Luxembourg's biggest public holiday will unfold under a red heat alert, with forecasters warning of tropical nights and a felt temperature approaching 39C - a local reckoning with Europe's accelerating warming.
MeteoLux has active heat vigilance for 29-30 May as Luxembourg records an unusually early run of hot days. The new 2026 warning model focuses on perceived heat, duration and health risk.
Luxembourg residents should use MeteoLux and health guidance to prepare for heat days before vulnerable people are already at risk.
Luxembourg's national weather service Meteolux issued a yellow rainfall alert covering the entire country on 10 May 2026, valid from 18:00 Sunday to 07:00 Monday. Forecasters expect 15 to 30 millimetres of rain in twelve hours, with the bulk arriving from the south during evening hours.