🇳🇱 Rotterdam Climate Health Index

Friday, 7 August 2026 · updated 10:33 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 Rotterdam today is 4.0/10 — moderate exposure on a 0–10 scale where 10 is extreme. It reflects the worst of ten live hazard readings for Rotterdam — 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 Rotterdam

Rotterdam shares Amsterdam's maritime moderation with a denser, more modern urban core that heats strongly: extensive concrete and glass, port industry, and rising humid spikes. Its modern buildings ventilate poorly without mechanical cooling.

Rotterdam is the Netherlands' concrete experiment: rebuilt after 1940 in glass, steel and hard surface, with a dense high-rise core that heats faster and cools slower than the brick cities around it. The port's industrial belt adds its own microclimate and air-quality load. The city's modern flats ventilate poorly without mechanical help that mostly is not there, and its comparatively young population masks pockets of concentrated vulnerability in the older northern and southern districts.

Heat and your health in Rotterdam today

Feels-like maximum 21°C (air temperature 23°C) · tonight's minimum 16°C · humidity 41% · heat pillar score 0.0/10

Where today sits in Rotterdam's year: the heat season here typically runs mid-June to mid-August — urban spikes on a maritime baseline, peaking mid-July to early August. Tropical nights in Rotterdam: rare, concentrated in the high-rise core during strong spells.

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 Rotterdam drops to around 16°C, which gives the body a proper recovery window.

Pollen count in Rotterdam today

Leading species: Mugwort at ~8 grains/m³ · pollen score 2.7/10

Rotterdam's pollen calendar: Alder February–March · birch April · grass May–July. 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 Rotterdam today: pollen × air quality

Combined pollen-and-air allergy load 2.5/10 — pollen 2.7 amplified by air quality (EAQI 20) · estimated from live data

Rotterdam pairs April birch and June grass with Europe's largest port — industrial and shipping particulate gives spring pollen a sharper edge here than the polder setting suggests. West winds ventilate; easterly stagnation builds the combination.

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 Rotterdam today

Maximum UV index 5.5 · moderate on the WHO scale

Rotterdam's strong-UV season: May to August — midday index 6–7.

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 Rotterdam today

European AQI 20 · fair (EAQI scale: 0 good → 100+ worst) · PM2.5 5.7 µg/m³ · ozone 49 µg/m³ · score 1.5/10

Rotterdam hosts Europe's largest port and its refinery cluster: shipping and industry set an air baseline unusual for a city this size, and easterly stagnation days hold the industrial plume over the centre.

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 Rotterdam today

Fire-weather score 2.7/10 — 23°C, 41% humidity, wind to 12 km/h · estimated (weather conduciveness, not active fires)

Little burns in the delta: dune strips and heath patches at most, in exceptional dry springs. Rotterdam's fire-weather score idles low, and its practical smoke exposure is industrial rather than wildland.

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 Rotterdam today

Hydration demand score 0.0/10 · estimated from live weather

Rotterdam's hard modern surfaces radiate heat back through humid spells, and the harbour wind dries you on days that feel too cool to matter — both patterns under-announce fluid loss; the city's fountains and tap culture make repayment easy.

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 Rotterdam tonight

Mosquito activity score 3.3/10 — tonight around 16°C at 41% humidity · estimated from live weather (activity, not disease risk)

Mosquito season in Rotterdam: June to September, moderate. 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 Rotterdam: where today sits

Flu-season level 0.5/10 · seasonal climatology (ECDC winter pattern), not live case counts

Flu in Rotterdam runs December to February, peaking in January in a city that commutes by metro, tram and bike through raw maritime winter. Summer sits at the floor. The autumn vaccination round from October is the standing advice for risk groups.

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 low seasonal level, a summer fever is far more likely to be something other than flu — and worth a doctor's opinion if it lasts.

Cold stress in Rotterdam: the other end of the index

Cold-stress score 0.0/10 — tonight's minimum around 16°C

Rotterdam winter is wind: North Sea blasts drive chill through the high-rise canyons and across the exposed Maas, making 3°C feel far colder. Freezes are moderate, snow modest. Modern housing heats well; wind-chill on foot and bike is the real exposure.

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 Rotterdam climate-health year

Rotterdam shares the Dutch maritime calendar — alder and birch spring, grass to July, mild changeable summers — but its rebuilt fabric amplifies the warm end: spike days run hotter downtown than in the surrounding polder, and the hard-surfaced centre holds evening warmth the canals of older cities would moderate. The Maas brings ventilation the high-rises then interrupt. Winters are mild, windy and wet, with the port's air quality a year-round background factor.

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

Visiting Rotterdam? What travellers should know

Rotterdam's architecture tour is a hard-surface circuit: the Markthal, cube houses, Erasmus Bridge and Wilhelminapier offer almost no natural shade between them, and the reflective modern facades push radiant heat back at street level. Time the outdoor architecture for morning, use the (well-cooled) museums and food halls for the afternoon, and note the water taxis as the breeziest way to cross the city. On hot evenings the rooftop bars catch wind the streets below never feel.

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 Rotterdam 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 Netherlands: 112 — EU-wide emergencies · huisartsenpost via your GP’s number (out of hours) · 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 Rotterdam 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 Rotterdam 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 Rotterdam?

Today's Climate Health Score is 4.0/10 (Moderate). Elderly: low · Children: low · Outdoor workers: low · Athletes: low. Led by UV at moderate levels — no extreme single hazard today.

Will tonight be a tropical night in Rotterdam?

No — tonight drops to around 16°C, below the 20°C tropical-night threshold, giving the body a proper recovery window.

When is the heat season in Rotterdam?

Typically mid-June to mid-August — urban spikes on a maritime baseline, peaking mid-July to early August. Rare, concentrated in the high-rise core during strong spells. Today's score at the top of this page reflects live conditions, not the seasonal average.

When is pollen season in Rotterdam?

Alder February–March · birch April · grass May–July. 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 Rotterdam?

June to September, moderate. 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:

Rotterdam score history — last 30 days

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

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