Pollen forecast by city › London
Pollen forecast for London today
Pollen levels in London today by trees, grasses and weeds, the forecast for the coming days, and when each plant’s pollen season usually starts and peaks.
In London, the tree pollen season typically runs from late March to mid-May, according to the Met Office, with birch peaking in April and May. Allergy UK describes birch as the most allergenic tree, and people sensitised to it may react earlier to hazel and alder, which flower in late winter. Grass pollen is in the air from mid-May until July, with a main peak in the first two weeks of June and a smaller one in early July. Weed pollen follows from the end of June to September. The exact timing varies with the weather each year.
Pollen today
- Trees0 · none
- Grasses1 · very low
- Weeds1 · very low
- Mugwort1 · very low
Data updated Mon, 12 Oct, 06:05, local time.
Pollen forecast for the next days
| Day | Overall | Trees | Grasses | Weeds | Mugwort |
|---|---|---|---|---|---|
| Tomorrow, Tue, 13 Oct | Overall1 · very low | Trees0 · none | Grasses0 · none | Weeds1 · very low | Mugwort1 · very low |
| Wed, 14 Oct | Overall1 · very low | Trees0 · none | Grasses0 · none | Weeds1 · very low | Mugwort1 · very low |
| Thu, 15 Oct | no data | ||||
| Fri, 16 Oct | no data | ||||
In bloom now
- Ragweed
Pollen season calendar for London
When pollen of each plant is usually in the air in London, month by month. The calendar is an estimate for a typical year; the actual start shifts with the weather by a week or two.
| Plant | January | February | March | April | May | June | July | August | September | October | November | December |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Hazelseason Jan – Mar, peak Feb – Mar | ||||||||||||
| Alderseason Feb – Apr, peak Mar – Apr | ||||||||||||
| Birchseason Mar – May, peak Apr – May | ||||||||||||
| Ashseason Mar – May, peak Apr – May | ||||||||||||
| Cottonwoodseason Apr – Jun, peak Apr – May | ||||||||||||
| Oakseason Apr – Jun, peak May | ||||||||||||
| Pineseason Apr – Jun, peak May – Jun | ||||||||||||
| Grassesseason May – Sep, peak Jun – Aug | ||||||||||||
| Mugwortseason Jul – Oct, peak Aug – Sep | ||||||||||||
| Ragweedseason Aug – Oct, peak Sep – Oct |
On high-pollen days
- Pollen levels are usually highest on warm, dry and windy days; rain washes pollen out of the air for a while.
- Keep windows closed when the level is high and air rooms after rain.
- After a long time outdoors, change clothes and wash your hair; dry laundry indoors.
- Sunglasses help keep pollen out of your eyes.
- If you have allergy symptoms, talk to a doctor — this page does not replace medical advice.
About the data
Current levels and the forecast come from the Google Pollen API. It is a model forecast on the Universal Pollen Index (0–5), not a measurement from a local pollen trap. The season calendar is AllergoRadar’s estimate based on model data and published pollen calendars. Reference information only, not medical advice.
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