On Thursday 18 June 2026, Luxembourg's national weather portal, MeteoLux, issued an orange heat warning covering the entire country.

MeteoLux is indicating "danger" nationwide from 00:00 on Friday 19 June until 00:00 on Sunday 21 June 2026.

According to MeteoLux, significant heat stress is expected, with high perceived temperatures persisting for at least two consecutive days. Heat exhaustion is considered likely, while heatstroke is possible in cases of prolonged exposure or physical activity.