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After an episode of heat wave in Brittany in mid-June, The weather will change During the week from Monday 23 to Sunday 29 June 2025.
As announced previously, temperatures dropped during the Music Festival evening. The reason? “The wind turnedreplies Sébastien Decaux, meteorologist for Météo Bretagne. Before, we had an earth wind from the Southeast. These very hot winds from North Africa have given way to a cooler ocean windSaturday June 21.
Drop in temperatures, rain et possible thunderstorms, Rennes news takes stock of the week’s forecasts.
In Rennes, 10 ° C gap with the previous weekend
This Monday, time is variable. The cloudy sky in the morning should give way to the sun. “The thinning will return from the north and will extend to the whole region,” said the meteorologist.
Temperatures will be “Pleasant”. In Rennes, it will be up to 26 ° C, more than 10 ° C difference with the day on Saturday and its 36.9 ° C recorded.
Temperatures above seasonal normal
Although temperatures are in decreases this week, these remain on average above seasonal normal. In Rennes, for example, the standard recorded for a late June is 24 ° C.
Mercury will go up to 24 ° C in Vannesor 22 ° C in Dinan. “It will be fresher on the coast with 20 ° C in Saint-Malo. »»
Tuesday, “It will be a very nice summer day, with a few mists and fog in the morning, notes our interlocutor. But the sun will dominate all day ”.
The Breton coastline will remain fresher with Between 20 and 23 ° C.
Inside the land, the mercury will significantly rise. 27 ° C is provided in Pontivy, 28 ° C in the Rennes basin and up to 30 ° C in La Guerche-de-Bretagne.
Deputy hollow and expected thunderstorms
Wednesday will be marked by “A configuration change” with the arrival of a thalweg, Either “a depressional hollow surmounted by cold air at altitude”, specifies Sébastien Decaux.
This mass of air will settle in the region and train instability “with showers and thunderstorms”.
Showers will come across Brittany particularly The morning, Before a respite and clearings in the afternoon.
A possible stormy degradation is expected in the evening, especially in eastern Brittany. To date, there are strong signals, but not precise enough to anticipate their location. Thunders and showers will be located.
A situation which could lead to the placement by Météo France of certain Breton departments In yellow vigilance storms, the minimum.
Summer temperatures but a mixed weather
The weather will change again from THURSDAY, With an Oceanic West flow. “Time will be mixed With showers and disruptions rather in the morning, ”informs Sébastien Decaux.
“Temperatures will drop, with 23 ° C in Saint-Brieuc and Vannes, and 25 ° C in Rennes. This remains summer temperatures. »»
Friday, The sky will vary with very localized or even absent showers, Due to a high pressure.
The anticyclone of Azores returns with the sun menu and increasingly high temperatures.
A trend that will continue Saturday and Sunday. This last day of the weekend will be “The hottest day of the week”.
The week from June 30 to July 6 should see its temperatures above seasonal norms continue depending on the different models. “The state of the sky is difficult or even impossible to predict,” concludes the meteorologist.
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