Seine water levels in September

For September 2026 the Seine shows a 100% chance a cruise runs as planned: low risk. 26 days of this September are already on record. The figure counts what the river actually did on those days and the live forecast for the days left.

On the Seine the risk runs the other way: high water. Too little clearance under the Paris bridges pauses sailings and closes moorings. The river never dries out. It rises.

September stays quiet as the Seine's catchment sits dry from summer. The flood season is still months away.

September has gone without high water in roughly 100% of the past thirty years on this river, the calmest of the twelve months. September and July run calmest on the Seine; March and February reward flexible plans.

The last five Septembers, from the official record: 2025 clear · 2024 clear · 2023 clear · 2022 clear · 2021 clear. All five recent Septembers came through clear.

For your own dates, the cruise checker scores the exact window day by day. The Seine page carries the live gauges, and when to go compares all four rivers.