The European Central Bank (ECB) has published an assessment indicating that extreme heat during summer 2026 caused unusually widespread disruption to euro area construction, but likely had only a small, temporary effect on output. Historical estimates imply a limited drag on construction activity in the third quarter, followed by a corresponding rebound in the fourth quarter and a negligible effect on overall economic activity.
The share of construction firms reporting weather as a constraint reached 7.8% in August, the highest August reading since records began in 1991, compared with a July and August average below 3%. Constraints eased to 5.5% in September but remained unusually high. Applying historical relationships between reported weather constraints and production suggests that weather disruption lowered construction output by around 0.2% in July, 0.3% in August and 0.1% in September. The estimated effects subsequently unwind as postponed work is completed. These estimates isolate weather effects rather than explain actual monthly output movements, which also reflect other factors.
Uncertainty is considerable because the historical evidence mainly reflects cold weather disruptions, and stricter heat safety rules introduced in recent years could increase construction activity’s sensitivity to high temperatures. Firms may also attribute weakness to weather when other factors contribute, potentially overstating its effects. More frequent or prolonged extreme heat could make postponed work harder to recover and impose more persistent costs through working hour restrictions and adaptation. For the current episode, however, weakness linked to weather in third quarter data need not signal weaker underlying construction momentum.