Maximum temperature, NWS heat index, humidex and 7-day forecast for Santa Cruz de Tenerife and the rest of Canary Islands. AEMET regional record: 44.1 °C (Tias (Lanzarote), August 2023).
| Day | T max | Feels-like max | Over threshold |
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Real-time Open-Meteo data.
Canary Islands is one of the Spanish regions where summer heat reaches critical levels during June, July and August. The official AEMET record for the region is 44.1 °C (Tias (Lanzarote), August 2023). The number of days above 35 °C has increased measurably over the past two decades, partly due to global warming and partly to the urban heat island effect in major cities.
The feels-like temperature, computed with the NWS Heat Index or the Canadian Humidex, typically exceeds the dry-bulb value by 3-8 degrees when humidity rises above 50%. In coastal areas this is the norm; inland, the most dangerous factor is persistent tropical nights (above 20 °C) that prevent physiological recovery.
People over 65, those with chronic cardiac or respiratory conditions, pregnant women and small children are the most vulnerable groups. Use municipal cooling centres (libraries, community centres, air-conditioned shopping malls) during the central hours of the day. Stay hydrated and watch for headaches, nausea and absent sweating. Dial 112 for any suspected heat stroke anywhere in Canary Islands.
The 7-day forecast box shows expected highs and maximum feels-like temperatures for Santa Cruz de Tenerife. A run of more than 5 days with feels-like values above 35 °C is flagged as a probable heatwave, based on our simplified version of the AEMET rule (3 days above the 95th percentile of historical summer highs). The map shows current-day highs for Canary Islands. Check official AEMET warnings at aemet.es.
The Canaries have two summers. The usual one is governed by the trade winds, which keep temperatures remarkably steady all year. The other arrives with the calima: when Saharan air crosses a thousand kilometres of ocean and overrides the trades, the thermometer climbs ten degrees in a few hours, the humidity collapses and suspended dust cuts visibility. It is only a few days a year, but they are the ones that count.
35 °C does not mean the same thing in Córdoba as in Santander, so a fixed number is the wrong place to start. Taking Santa Cruz de Tenerife as the reference point, the extreme-heat threshold specific to this place — the 95th percentile of July and August maxima, which is the criterion AEMET uses — sits at 25.2 °C, well down the national range, as you would expect where the sea is never far away. It is exceeded on about 5 days a year.
In absolute terms that is 0 days a year at 35 °C or above and 0.0 at 40 °C or above, with a mean August maximum of 23.2 °C. The nights count as much as the days: there are 65 nights a year when the temperature does not drop below 20 °C, though 25 is virtually never held.
That is the question that matters most, and the series answers it on its own. In Santa Cruz de Tenerife, days above that 25.2 °C threshold went from 3.3 a year on average in 1995-2004 to 7.9 in 2015-2024. The gap is large and points one way only: 5 more days a year above the threshold, 139 % more than thirty years ago. Nights that do not drop below 20 °C have made the same journey: from 56 to 77 a year.
There is no universal number: 35 °C is an anomaly in Santander and an ordinary July afternoon in Córdoba. So the definition is built from each place’s own record. Applying AEMET’s criterion — three consecutive days above the 95th percentile of July and August maxima — that threshold in Santa Cruz de Tenerife stands at 25.2 °C, and across 30 years of record 20 episodes have occurred. The longest ran 16 days in a row. The hottest day in the whole series was 30 July 2007, at 29.5 °C.
Of the 17 regions with a page on this site, the Canary Islands have the lowest extreme-heat threshold in the country (25.2 °C) and ranks 3rd for days a year above it. For tropical nights it ranks 4th. For scale, the highest in the country is Seville at 40.0 °C.
On how fast it is worsening it ranks 7th of 17. That is the figure worth watching rather than the threshold itself: the starting point depends on each place’s climate, but the increase can be compared across all of them.
From ERA5-Land, the reanalysis produced by the European Centre for Medium-Range Weather Forecasts, downloaded from the Copernicus Climate Data Store under a CC-BY licence: hourly temperature between 1995-01-01 and 2024-12-06, 30 complete years, taken at the 28.50°, -16.30° cell, the closest to Santa Cruz de Tenerife. ERA5-Land runs on a grid of about 9 km and covers land only, which keeps the sea from cooling the figure in coastal cities.
One caveat that changes how all of this should be read: a reanalysis is not a weather station. It smooths the terrain and cannot see a city’s heat island, so its absolute extremes fall short of what AEMET measures at a specific observatory: here the highest value in the series is 29.5 °C. That is why the figure that governs this page is not a fixed threshold but the one specific to this place, and why the real value lies not in the record but in the comparison between decades: the series is long, homogeneous and without gaps, and there a reanalysis beats any station that has changed site or instrument along the way.
