinctly colder than the coastal towns like Byblos, Saida and Sour where winter stays comparatively mild. Posters are consistent that rain is the main weather challenge along the coast this time of year, sometimes falling even when temperatures still sit around 20C. Posters generally rate December as a rewarding time to explore Byblos and Lebanon's other historic coastal sites despite the rain risk, describing conditions overall as not too cold and not too hot. Posters generally rate December as mild by day, cool and often wet by night for Byblos, workable for sightseeing with rain gear on hand.

Forum posters name June as one of the best months to visit Lebanon overall, with average highs around 28C and lows around 21C - warm, dry and comfortable rather than the more intense heat of high summer. Public and private beaches along the coast, including around Byblos, are open from mid-May through mid-October, so June sits comfortably within that full beach season. Posters describe June through September broadly as prime time for sun, beaches, mountain escapes and cultural festivals - the Byblos Festival specifically draws visitors to one of the world's oldest continuously inhabited cities, with its souks and Crusader sea castle repeatedly named among the top sights in the country.