🇨🇿 Prague 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 Prague today is 3.2/10 — moderate exposure on a 0–10 scale where 10 is extreme. It reflects the worst of ten live hazard readings for Prague — 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 Prague
Prague's basin holds heat through dry continental spells, but nights typically fall further than in western Europe, preserving recovery. Its hazard is the occasional blocked pattern when warm nights persist and the city's stone fabric stays loaded.
Prague's basin holds its castle-and-spires core in a stone bowl the Vltava only partly ventilates: the dense historic districts — Old Town, Malá Strana, Žižkov's tenement slopes — store heat through dry continental spells, while the panelák estates on the plateau rim catch more wind but bake through their concrete. Nights usually rescue the city; the risk weeks are the blocked ones when they stop. Tourism concentrates thousands into the least shaded squares at the worst hours.
Heat and your health in Prague today
Feels-like maximum 20°C (air temperature 23°C) · tonight's minimum 15°C · humidity 39% · heat pillar score 0.0/10
Where today sits in Prague's year: the heat season here typically runs mid-June to late August, dry continental spells, peaking mid-July to mid-August. Tropical nights in Prague: occasional — mainly the dense centre during blocked 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 Prague drops to around 15°C, which gives the body a proper recovery window.
Pollen count in Prague today
Leading species: Mugwort at ~5 grains/m³ · pollen score 1.9/10
Prague's pollen calendar: Alder February–March · birch April · 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 Prague today: pollen × air quality
Combined pollen-and-air allergy load 2.2/10 — pollen 1.9 amplified by air quality (EAQI 32) · estimated from live data
Prague's birch April meets the Vltava basin's inversions — the same topography that traps winter smog holds spring pollen and traffic particulate at breathing height. Grass carries June; the basin's still days are the amplification mechanism.
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 Prague today
Maximum UV index 4.7 · moderate on the WHO scale
Prague'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 Prague today
European AQI 32 · fair (EAQI scale: 0 good → 100+ worst) · PM2.5 4.7 µg/m³ · ozone 84 µg/m³ · score 2.7/10
Prague's basin holds winter particle episodes under inversions — the historic smog pattern — while summer's issue is moderate ozone on hot, still days; storm fronts do the cleaning the topography refuses to.
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 Prague today
Fire-weather score 2.8/10 — 23°C, 39% humidity, wind to 12 km/h · estimated (weather conduciveness, not active fires)
The 2022 Bohemian Switzerland fire — the country's largest — burned sandstone-forest north of the city and pushed smoke far beyond the park. Pine on sandy ground is the regional fuel; Prague's score reads that readiness in dry summers.
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 Prague today
Hydration demand score 0.0/10 · estimated from live weather
Prague's dry spells evaporate sweat invisibly while the beer economy inverts incentives — cheaper than water and drunk accordingly: the tourist-day pattern of cobbled climbs plus pilsner needs a deliberate water schedule threaded through it.
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 Prague tonight
Mosquito activity score 2.7/10 — tonight around 15°C at 39% humidity · estimated from live weather (activity, not disease risk)
Mosquito season in Prague: June to August, riverside dusk, light. 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 Prague: where today sits
Flu-season level 0.9/10 · seasonal climatology (ECDC winter pattern), not live case counts
Flu in Prague runs December to February, peaking in January, moving through trams and metro in a compact, cold-winter city. Summer sits at the floor. The autumn campaign is standard advice for over-65s 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 Prague: the other end of the index
Cold-stress score 0.0/10 — tonight's minimum around 15°C
Prague winter is properly continental: grey weeks below zero, -10°C snaps, snow on the baroque roofs. The basin holds cold air as stubbornly as it holds smog. Heating is universal; January outdoor cold stress is real and the pillar shows it.
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 Prague climate-health year
The Bohemian year runs properly continental: cold winters with inversion smog echoes, an alder-birch spring, grass into July, and summers of dry 30°C-plus spells broken by storms riding up from the Alps. Recent years have pushed record runs past 37°C — hard numbers for a city with little residential cooling. Mugwort fills the late-summer allergy slot. September and early October deliver the stable golden weeks the city photographs best in.
| Season | Typical pattern in Prague |
|---|---|
| Heat season | mid-June to late August, dry continental spells |
| Peak heat | mid-July to mid-August |
| Tropical nights | Occasional — mainly the dense centre during blocked spells |
| Pollen calendar | Alder February–March · birch April · grass May–July · mugwort July–August |
| Mosquito season | June to August, riverside dusk, light |
| 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 Prague? What travellers should know
Prague's showpieces are shadeless at peak hours: the Charles Bridge and Old Town Square bake from late morning — walk them before 09:00, when they are also emptiest — and the castle climb earns real sweat in July; take tram 22 up and walk down. Cobbles radiate stored heat into the evening. Czech beer is cheaper than water and drunk accordingly, which on 34°C afternoons becomes a dehydration plan: alternate with actual water. The passages and arcades of the New Town cross the centre in near-permanent shade.
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 Prague 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 Czechia: 112 — EU-wide emergencies · 155 — ambulance · 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 Prague 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 Prague 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 Prague?
Today's Climate Health Score is 3.2/10 (Moderate). Elderly: low · Children: low · Outdoor workers: low · Athletes: low. No dominant environmental hazard today.
Will tonight be a tropical night in Prague?
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 Prague?
Typically mid-June to late August, dry continental spells, peaking mid-July to mid-August. Occasional — mainly the dense centre during blocked spells. Today's score at the top of this page reflects live conditions, not the seasonal average.
When is pollen season in Prague?
Alder February–March · birch April · 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 Prague?
June to August, riverside dusk, light. 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:
Prague 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, Prague Climate Health Index”, https://www.mobidoctor.eu/health-index/prague/ — updated daily, data CC-BY 4.0 with attribution.