A high-water river

The Seine

Next 12 months

water = chance the month goes as planned · dot = live forecast

Nov*

Dec*

Jan*

Feb*

Mar*

Apr*

May*

Jun

Jul

Aug

Sep

Oct

Last five years, month by month

The five years before each month, most recent on top · marks are months that hit high water · solid = a week or more

Water height = the chance the month goes as planned, so a full column is a comfortable booking. Water below the dashed line: the itinerary may flex. Hover any month for its figure. *Months use the live forecast; the rest use the thirty-year record. The month we are in counts the days already on record.

RAIN · upper Seine basin (Troyes, Châtillonnais): last 45 days 204 mm vs 229 mm normal (-11%) · next 16 days 145 mm vs 76 mm (+90%)

Seine at Paris

Paris, where the risk is flood rather than low water: the Seine is locked and rain-fed

PARIS-AUSTERLITZ 92 cm · normal

Today vs 30 years: p0.5
Status now: normal range
The trouble line: 838 m³/s
This week: 99% as planned

Weekly outlook · 30 weeks

2026-11-112027-06-02

Weekly outlook, thirty weeks: water level = chance the week goes as planned.

2026-11-112027-06-02

Seine at Vernon

mid-Seine between Paris and Rouen

MODEL 99 m³/s · normal

Today vs 30 years: p0.6
Status now: normal range
The trouble line: 1163 m³/s
This week: 99% as planned

Weekly outlook · 30 weeks

2026-11-112027-06-02

Weekly outlook, thirty weeks: water level = chance the week goes as planned.

2026-11-112027-06-02

Has it been like this before?

Yes. The Seine at Paris sat at almost exactly today's flow in 2018, within 0.2% of where it is now.

Here is what the river did over the six weeks after each of the closest years. Nothing here is a forecast. It's the measured record.

Year	Date	Flow	vs today	Back over the line	Days high of the next 42
2018	October 26	73 m³/s	+0.2%	after 1 day	0
2011	November 24	73 m³/s	+0.5%	after 1 day	3
2020	November 14	74 m³/s	+0.9%	after 1 day	0
2005	November 23	87 m³/s	+19.4%	after 1 day	0
2017	November 3	91 m³/s	+24.5%	after 1 day	0

The pattern is the useful part. In every one of those years the river climbed back over the line, and it took between 1 and 1 days to do it. What it didn't do was stay there: in the harder years it dropped back under repeatedly through the autumn. That is why a cruise in a high-water spell usually means a rerouted day or two rather than a lost holiday.

Flow figures are the European Union's GloFAS record for Seine at Paris, measured on November 10 and the same date in each earlier year. The line is the level below which this stretch has run only 12% of the time in thirty years.

Where these numbers come from: how it works. Still picking a date? Start with when to go.