Storms, Heat and Instability: Jorge Rey's May 2026 Weather Forecast for Spain

The Forecaster Who Beat AEMET to It

Jorge Rey has become one of Spain's most followed weather voices — not through satellite data or supercomputer modelling, but through the ancient cabanuelas method: a traditional Spanish forecasting approach that involves observing atmospheric conditions, natural phenomena and animal behaviour during specific periods. Rey gained national attention after correctly predicting the catastrophic Filomena snowstorm of 2021 before Madrid's professional meteorologists did, and he now has tens of thousands of regular followers on social media.

He has released his May 2026 forecast for Spain ahead of the official AEMET outlook — and the picture he paints is one of a characteristically unsettled Spanish May, with storms, instability and heat all making appearances at different points through the month.

Week-by-Week Breakdown

May 1–3 (Bank Holiday Weekend)
Persistent rain in Galicia and the Cantabrian coast. Cloudy skies across central Spain with possible light showers. Mild conditions in the south, with stability along the Mediterranean coastline.

May 4–6
A weak front moves in from the west, bringing light rain to central areas. Rain expected across the south and west — including western Andalucía and Extremadura. Instability returns to the Mediterranean.

May 7–9
The most active period of the first half of the month. Multiple large storms forming inland, particularly in Castilla-La Mancha, Madrid and toward the Mediterranean. Locally strong storms possible. Mild showers continuing in the north.

May 13
A break — weather improves across the country.

May 14–17
Temperatures begin rising in central and southern areas. A cloud front arrives from the west, bringing rain to northern and central regions.

May 18–22
Rising temperatures in southern Spain. Weak but frequent inland storms, particularly in mountainous areas including the Central System and Iberian System. Continued instability along the Mediterranean.

May 23–27
A calmer spell. Stability returns nationwide, with moderate heat developing in southern areas.

May 28–31
Scattered isolated thunderstorms inland. Stability elsewhere to close the month.

Key Themes for May 2026

• Storms and instability dominate — particularly in central Spain, the Mediterranean, and mountainous inland areas throughout the month
• The north (Galicia, Cantabrian coast) bears the brunt of persistent rain, especially in the first week
• Heat builds in the south from mid-May, reaching moderate levels by late in the month — but no extreme heatwave is forecast
• The Mediterranean sees recurring instability across multiple periods
• The month ends on a broadly stable note, with only isolated inland storms

As always with cabanuelas forecasting, Rey's predictions offer a broad seasonal picture rather than the precision of short-range modelling. For day-to-day accuracy closer to the time, AEMET's official forecasts remain the definitive source — but for those planning a May trip to Spain or wondering what the month might hold, Rey's outlook gives a useful early read on the general pattern.

This article is based on reporting from Euro Weekly News, published April 30, 2026.