August is usually the hottest month of the year for Prague, Czech Republic. During this month, the average temperature for the city begins at 18.5°C, created by highs of 24°C during the daytime and lows of 13°C after dark. This gradually drops down to an average of 17.5°C by the middle of the month, created by highs of 23°C during the daytime and lows of 12°C after dark, before reaching a low of 16°C by the end of the month, created by highs of 21°C during the daytime and lows of 11°C after dark. This makes the first week of August the best time to visit if you want to holiday in Prague when the city is at its hottest.

Although it only occurs on an average of once every ten days, temperatures can sometimes rise above 29°C and fall below 7°C in Prague in August. The hottest temperature ever recorded in the city during this month is 37°C, whilst the coldest temperature ever registered here during this month is 5°C.