Rain and storms across much of Spain, 29 August – 2 September 2021

29 August 2021 to 2 September 2021. Updated 26 October 2026.

Over 5 days, 56 of Spain's 182 warning zones had an orange or red warning for rain and storms: 81 zone-days at orange or red, 1 of them red. The day with the most zones at orange or red was 1 September, with 34 zones.

1 September was the day with the most people in zones under an orange or red warning: 13.7 million people live there (INE municipal register, 2025).

How it compares

• It is number 44 of 119 episodes since June 2018 by zone-days at orange or red.
• Among the 35 rain episodes, it is number 7.
• There hadn't been a rain episode this widespread since September 2019.

Day by day

Zones with a warning each day, at their highest level that day.

The zones

And 81 more zones with yellow warnings only.

What AEMET's stations measured

The most measured in the zones with an orange or red warning, on their warning days: 95.2 l/m² of rain in 24 h at Daroca (Ibérica zaragozana) on 1 September; a 87 km/h gust at La Pinilla, Estación de Esquí (Sistema Central de Segovia) on 1 September.

And 34 more zones with an orange or red warning.

* Zone with no AEMET station: the value is from the nearest one, outside the zone.

For each zone, the highest value its AEMET stations measured on the episode's warning days (the lowest, for the low temperature), with the station and the day. Rain from 07:00 to 07:00 UTC; gust: the day's strongest. It is what the zone's stations measured, not every town, and a measurement, like a warning, is not damage.

How AEMET's warnings unfolded

The red warning reached 1 zone-days, and AEMET always issued it for the current hour: warnings are also raised as things unfold. The first warning of any level for those same days had come a median 47 h earlier.

AEMET's issue times, in mainland Spain time (Canary Islands in island time). Notice is the time from issue to the first hour the warning covered; a warning issued “for the current hour” runs from the hour it is published.

What this says and what it doesn't

A warning is an AEMET forecast, not a measurement or a damage report: it says a threshold is expected to be exceeded in a zone. A warning is not damage; a zone is not a building.

A zone-day is one warning zone with a warning on one day. Ten zones at orange on the same day make ten zone-days. A day with several warnings in one zone counts once, at its highest level.

Each zone has its own thresholds, so an orange heat warning in Asturias doesn't mean the same temperature as in Córdoba. More in how warnings work.

To cite: “Climaviso, from AEMET warnings”.

Source: official AEMET warnings, collected by Climaviso since June 2018.

← Previous episode · All episodes · Next episode → · 2021 warnings review