🇵🇱 Warsaw Climate Health Index
Saturday, 19 September 2026 · updated 15:30 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.
Cancer Immunology Researcher
The Climate Health Score for Warsaw today is 3.0/10 — moderate exposure on a 0–10 scale where 10 is extreme. It reflects the worst of ten live hazard readings for Warsaw — 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 Warsaw
Warsaw's continental summers are swinging harder: multi-day 30 °C-plus runs have lengthened notably while residential cooling remains rare. Heat arrives on a city whose housing and habits were shaped by cold winters, not hot summers.
Warsaw rebuilt itself twice over — meticulously old in the Old Town, monumentally socialist along its axes, and glass-corporate in Wola — and each layer heats differently: the reconstruction's stone lanes, the vast unshaded parade spaces around the Palace of Culture, and the new towers' reflective canyons. Residential cooling remains uncommon, and the city's heat spells land on housing and habits still calibrated for the cold half of the year. The Vistula's wild eastern bank is the accidental cooling reserve.
Heat and your health in Warsaw today
Feels-like maximum 19°C (air temperature 22°C) · tonight's minimum 15°C · humidity 43% · heat pillar score 0.0/10
Where today sits in Warsaw's year: the heat season here typically runs mid-June to late August, lengthening runs, peaking mid-July to mid-August, spikes past 35°C. Tropical nights in Warsaw: occasional in the dense centre during major runs.
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 Warsaw drops to around 15°C, which gives the body a proper recovery window.
Pollen count in Warsaw today
Leading species: Ragweed at ~1 grains/m³ · pollen score 0.5/10
Warsaw's pollen calendar: Alder February–March · birch April–May · grass May–July · mugwort July–August. 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 Warsaw today: pollen × air quality
Combined pollen-and-air allergy load 1.1/10 — pollen 0.5 amplified by air quality (EAQI 33) · estimated from live data
Warsaw's birch season is heavy — April's Polish birch bloom is among Europe's strongest — and the city's improving but still particulate-rich air does the priming. Grass follows into July on the plain's dry winds.
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 Warsaw today
Maximum UV index 4.3 · moderate on the WHO scale
Warsaw'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 Warsaw today
European AQI 33 · fair (EAQI scale: 0 good → 100+ worst) · PM2.5 8 µg/m³ · ozone 86 µg/m³ · score 2.8/10
Warsaw carries Poland's coal legacy in winter, when heating particles climb across the plain; summer air is usually reasonable, with ozone spells during the hot runs — the season the readings above describe.
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 Warsaw today
Fire-weather score 2.0/10 — 22°C, 43% humidity, wind to 13 km/h · estimated (weather conduciveness, not active fires)
Mazovia's pine plantations and spring grass-burning give Warsaw a two-season fire signal: April's field fires and high-summer forest readiness. Smoke haze reaches the city occasionally; the score tracks the plain's dryness.
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 Warsaw today
Hydration demand score 0.0/10 · estimated from live weather
Warsaw's lengthening hot runs meet a cold-country baseline: few habits, little shade on the monumental axes, and long walking distances — the city's summer water-distribution points during heat alerts exist because the deficit pattern is real.
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 Warsaw tonight
Mosquito activity score 2.8/10 — tonight around 15°C at 43% humidity · estimated from live weather (activity, not disease risk)
Mosquito season in Warsaw: June to August, Vistula-side dusk. 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 Warsaw: where today sits
Flu-season level 0.9/10 · seasonal climatology (ECDC winter pattern), not live case counts
Flu crosses Warsaw December through February, peaking in January through a real continental winter that keeps the city indoors for months. Summer sits at the floor. The autumn campaign is standard advice for seniors 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 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 Warsaw: the other end of the index
Cold-stress score 0.0/10 — tonight's minimum around 15°C
Warsaw winter is the real thing: extended freezes, -15°C snaps in bad years, snow cover that stays. District heating is universal and the winter culture deep. The pillar peaks properly here — outdoor cold stress is a season, not an episode.
