Loire-Atlantique Weather: Meteorologist Warns “The Worst Is Yet To Come

The month of January 2026 will have been particularly humid in Loire-Atlantique, this will have escaped no one’s notice. Without reaching the rainfall records of a year ago, the department recorded heavy rainfall. Over the month, 118 mm of rain fell in Nantes and 178 mm in Saint-Nazaire. The most affected municipality is Herbignac with 210 mm. At the scale of the month and the country, the excess rainfall reached 30%,” explains Météo France in its monthly report.

READ ALSO. “We have 60% more rain”: the results of the first month of 2026 in Loire-Atlantique

Those who wanted to be reassured for February 2026 will be disappointed. After a rainy first week, although with a little more sunshine than in January, the rest of the month does not look very encouraging. The worst is yet to comewarns Steven Tual, meteorologist who manages the Temps breton Facebook page.

Yellow rain-flood alert and orange flood alert

After multiple yellow alerts, the Loire-Atlantique has been placed on orange flood alert since Tuesday February 10, 2026, in particular for the Nantes Sèvre. At the same time, the department is on yellow rain-flood alert this Tuesday February 10 and Wednesday February 11, 2026. The wind will replace the storm on Wednesday also on yellow alert.

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It is between Wednesday February 11 and Thursday February 12, with the arrival of storm Nils, that the accumulation of rain will be the most significant. between 30 and 50 mm are expected across the entire departmentexplains Steven Tual. Calm days will be rare during this month. If an improvement is expected for Saturday February 14, the rain should return the next day. There will be no improvements before February 20 at least. After this date, an anticyclone over the Azores is emerging but this is still hypothetical.

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Flood risks

The situation will be very rough and even dangerous on the coast with wind and strong swells, reaching 10 to 12 m on Wednesday and Thursday.

Steven Tual also calls for vigilance regarding the risk of flooding on several rivers including the Loire and the Vilaine watersheds. We should not experience a situation similar to the big floods of January 2025, but the border is shrinking and certain municipalities like Redon and its surroundings are at risk.“, he says.

Two flooded roads north of Loire-Atlantique

On the traffic side, two roads were cut this Tuesday, February 10 in the north of Loire-Atlantique due to flooding. This is the D255, linking Massérac and Avessac, at the latter commune. The other road is the D125, a road linking the municipalities of La Chapelle-de-Brain and Massérac.