**Mount Vesuvius remains at green alert level with all monitored parameters at ordinary background values through mid-September 2026.** The Osservatorio Vesuviano’s latest monthly bulletin for August recorded only low-energy seismicity (112 events, maximum magnitude ~1.6, nearly all below 1.0), predominantly shallow and crater-focused, with no ground deformation linked to magmatic sources, stable crater temperatures, and a continuing multi-year decline in hydrothermal activity. These conditions align with the volcano’s quiescent phase since its last eruption in March 1944 (VEI 3), during which hundreds of micro-earthquakes occur annually without escalation. Traders assign a 95.4% probability to “No” because a VEI 1+ event (even a modest Strombolian or small explosive episode) would normally be preceded by detectable precursors—rising seismicity, inflation, or geochemical shifts—none of which are present. With roughly three and a half months left in 2026 and no signs of unrest, the window for an unheralded eruption has narrowed sharply. A realistic shift could occur only if rapid, undetected acceleration in activity develops in the final months, though historical and current monitoring data indicate that meaningful precursors typically appear weeks in advance. Absent such changes, the market-implied odds reflect the strong scientific consensus on the volcano’s current stable state.