The best time to visit Rhodes is May to June or September to October, when daytime temperatures sit between 22°C and 28°C, the sea is warm enough for swimming, and the island hasn't yet hit peak-season crowds or prices.
Spring (April–May): Wildflowers carpet the hillsides and the Palace of the Grand Master is largely tourist-free. The sea reaches about 19–21°C by late May — chilly for some but fine for a dip. Ideal for walkers and history lovers.
Early summer (June): The sweet spot. Reliably hot (25–30°C), sea at 23°C, long evenings, and restaurants and boat trips all fully open. Crowds are building but not oppressive.
High summer (July–August): Peak heat (35°C+ is common), peak prices, and peak crowds — the Old Town can feel uncomfortably busy by 11:00. Still a great beach holiday if you book accommodation well in advance and plan sightseeing for early morning. West-coast beaches get afternoon winds, which is a plus for kite-surfers.
Early autumn (September–October): Arguably the best overall window. The sea peaks at 26°C in September — warmest of the year. Crowds thin after the first week of September, prices drop, and the light turns golden. October remains warm (22–25°C) but some smaller restaurants begin closing mid-month.
Winter (November–March): Rhodes is quiet and sometimes wet, but mild by northern European standards (12–16°C). The Old Town is atmospheric with almost no other tourists, and several hotels stay open at very low rates. Not a beach trip, but a rewarding cultural one.