🇵🇹 Lisbon Climate Health Index

Tuesday, 3 November 2026 · updated 16:30 UTC · refreshes live through the day · LIVE

Modelled estimates · Medically reviewed guidance · Not an official warning service

^est. = index derived by Mobi Doctor's model from the weather inputs. All values are modelled estimates from European weather and atmospheric forecast systems (Open-Meteo · CAMS/Copernicus) — not direct readings from a monitoring station in this city, and not official public-health warnings.

The Climate Health Score for Lisbon today is 2.5/10 — low exposure on a 0–10 scale where 10 is extreme. It reflects the worst of ten live hazard readings for Lisbon — heat, UV, air quality, pollen, hydration demand, allergy, mosquito activity, fire weather, flu season and cold — and is recalculated through the day by Mobi Doctor's European Climate Health Index.

How heat behaves in Lisbon

Lisbon lives on Atlantic moderation — until an African air mass overrides it, when records near 44 °C show how violently this city can spike. Housing built for mild weather, with little air conditioning, turns those short episodes into significant indoor heat events.

Lisbon's seven hills sort its microclimates: the river-facing slopes of Alfama and the Baixa grid absorb full southern sun, the ridge-top miradouro districts catch the Atlantic breeze, and the tile-fronted housing everywhere was built for mild weather — minimal insulation, minimal cooling — which is why the city's rare heat spikes become indoor events. The most exposed are older residents in top-floor walk-ups of the historic bairros, where 40°C outside can mean a week above 30°C inside.

Heat and your health in Lisbon today

Feels-like maximum 20°C (air temperature 23°C) · tonight's minimum 9°C · humidity 35% · heat pillar score 0.0/10

Where today sits in Lisbon's year: the heat season here typically runs June to September, mostly moderate with violent short spikes, peaking late July to mid-August — spike days can approach the low 40s. Tropical nights in Lisbon: uncommon — mainly during African-air episodes, when the compact centre holds the heat.

Heat stresses the body long before heatstroke. As the air temperature and humidity climb, your heart works harder to push blood to the skin for cooling, you lose fluid and electrolytes through sweat, and blood pressure can dip when you stand. That is why hot days bring more dizziness, fainting, migraines, kidney strain and falls — and studies of heatwave hospital admissions also report more urinary tract infections, thought to be linked to dehydration — not just classic heat exhaustion.

Night temperature matters as much as the daytime peak. When a night stays above 20°C — a tropical night — the cardiovascular system gets far less of its overnight recovery window — one reason heatwave mortality tracks hot nights more closely than hot afternoons. Tonight in Lisbon drops to around 9°C, which gives the body a proper recovery window.

Pollen count in Lisbon today

Pollen levels are currently minimal · score 0.0/10

Lisbon's pollen calendar: Grass April–June · olive May–June · plane in early spring. The live counts above show where today falls in that cycle.

Pollen allergy (hay fever) is triggered by different plants through the year: trees like birch and alder in spring, grasses in early summer, and weeds such as mugwort and ragweed from late July into autumn. Symptoms — sneezing, itchy eyes, a blocked nose, worsened asthma — flare when daily counts cross species-specific thresholds, and air pollution makes the same pollen load feel worse by priming the airways.

On high-count days: keep windows closed in the early morning and evening, shower and change after time outdoors, and start antihistamines before symptoms peak rather than after. If you use an asthma inhaler, keep it with you on high pollen days.

Allergy load in Lisbon today: pollen × air quality

Combined pollen-and-air allergy load 0.6/10 — pollen 0.0 amplified by air quality (EAQI 27) · estimated from live data

Lisbon's grass season peaks May to June on Atlantic air that is usually clean, so the pollution multiplier matters less here than in most capitals — the allergy score tends to track pollen nearly alone, spiking on the dry easterly days when both climb together.

Allergy risk is more than the pollen count. Exhaust particles damage the airway lining and prime the immune response, so the same grains provoke stronger symptoms on polluted days — and pollutant-stressed plants release more allergenic protein per grain. This combined score therefore reads pollen and air quality together: identical counts can feel very different on clean and dirty days, which is why it is tracked as its own pillar rather than folded into either input.

Today the combination is modest — sensitised people can treat this as a normal day, with the usual seasonal routine.

UV index in Lisbon today

Maximum UV index 3.9 · moderate on the WHO scale

Lisbon's strong-UV season: April to September — midday index 9–10 under clear Atlantic skies.

