Seville heatwave forecast gap: 45°C predicted, 37.2°C recorded

July heatwave: 45°C forecast vs. 37.2°C measured

The thermometer in Seville read 37.9 degrees at four in the afternoon. That figure sparked the controversy. According to several forum participants, media reports had circulated forecasts of 45 degrees for the Andalusian capital, but one user noted the maximum only reached 37.2. This represented a nearly eight-degree difference between the announced catastrophe and reality. Another user described similar discrepancies on the Meseta plateau, where forecasts dropped from 42 to 36 degrees, and Saturday's prediction of 39 degrees resulted in an actual 33.

The feeling of witnessing two different summers—one in headlines, one on the street—drives a debate that starts with modest figures and ends by questioning how climate news is manufactured.

Why do heatwave forecasts often miss the mark?

Because meteorological models do not issue a single forecast, but a range of possible scenarios. Each is colloquially called a "run," and among them, there is always one warmer than the rest. Those who track this data daily observe a recurring pattern: media outlets systematically select the most extreme run to support their headlines, while actual temperatures remain several degrees lower. The result is a summer lived in antiestéticar, contrasted with a much milder reality.

The most cited example involves a headline announcing 49 degrees in Spain, a forecast figure never officially recorded. When such contrasts appear—the red map versus the window thermometer—trust in forecasting erodes, along with confidence in those who disseminate it.

The business of red maps

There is an added problem: the tonalidad scale used to translate temperatures into images. The same map can equate 29 degrees in Cádiz with 35 in León. According to this analysis, such visual standardization has a greater psychological effect than the data itself. A red map generates anxiety even if figures are not extraordinary; a blue one brings calm. When scales are adjusted to make everything seem extreme, the map stops describing weather and begins to describe its publisher.

How many weather stations exist in Spain and why does it matter?

It matters because, according to circulating calculations, Spain has between 2,000 and 3,000 stations, many installed recently. With such volume, the probability of any station recording a record—absolute high, higher low, or weekly average—in any month is very high. An isolated record in a single station says little; long-term trends are what count. Comparable long series are rare: El Retiro, Tortosa, Igueldo, and Fabra Observatory, among others. Stations with barely a decade of data cannot be compared to the past because they simply lack historical context.

Another issue remains open. It is claimed that the AEMET (Spanish Meteorological Agency) website sometimes shows five degrees more than conventional apps and home thermometers on the same day. This is not always due to poor measurement—sun exposure, location, or reading time affect results—but the discrepancy fuels suspicion.

Galicia and the summer that never arrived

While half the country watched the mercury, Galicia experienced a summer that did not feel like one. In Santiago de Compostela, temperatures stayed around 26 degrees. Recurring complaints mentioned sore throats, cool afternoons, and naps under blankets. While anecdotal, this illustrates a larger point: heatwave narratives are national and uniform, while real experiences are local and uneven. The same headline applies to Seville's 40 degrees and Santiago's 26.

From "oppressive heat" to climate emergency

There was a time when July heat was described with just two words: oppressive heat. A 1993 headline summarizes the shift: "Oppressive heat in Seville during summer." Today, the same temperature comes wrapped in warnings about cars, meat, and the planet. Heat has not changed as much as the framework explaining it. Yesterday it was attributed to the ozone layer; today to climate change; tomorrow, who knows.

It is useful to separate two things mixed by noise. Scientific consensus attributes increased extreme episodes to greenhouse gas emissions; the disagreement captured here concerns not climate physics, but how these episodes are communicated and the margin between model and measurement.

The discussion reaches no conclusion. One fact stands out: while the hottest summer and driest year were announced, some regions recorded persistent rains and temperatures below previous summers. July heat exists; needing an alarmist headline for every degree is another matter. The analysis stalls here: with models open to extreme scenarios and limited access to long series, no one can say with certainty whether we face a historic summer or simply a well-told one.