Pollen Forecast London — May 19, 2026
Live pollen levels for hay fever and allergy sufferers in London, United Kingdom
Today's Pollen Levels in London
Today's Forecast Conditions
Pollen concentrations in London are barely measurable today, May 19, 2026. Nearly all allergy sufferers should feel comfortable outdoors.
This is a very good day for outdoor plans. Most people with seasonal allergies will experience little or no symptoms. Light exercise and extended time outside are fine.
7-Day Pollen Forecast for London
Pollen Season in London
London's pollen season is shaped by its mild, damp climate and the abundance of parks, commons, and riverside meadows that blanket the city. Birch trees are the first to trigger symptoms, releasing clouds of pollen from March through late April in Hyde Park, Hampstead Heath, and along the Thames corridor. Grass pollen then dominates from May through late July, reaching peak concentrations during warm, breezy afternoons. Urban heat islands in the City and Canary Wharf can extend the season by several days compared to outer suburbs. Mugwort adds a secondary wave for sufferers in August. Rain provides temporary relief but post-storm pollen bursts are common. Hay fever affects roughly one in five Londoners, making the capital one of the UK's most challenging cities for allergy sufferers during the summer months.
- Check the Met Office pollen forecast each morning — London often has higher counts than the national average due to urban heat retention.
- Avoid Richmond Park and Hampstead Heath during peak grass season (June) on dry, windy afternoons when counts reach Very High levels.
- Keep windows closed on the South Bank and in central parks; the river breeze carries significant grass pollen from Surrey meadows upstream.
Frequently Asked Questions
What is the pollen count in London today?
Today, May 19, 2026, the dominant pollen in London is Grass at Low levels. The maximum recorded value is 1.0 grains/m³. PollenPal updates this data daily.
When is hay fever season in London?
The main hay fever season in London runs from May to July. 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 London right now?
As of May 19, 2026, the highest pollen type in London 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 London today?
Birch pollen in London today (May 19, 2026) is at Low levels (0.0 grains/m³). Birch season in London typically peaks in spring. For personalised birch pollen alerts, download the PollenPal app.
How do I reduce hay fever symptoms in London?
To reduce hay fever symptoms in London: 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 London and other European cities.