UV radiation peaks between late morning and mid-afternoon and is invisible — it burns on cool, cloudy days too. At UV 8 and above, unprotected fair skin can burn in under 30 minutes. Repeated burns drive most skin-cancer risk, and some common medicines (certain antibiotics, diuretics, acne treatments) make skin dramatically more sun-sensitive.

Sun protection is low-priority today, but sunscreen remains sensible for extended time outdoors.

Air quality in Lisbon today

European AQI 27 · fair (EAQI scale: 0 good → 100+ worst) · PM2.5 7.1 µg/m³ · ozone 72 µg/m³ · score 2.2/10

Lisbon's Atlantic wind does most of the cleaning; the exceptions are hot easterly days, when interior air brings ozone and occasionally dust, and the river basin holds traffic exhaust that the breeze normally sweeps away.

Fine particles (PM2.5) reach deep into the lungs and bloodstream; ozone forms in sunny, hot weather and irritates the airways — which is why heatwaves and smog often arrive together. People with asthma, COPD, heart disease, pregnant women and children feel the effects first: more wheeze, more inhaler use, more chest tightness.

Levels are acceptable for outdoor activity today for most people, including sensitive groups.

Fire weather around Lisbon today

Fire-weather score 3.4/10 — 23°C, 35% humidity, wind to 8 km/h · estimated (weather conduciveness, not active fires)

Portugal is Western Europe's most fire-prone country, and smoke from central-country burns — the tragic 2017 season above all — has reached the capital more than once. Lisbon's own hills carry little fuel; the score mostly reads the national tinder-state.

This pillar scores how conducive the weather is to wildfire — heat, dry air and wind, the published Angström approach — not actual fires. Its health meaning is smoke: wildfire smoke is concentrated fine particulate that can travel hundreds of kilometres, and a smoke episode hits the same people hardest as any pollution spike — asthma, COPD, heart disease, pregnancy, young children and older adults.

Conditions are not notably fire-conducive today. If you see or smell smoke regardless, treat it like a pollution episode: head indoors, close the windows, and postpone outdoor exertion.

Hydration in Lisbon today

Hydration demand score 0.0/10 · estimated from live weather

Lisbon's breeze and mild readings disguise the workload: the hills make every sightseeing day an exercise session, and on the rare interior-wind spike days the air dries abruptly and losses jump before habits adjust.

Fluid needs are not fixed — they scale with heat, humidity, dry air, UV and activity. Thirst lags behind need, especially in older adults, whose thirst signal weakens with age. Dark urine, headache, and light-headedness on standing are earlier and more reliable signals.

Today's guidance: Normal — drink to thirst; keep water with you on long outings.

Mosquito activity in Lisbon tonight

Mosquito activity score 0.5/10 — tonight around 9°C at 35% humidity · estimated from live weather (activity, not disease risk)

Mosquito season in Lisbon: June to September, a modest dusk season. The score above places tonight inside that season using live temperature and humidity.

Mosquitoes fly when nights are warm and humid enough — activity climbs steeply once evenings hold above about 15°C and peaks on still, muggy nights. Southern Europe adds the tiger mosquito, a day-biter now established across much of the Mediterranean, whose continued spread north ECDC tracks. In parts of southern and central Europe, late summer also brings limited local transmission of mosquito-borne infections such as West Nile virus — an activity score is not a disease-risk score, but high-activity weeks are when precautions earn their keep.

Practical: use a repellent containing DEET or icaridin at dusk, cover ankles and wrists outdoors in the evening, screen or close windows at night, and empty standing water on balconies weekly. Speak to a doctor about any fever that develops in the week after heavy bite exposure in an affected region.

Flu season in Lisbon: where today sits

Flu-season level 2.8/10 · seasonal climatology (ECDC winter pattern), not live case counts

Flu in Lisbon builds through December to a January peak, meeting a health system that feels every winter wave. Summer sits at the seasonal floor. Autumn vaccination — October onward — is the standing advice for older residents and chronic patients.

Influenza in Europe is sharply seasonal: transmission runs low through summer, builds from late autumn as life moves indoors and cool, dry air favours the virus, then peaks between December and February in ECDC's surveillance pattern. This pillar follows that climatology — it tells you where the calendar sits, not this week's case counts, and we label it that way rather than dress a seasonal curve up as live surveillance.

What to do with it: the score rising through autumn is the cue that vaccination time has arrived — October to November gives antibodies time to build before the peak, and matters most for over-65s, pregnant women, young children and anyone with heart, lung, kidney or immune conditions. At today's level, fever with aches and a cough deserves rest, fluids and distance from vulnerable relatives.

