Overview

• Siebenschläfertag’s rule dates to a Christian legend and claims that June 27 weather presages conditions for the next seven weeks.
• Forecasters predict today’s weather will be predominantly cloudy and rainy, with scattered storms across much of Germany.
• Experts note the 1582 calendar reform shifted the original Siebenschläfertag to July 7, and emphasize the entire late-June to early-July period as the true marker for summer trends.
• The rule’s hit rate varies regionally from about 55 percent inland to around 70 percent in the Alpine foreland.
• The Deutscher Wetterdienst now gives over 90 percent odds to above-average July–September temperatures, with forecasters warning of potential record heat and increased drought risk.