Pollen Forecast Lisbon — August 17, 2026
Live pollen levels for hay fever and allergy sufferers in Lisbon, Portugal
Today's Pollen Levels in Lisbon
Today's Forecast Conditions
Pollen is present but at low levels in Lisbon on August 17, 2026. The majority of hay fever sufferers should manage well without medication.
Outdoor activities are generally fine today. Mildly sensitive individuals may notice light symptoms in the afternoon as temperatures rise. Keep antihistamines handy if you react to very low thresholds.
7-Day Pollen Forecast for Lisbon
Pollen Season in Lisbon
Lisbon's pollen season benefits from Atlantic influence but is shaped by the dry Mediterranean conditions of the Tagus estuary and the Alentejo plateau to the south. The season starts earlier than in northern Europe — grasses begin pollenating from February in the Setúbal Peninsula and the hill ranges east of the city. Olive trees are a major allergen source unique to Lisbon and the broader Portuguese landscape, with the olive season peaking in May across the Alentejo and contributing to urban counts. Plane trees, widely planted along Lisbon's avenidas, also contribute. Grass pollen from the Serra da Arrábida and the Ribatejo plains peaks in April and May. Lisbon's Atlantic position means sea breezes frequently suppress afternoon counts and provide relief compared to inland cities. The season typically ends by June, giving Lisbon a shorter but front-loaded allergy calendar.
- Lisbon's season peaks in April and May — earlier than northern Europe, so visitors from the UK or Scandinavia may be caught off-guard without medication.
- Olive pollen is specific to southern Europe; if you have symptoms in Lisbon but not at home, olive sensitisation is worth investigating.
- Atlantic sea breezes typically arrive by mid-afternoon and suppress pollen — morning hours are consistently the worst for outdoor activities.
Frequently Asked Questions
What is the pollen count in Lisbon today?
Today, August 17, 2026, the dominant pollen in Lisbon is Grass at Low levels. The maximum recorded value is 5.2 grains/m³. PollenPal updates this data daily.
When is hay fever season in Lisbon?
The main hay fever season in Lisbon runs from March to May. Tree pollens (birch, alder) typically start the season, followed by grass pollen which is the most common allergen trigger. Mugwort and other weeds can extend symptoms into late summer.
What pollen is high in Lisbon right now?
As of August 17, 2026, the highest pollen type in Lisbon is Grass (Low). You can track all four pollen types — birch, grass, alder, and mugwort — on this page, updated every day.
Is birch pollen high in Lisbon today?
Birch pollen in Lisbon today (August 17, 2026) is at Low levels (0.0 grains/m³). Birch season in Lisbon typically peaks in spring. For personalised birch pollen alerts, download the PollenPal app.
How do I reduce hay fever symptoms in Lisbon?
To reduce hay fever symptoms in Lisbon: check the daily pollen forecast and take antihistamines before heading outside on high-count days. Wear wrap-around sunglasses, shower after spending time outdoors, and keep windows closed during peak hours (11:00–16:00). The PollenPal app provides hourly pollen forecasts and personalised alerts for Lisbon and other European cities.