We'll need to dress in layers in the coming days: the Indian summer is here.

BarcelonaWe've started the week with very calm and pleasant weather. And this will be the pattern for the next few days, with generally sunny skies and absolute calm. We can expect sunny days, thin clouds, morning fog, and a marked temperature contrast between the morning chill and the midday warmth. In fact, this Tuesday is Sant Martí (Saint Martin's Day), and this year the Indian summer will arrive right on schedule, with a peak in temperatures expected, especially between Wednesday and Thursday. This will be caused by a low-pressure system located in the Atlantic, which will push warm winds from North Africa, laden with suspended dust, towards our region.

There will also be a marked temperature inversion, with colder nights at lower elevations than at higher elevations. For example, this Monday in the Cerdanya region, a minimum temperature of -4°C was recorded in Das (1,100 m), much lower than the 3°C recorded at Tosa de Alp (2,400 m). Or also a minimum of -1°C in Pont de Suert (elevation 800 m) rising to 1°C in Boí (elevation 2,500 m), in the Alta Ribagorça region. An Atlantic front may change the weather on Friday.

Tuesday: absolute calm

The second day of the week will be very calm again. We'll get through another chilly morning with frost in the Pyrenees and Pre-Pyrenees valleys and some inland areas, and the temperature inversion will return. There will also be fog and low clouds in the plains and inland valleys, but by midday the highs will rise slightly, with generally pleasant weather. Many temperatures are expected to be between 16 and 22 °C. A day to enjoy, with sunshine, calm weather, and a few wispy, high clouds.

Warm peak in sight

Temperatures will rise even further between Wednesday and Thursday, with generally mild to warm conditions at midday. This will be the peak of the Indian summer, with many highs between 19 and 24 °C, and even around 25 °C in the warmest areas, especially in the south of the country. All this with dust in the air, absolute calm, and pleasant weather to enjoy. There will be little change in the sky compared to the beginning of this week.

The weather maps indicate that from Friday onwards we will once again be under the influence of Atlantic fronts. Although these fronts will arrive in our country relatively weakened, instability will increase, with a risk of showers in some areas. This situation remains uncertain and will need to be confirmed, but for now, it is not expected to cause temperatures to drop, remaining above average.