Bilbao will go from temperatures of 35 ºC to 25 ºC at once, in anticipation of the instability that will arrive next week.

Temperature variations for Saturday, September 5 in the Peninsula and the Balearic Islands.  AEMET.

The first weekend of September arrives with stable, sunny and generally hot weather for this time of year. except in the northern third, where tomorrow saturday thermometers will plummet up to 10 degrees, preamble of the changes and the instability that is expected at the beginning of the week.

For now, Friday the day will be clear in most of Spain and they will reach exceed 34 or 35 degrees in the Cantabrian area, in the interior of the Basque Country, Galicia and in the Ebro and Duero valleys, as reported Ruben del Campo, spokesperson for the State Meteorological Agency (Aemet).

The summer heat will be especially noticeable this day in the valleys of the Tagus, Guadiana and Gudalquivir, where the thermometers will mark highs above 36 degrees.

Forecast for Friday, September 4.

The exception to this clear and summer weather will be some low clouds that will accumulate in coastal areas, especially in the Strait area, where today the east will blow strong, with gusts that can exceed 50 or 60 kilometers per hour.

The good weather will continue in general tomorrow Saturday, but the arrival of winds from the north will increase cloudiness and rain in the interior of Galicia and in the Cantabrian communities, rainfall that will spread from west to east.

This instability in areas of the north of the peninsula will cause there an “extraordinary” drop in temperatures, as indicated by the Aemet spokesperson, on occasions of up to 10 degrees less than today Friday, especially in the interior of the Cantabrian communities.

As examples, he cited that in Bilbao it will go from a maximum of 35 degrees this Friday, to 25 on Saturday, or that in Reinosa, in the interior of Cantabria, will reach 30 degrees today, but tomorrow they will not exceed 18. Meanwhile, in the rest of the country the thermometers will hardly move tomorrow compared to today and will even rise slightly in the eastern half of the peninsula.

On Sunday the clouds and rains will continue in the Cantabrian communities and clouds of diurnal evolution will grow that can give rise to stormy showers in the Pyrenees area, where they could be locally strong.

Clouds of evolution will also form and stormy showers in the surroundings of the Iberian System, especially in the south of Aragon and north of the Valencian community, without ruling out a storm in nearby areas.

The temperatures will continue to drop on Sunday in the northern third of the peninsula, a descent that from that day on will spread more gently to the Mediterranean regions.

However, in Extremadura and Andalusia will continue to exceed 36 degrees maximum and also It will be hot on Sunday in the west of Castilla y León and in the south of Galicia, where will be around 32 degrees, while in many parts of the Cantabrian Sea they will barely reach a maximum of 20 degrees.

The changes will be noticed early next week due to the presence of a trough high in the atmosphere which, together with the arrival of winds of maritime origin from the eastern component, will cause on Monday showers in the Mediterranean peninsular regions and in the Balearic Islands.

He too Monday it could rain locally strongly in Catalonia and the Valencian community and probably extend to the Murcia region, eastern Andalusia, eastern Castilla-La Mancha and nearby areas. In the Cantabrian area, however, the rains will subside and in the western half of the peninsula the sun will shine in general.

The temperatures will drop at the beginning of the week in the center and in the east of the peninsula, but it will continue to be hot in the summer in Extremadura and western Andalusia, as well as in the Canary Islands, where it will probably exceed 35 degrees in its midst.

As of Tuesday 8, and although with “a certain margin of uncertainty”, according to Aemet, it could continue instability in the Mediterranean environment and there would be showers, sometimes locally strong, that would also reach the Balearic Islands.

Forecasts suggest that in the rest of the country skies will be slightly cloudy or clear on Tuesday and that the temperatures in general will have normal values ​​for the beginning of September, or could even be somewhat cool in the Mediterranean as a result of the precipitations.