🇳🇴 Oslo 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 Oslo today is 4.9/10 — moderate exposure on a 0–10 scale where 10 is extreme. It reflects the worst of ten live hazard readings for Oslo — 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 Oslo

Oslo's fjord-head basin can hold summer heat surprisingly well, and 2018-style dry spells showed weeks above 30 °C are possible at 60° north. Air conditioning is almost absent; risk lives in duration, not peaks.

Oslo climbs from a warm fjord head into forested hills, and that shape is its heat map: the bowl around the harbour and the dense inner districts — Grünerløkka, Tøyen — hold summer warmth the Marka's forests shed within minutes of the tram lines. Norwegian housing insulates magnificently in both directions: built to keep February out, it keeps July in, and cooling is almost nonexistent. The 2018 blocking summer proved weeks above 30°C are possible at 60° north.

Heat and your health in Oslo today

Feels-like maximum 20°C (air temperature 22°C) · tonight's minimum 13°C · humidity 51% · heat pillar score 0.0/10

Where today sits in Oslo's year: the heat season here typically runs late June to early August — blocked-pattern risk at 60° north, peaking mid-July, exceptional spells past 30°C. Tropical nights in Oslo: effectively absent.

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 Oslo drops to around 13°C, which gives the body a proper recovery window.

Pollen count in Oslo today

Leading species: Mugwort at ~19 grains/m³ · pollen score 4.9/10

Oslo's pollen calendar: Alder April · birch May, heavy · grass June–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 Oslo today: pollen × air quality

Combined pollen-and-air allergy load 4.4/10 — pollen 4.9 amplified by air quality (EAQI 24) · estimated from live data

Oslo's birch May is intense and brief, on fjord air that runs clean in summer — the allergy score is nearly a pure pollen reading, with grass carrying June and the season closing early.

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 Oslo today

Maximum UV index 4.4 · moderate on the WHO scale

Oslo's strong-UV season: May to July — midday index 5–6, long-daylight accumulation.

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 Oslo today

European AQI 24 · fair (EAQI scale: 0 good → 100+ worst) · PM2.5 2.8 µg/m³ · ozone 60 µg/m³ · score 1.9/10

Oslo's winter quirks are wood smoke and studded-tyre dust in the bowl; summer air runs clean off the fjord and forest, with ozone appearing only in the rare blocked heat spells.

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 Oslo today

Fire-weather score 1.4/10 — 22°C, 51% humidity, wind to 19 km/h · estimated (weather conduciveness, not active fires)

The 2018 blocking summer put Norwegian forests under fire warnings for weeks — the Marka's spruce and pine dry out in exactly those years. Oslo's score idles low otherwise; drought springs and summers are when it stirs.

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 Oslo today

Hydration demand score 0.0/10 · estimated from live weather

Oslo's fjord-and-forest days stack gentle exertion across enormous daylight: losses accrue on hikes and island hops that feel effortless in 24°C, and Norwegian tap water — excellent, free, everywhere — is the answer the city already provides.

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 Oslo tonight

Mosquito activity score 1.6/10 — tonight around 13°C at 51% humidity · estimated from live weather (activity, not disease risk)

Mosquito season in Oslo: June to August, forest-lake 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 Oslo: where today sits

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

Flu reaches Oslo December through February, peaking in January through the T-bane's winter crowds and a long indoor season. Summer sits at the floor. The autumn campaign covers over-65s and 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 Oslo: the other end of the index

Cold-stress score 0.0/10 — tonight's minimum around 13°C

Oslo winter is dry-cold continental for a coastal city: -10 to -15°C spells, reliable snow, fjord ice some years. Insulation is excellent and the culture winter-native; the pillar reads genuine cold-season stress, well buffered.

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 Oslo climate-health year

The Norwegian capital's year runs on light and water: dark ski-season winters, a fast birch-heavy spring in May, grass to July, and summers that normally alternate fjord-fresh 22°C days with the occasional continental push toward 30°C. Blocked years bring drought, forest-fire warnings and sustained heat the city has no tools for. The long June daylight stretches UV budgets invisibly. September closes the outdoor year with clear, cool weeks.

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

Visiting Oslo? What travellers should know

Oslo hands its cooling to you in two directions: the fjord — island-hopping ferries, the Sørenga sea pool, gradual entry into water that stays cold — and the Marka, where T-bane line 1 climbs to forest trails ten degrees cooler than the harbour. The Vigeland park and the opera roof are shadeless at midday; morning suits both. Hiking days follow mountain rules even here: water, layers, and note that Norwegian summer sun at altitude burns fair skin faster than the air temperature ever suggests.

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 Oslo 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 Norway: 112 — EU-wide emergencies · 113 — medical emergency · 116117 — legevakt · 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 Oslo 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 Oslo 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 Oslo?

Today's Climate Health Score is 4.9/10 (Moderate). Elderly: low · Children: low · Outdoor workers: low · Athletes: low. Led by mugwort pollen at moderate levels — no extreme single hazard today.

Will tonight be a tropical night in Oslo?

No — tonight drops to around 13°C, below the 20°C tropical-night threshold, giving the body a proper recovery window.

What pollen is high in Oslo right now?

Mugwort is the leading species at roughly 19 grains/m³ (pollen score 4.9/10). If you are sensitised, start antihistamines proactively and keep windows closed in the early morning and evening.

When is the heat season in Oslo?

Typically late June to early August — blocked-pattern risk at 60° north, peaking mid-July, exceptional spells past 30°C. Effectively absent. Today's score at the top of this page reflects live conditions, not the seasonal average.

When is pollen season in Oslo?

Alder April · birch May, heavy · grass June–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 Oslo?

June to August, forest-lake 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:

Oslo score history — last 30 days

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

Embed this live Oslo score

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