While attractions across much of the Czech Republic are closed or keep limited hours outside the summer season, Prague caters for visitors all year round. Periods when the tourist crush is especially oppressive include the Easter and Christmas/New Year holidays, as well as May and June. Many Czechs go on holiday in July and August, during which time the supply of bottom-end accommodation actually increases, as student hostels are opened to visitors. If you can put up with the cold and the periodic smog alerts during weather inversions, hotel space is plentiful in winter (outside Christmas/New Year), and Prague is gorgeous under a mantle of snow.

Prague lies in the transitional area between maritime and continental climates, characterised by hot, showery summers, cold, snowy winters and generally changeable conditions. A typical day in Prague from June to August sees the mercury range from about 12°C (54°F) to 22°C (72°F). Temperatures from December to February push below freezing. Wide variations are common, sometimes surpassing 35°C (95°F) in summer and -20°C (-4°F) in winter. The closest thing to a 'dry season' is from January to March, when total precipitation (mostly as snow at that time) is less than a third of that during the wettest months, June to August. And yet January averages as many 'wet' days (about two out of five) as the summer months do. The summer's long, sunny, hot spells tend to be broken by sudden, heavy thunderstorms. May and September have the most pleasant weather.