Calima and 34°C Heat Arrive in the Canary Islands This July

After a stretch of pleasantly mild weather, the Canary Islands are bracing for a classic mid-summer furnace. The state meteorological agency AEMET has confirmed that the cooler air mass is retreating, making way for a “notable ascenso de las temperaturas” starting Wednesday. This is not just a simple sunny spell; it is a combined event of blistering heat and a dense calima that will wrap the eastern islands in a warm, dusty embrace.

The regional government is already coordinating warnings. For Gran Canaria and Fuerteventura, official yellow-level heat alerts are in place, with thermometers expected to hit around 34 °C in the mid-altitude medianías of Gran Canaria and up to 35 °C in the interior south of Fuerteventura. The southern, eastern, and western slopes, along with the Tejeda basin, are pinpointed as the main hotspots. While the coast might offer a slight reprieve, the combination of extreme UV radiation and suspended dust makes this a tricky few days for everyone.

Where the heat hits hardest

This episode is not a uniform blanket of heat across all eight islands, but the focus is squarely on the east. Gran Canaria and Fuerteventura are taking the brunt, with Lanzarote also experiencing a significant dust load. In Gran Canaria, the southern tourist hubs and the elevated interior will feel the most oppressive heat, with maximum temperatures settling around 34 °C. Fuerteventura’s southern interior is expected to simmer at similar levels, potentially reaching 35 °C.

While Tenerife and La Gomera are also under regional government alerts for high temperatures on their exposed slopes and summits, the most intense combination of heat and calima will be felt in the eastern province. The official yellow warning from AEMET is active between 11:00 and 20:00, covering the hottest part of the day when the sun is at its most punishing. On top of the heat, the UV index forecast for all islands is classified as “extreme,” meaning unprotected skin can burn in a matter of minutes.

Not just heat: the calima factor

The heat is only half the story. A dense plume of Saharan dust is travelling with this air mass, creating a calima that will significantly reduce visibility and degrade air quality. The sky will take on that familiar milky, yellowish-grey hue, and a fine layer of dust will settle on everything. The Canary Islands Directorate General of Emergencies has issued pre-alert and yellow-level warnings for suspended dust, particularly for the eastern islands.

Air quality monitoring stations have shown that during such events, conditions can rapidly become “extremely unfavourable.” We are talking about particle concentrations—specifically PM10—climbing into the 50–200 µg/m³ range. To put that in perspective, levels above 50 µg/m³ are flagged as harmful for sensitive groups. In recent similar episodes, areas like Arrecife and Costa Teguise in Lanzarote, and the south and east of Gran Canaria, have recorded the worst air quality readings. This means the air you are breathing is not just hot; it is loaded with fine dust that can irritate your lungs and eyes.

Staying safe in the double assault

When extreme heat and poor air quality collide, the health advice becomes doubly important. The regional health authorities are clear: children, older adults, pregnant women, and anyone with asthma or chronic heart and lung conditions are especially vulnerable. The official guidance is to limit exposure, stay indoors as much as possible, and avoid physical exertion. This is not the week for that midday hike or a long beach run.

Hydration is your first line of defense. Authorities explicitly recommend “mantener una hidratación frecuente”—drink water regularly, even if you do not feel thirsty. Skip the extra beers and cocktails during the hottest hours and stick to water or light, non-alcoholic drinks. Protect your skin with high-SPF sunscreen, a wide-brimmed hat, and light, loose-fitting clothing. Seek shade or air-conditioned spaces between roughly 12:00 and 16:00, when the sun’s rays are most intense and the UV risk is at its peak.

To keep the dust out of your home, the classic calima drill applies: keep doors and windows tightly shut. If you have air conditioning, set it to recirculation mode so it does not pull in the dusty air from outside. A simple air purifier can also work wonders for indoor air quality. If you must drive, be prepared for reduced visibility, which can drop to around 3 kilometres in a thick calima. Slow down, increase your following distance, and use your low-beam headlights. And keep that windscreen washer fluid topped up—the dust will cake your glass quickly.

What to expect in the coming days

The shift begins on Wednesday, 15 July 2026, as the cooler air retreats and the mercury starts its climb. The peak of this heat and dust episode is expected to grip the islands through the latter half of the week. While exact hourly forecasts should be checked directly on AEMET’s official daily bulletin, the trend is unmistakable: hot, hazy, and uncomfortable. The eastern islands will be in the thick of it, with Gran Canaria’s southern half and Fuerteventura’s interior feeling the most intense heat.

This is a typical, albeit strong, mid-summer pattern for the Canaries. The archipelago’s proximity to the African coast means these blasts of hot, dusty air are a recurring feature of our climate. They usually last a few days before the trade winds reassert themselves and blow the haze away. For now, the best approach is to adapt your plans, look out for your neighbours, and respect the combined power of the sun and the dust. For non-urgent health questions, the Canary Islands information line 012 can provide local guidance. Stay cool, stay hydrated, and keep an eye on the sky.