April to June: Spring brings wildflowers to the mountains and the softest of blue skies over Bucharest and also prompts a great migration of birds through the Delta. Temperatures range from 15°C in April to 25°C in June. Rainfall is moderate, around 40-70mm, with 7-10 hours of sunshine daily.
July to August: Although by far the hottest time of the year, summer is the perfect time to investigate Transylvania's festivals and hiking trails, though brief but violent thunderstorms are common in the Carpathians during this period. Temperatures can soar to 30°C, making it ideal for visits to the Black Sea coast; however, this is peak crowd time. Rainfall is minimal, so expect long, sunny days with up to 12 hours of sunshine.
September to November: Autumn is a fantastic time for holidays to Romania as the weather cools, with temperatures ranging from 25°C in September to 10°C in November. The autumn colours in the Carpathian Mountains are spectacular, making it a great time for hiking, especially in September. Rainfall increases slightly to 50-80mm, but there are still plenty of dry, crisp days.
December to March: Winters can be brutal – snow blankets much of the country, temperatures of -15°C to -20°C are not uncommon, and a strong, icy wind (the criva≈£) sweeps down from Russia. Daytime temperatures in cities like Bucharest range from 0°C to 5°C, while the mountains offer excellent skiing opportunities.