Rain and storms in Illes Balears and Comunitat Valenciana, 9–10 September 2018

9 September 2018 to 10 September 2018. Updated 26 October 2026.

Over 2 days, 14 of Spain's 182 warning zones had an orange or red warning for rain and storms: 25 zone-days at orange or red, 0 of them red. The day with the most zones at orange or red was 9 September, with 13 zones.

9 September was the day with the most people in zones under an orange or red warning: 6 million people live there (INE municipal register, 2025).

How it compares

• It is number 104 of 119 episodes since June 2018 by zone-days at orange or red.
• Among the 35 rain episodes, it is number 32.
• Until then, no rain episode in the archive had been this widespread.

Day by day

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

The zones

And 86 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: 44.0 l/m² of rain in 24 h at Artà (Norte y nordeste de Mallorca) on 9 September; a 58 km/h gust at Alicante-Elche Aeropuerto (Litoral sur de Alicante) on 10 September.

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 orange warning reached 25 zone-days. AEMET issued it ahead of time in 24 of them (median: 11 h) and for the current hour in the other 1: warnings are also raised as things unfold. The first warning of any level for those same days had come a median 21 h earlier.

And 10 more zone-days.

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.

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