Overview

• The Siebenschläfertag on June 27 draws on a centuries-old farmer’s rule that ties that day’s weather to conditions for the following seven weeks.
• The name comes from the 3rd-century legend of the Seven Sleepers of Ephesus and was shifted to June 27 by the 1582 Gregorian reform.
• As of June 24, daytime highs of 25° to 32°C across Germany and southern peaks above 35°C have been driven by a stable high-pressure ridge.
• Meteorologists say a dominant high-pressure system at the end of June often brings prolonged hot, dry spells, reinforcing this year’s heat pattern.
• If the current trend continues, summer 2025 could rank among the five hottest in Germany since records began in 1881.