Cold stress in Lisbon: the other end of the index

Cold-stress score 0.5/10 — tonight's minimum around 9°C

Lisbon's winter paradox is indoor: mild 8–10°C Atlantic nights meet a housing stock with famously little heating and insulation, and Portugal records some of Europe's highest excess winter mortality as a result. The pillar reads outdoor cold; the real exposure is the unheated flat.

Across Europe, cold claims more lives each year than heat — mostly quietly, through winter's extra heart attacks, strokes and respiratory infections rather than hypothermia. Cold air raises blood pressure and thickens blood within minutes, narrows airways, and stresses hearts hardest in the first snaps of the season, before bodies and habits adjust. Indoor cold in poorly heated homes does as much damage as the weather outside.

Cold is not a factor today — the score sits low, and this pillar will matter again when the season turns. It stays on the page year-round because an honest index needs both ends of the thermometer.

The Lisbon climate-health year

Most of Lisbon's year is Atlantic moderation: long mild springs, breezy 26–30°C summers, soft autumns. The health story concentrates in two interruptions — grass and olive pollen from April to June, riding in from the interior, and the handful of days most summers when African air overrides the ocean and the city jumps 10–15 degrees in 48 hours toward records near 44°C. Those spikes, brief but violent on an unaccustomed population, are Lisbon's defining heat risk.

Typical seasonal patterns from established climatology — the live scores above always reflect today's actual conditions.

Visiting Lisbon? What travellers should know

Lisbon is a stair-climbing city that disguises exertion as sightseeing: the Alfama and Bairro Alto climbs, the exposed river front at Belém and the queue outside the Jerónimos all add up in full sun, and the Atlantic breeze keeps skin cool while UV 9 does its work. Use the trams and funiculars uphill and walk down. On the rare announced heat-spike days, do what locals do — the ocean beaches at Cascais or Caparica are typically eight degrees cooler than the Baixa.

If you do get ill away from home, you don't have to navigate a foreign health system for something a consultation can solve: speak to a Mobi Doctor physician online from your hotel or apartment.

Medicines in Lisbon this week

Temperatures are currently inside normal storage ranges. Standard advice applies: keep medicines below 25°C, out of direct sun, and never in a parked vehicle.

Should I speak to a doctor about heat symptoms?

Heat illness escalates in stages, and the right response depends on which stage you're seeing. Use these three tiers:

Local numbers in Portugal: 112 — EU-wide emergencies · SNS 24 — 808 24 24 24 · for non-urgent concerns, a Mobi Doctor physician is online in minutes.

General guidance, not a personal assessment — when in doubt, call. In an emergency always call 112.

Sources for the medical guidance

The clinical guidance on this page follows public authority sources:

Medication storage limits follow each product's manufacturer information (SmPC / patient leaflet) — always defer to the leaflet for your specific product, and to your prescriber for personal advice.

Frequently asked questions

Is it safe to exercise outdoors in Lisbon today?

Yes — heat is not a limiting factor today (heat score 0.0/10). Usual sun protection applies.

Do I need to worry about storing insulin or Ozempic in Lisbon this week?

Standard rules apply this week: unopened stock in the fridge at 2–8°C, in-use pens below 30°C away from direct sun.

Who is most at risk from today's conditions in Lisbon?

Today's Climate Health Score is 2.5/10 (Low). Elderly: low · Children: low · Outdoor workers: low · Athletes: low. No dominant environmental hazard today.

Will tonight be a tropical night in Lisbon?

No — tonight drops to around 9°C, below the 20°C tropical-night threshold, giving the body a proper recovery window.

When is the heat season in Lisbon?

Typically June to September, mostly moderate with violent short spikes, peaking late July to mid-August — spike days can approach the low 40s. Uncommon — mainly during African-air episodes, when the compact centre holds the heat. Today's score at the top of this page reflects live conditions, not the seasonal average.

When is pollen season in Lisbon?

Grass April–June · olive May–June · plane in early spring. This page tracks live counts for six species (alder, birch, grass, mugwort, olive and ragweed) and updates them through the day.

When is mosquito season in Lisbon?

June to September, a modest dusk season. The live mosquito-activity score on this page places tonight inside that season using temperature and humidity — it measures activity conditions, not disease risk.

Highest-risk cities in Europe today

All cities:

Lisbon score history — last 30 days

One point per day, refreshed by the daily rebuild. Full archive downloads in the press room.

Embed this live Lisbon score

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Cite this page: “Mobi Doctor — European Climate Health Index, Lisbon Climate Health Index”, https://www.mobidoctor.eu/health-index/lisbon/ — updated daily, data CC-BY 4.0 with attribution.