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 Warsaw climate-health year
The Mazovian year swings hard: genuinely cold winters, an alder-birch spring, grass to July, mugwort into August — and summers whose 30°C-plus runs have lengthened conspicuously, with spikes past 35°C now regular. Dry continental spells alternate with humid Atlantic pushes; nights mostly cool, but the dense districts hold warmth in the worst runs. September remains reliably pleasant — the month Warsaw's parks were made for.
| Season | Typical pattern in Warsaw |
|---|---|
| Heat season | mid-June to late August, lengthening runs |
| Peak heat | mid-July to mid-August, spikes past 35°C |
| Tropical nights | Occasional in the dense centre during major runs |
| Pollen calendar | Alder February–March · birch April–May · grass May–July · mugwort July–August |
| Mosquito season | June to August, Vistula-side dusk |
| Strong-UV months | May to August — midday index 6–7 |
Typical seasonal patterns from established climatology — the live scores above always reflect today's actual conditions.
Visiting Warsaw? What travellers should know
Warsaw's distances deceive: Old Town to Łazienki to the Palace of Culture is a full day of exposed walking — use the (air-conditioned) metro's two lines as your spine and treat Łazienki's deep shade as the afternoon anchor. The Old Town's reconstruction is stone underfoot and sun overhead by noon; mornings suit it. The Vistula boulevards give an evening breeze the street grid blocks. Museum afternoons — POLIN and the Warsaw Rising Museum both run cool — map neatly onto the hottest hours.
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 Warsaw 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:
ACall 112 now — emergency signs
- Confusion, slurred speech, or disorientation; a seizure; or fainting that doesn't resolve within a minute or two
- Skin that has turned hot and dry after earlier heavy sweating, or a body temperature of 40 °C or more — signs of heatstroke
- Chest pain, severe shortness of breath, or a racing pulse that doesn't settle with rest in the cool
- Heat-exhaustion symptoms — dizziness, headache, nausea, cramps, pale clammy skin — that are no better after 30 minutes of rest, cooling and fluids: this can be heatstroke developing
- A baby, elderly person, or someone with heart disease who becomes limp, unresponsive, or "not themselves" in the heat
While waiting: move them to the coolest place available, remove excess clothing, cool the skin with water and moving air, and do not give fluids to anyone who is drowsy or confused.
BSpeak to a doctor today
- Heat symptoms that improve with cooling but keep returning on hot days, or leave you washed out for more than a day
- Repeated vomiting, or very dark urine / almost no urination through the day
- You take diuretics, blood-pressure, heart, or diabetes medication and feel unwell in the heat — some of these medicines change how your body handles fluid and temperature
- You are pregnant, or you have a heart or kidney condition that feels worse than usual in this weather
CSelf-care and recheck in 30 minutes
- Mild headache, tiredness, or thirst: move somewhere cool, remove unnecessary clothing, drink plenty of water or an isotonic sports drink, and cool the skin — spray or sponge with cool water and fan
- Recheck at 30 minutes. Improving means continue resting out of the heat for the rest of the day. Not improving is an emergency — call 112 (tier A), not a wait-and-see
Local numbers in Poland: 112 — EU-wide emergencies · 800 190 590 — NFZ patient line · 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 Warsaw 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 Warsaw 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 Warsaw?
Today's Climate Health Score is 3.0/10 (Moderate). Elderly: low · Children: low · Outdoor workers: low · Athletes: low. No dominant environmental hazard today.
Will tonight be a tropical night in Warsaw?
No — tonight drops to around 15°C, below the 20°C tropical-night threshold, giving the body a proper recovery window.
When is the heat season in Warsaw?
Typically mid-June to late August, lengthening runs, peaking mid-July to mid-August, spikes past 35°C. Occasional in the dense centre during major runs. Today's score at the top of this page reflects live conditions, not the seasonal average.
When is pollen season in Warsaw?
Alder February–March · birch April–May · grass May–July · mugwort July–August. 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 Warsaw?
June to August, Vistula-side dusk. 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:
Warsaw 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, Warsaw Climate Health Index”, https://www.mobidoctor.eu/health-index/warsaw/ — updated daily, data CC-BY 4.0 with attribution.