Walthamstow pollen forecast - today, tomorrow and the week ahead
Pollen Today
Today (20 September) pollen in Walthamstow is moderate; mugwort is moderate.
Pollen Tomorrow
Tomorrow (21 September 2026) mugwort increasing.
7-Day Trend
Over the next week mugwort will increase; cypress, grass, and willow will remain stable.
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Features and forecast availability vary by region.
Pollen Risk
Today - 20 September
| Pollen species | Level | Value |
|---|---|---|
| Alder (Alnus) | None | 0/100 |
| Birch (Betula) | None | 0/100 |
| Hazel (Corylus) | None | 0/100 |
| Cypress (Cupressaceae) | None | 0/100 |
| Grass (Poaceae) | None | 0/100 |
| Willow (Salicaceae) | None | 0/100 |
| Mugwort (Artemisia) | Moderate | 45/100 |
Tomorrow - 21 September
| Pollen species | Level | Value | 7-Day Trend |
|---|---|---|---|
| Alder (Alnus) | None | 0/100 | — |
| Birch (Betula) | None | 0/100 | — |
| Hazel (Corylus) | None | 0/100 | — |
| Cypress (Cupressaceae) | None | 0/100 | |
| Grass (Poaceae) | None | 0/100 | |
| Willow (Salicaceae) | None | 0/100 | |
| Mugwort (Artemisia) | High | 59/100 |
Local Environmental Conditions
Grass pollen from surrounding Waltham Forest fields is significant through the summer months, carried in by onshore breezes. On top of that, oak and beech are the two species driving most tree pollen in Walthamstow, especially around parks and green corridors. Seasonal peaks tend to track the wider regional pattern, tree pollen leading in spring and grass through summer.
Pollen season in Walthamstow really gets going with oak, followed not long after by beech. Oak tends to release pollen between April and May, and beech keeps things going from April right through to May. Don't forget grass, either — it runs May to September and usually causes the most trouble in June and July. Worth keeping an eye on the forecast if you're sensitive.
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Frequently Asked Questions About Pollen in Waltham Forest
Is pollen high in Walthamstow right now?
On 20 September 2026, overall pollen levels in Walthamstow are moderate. Artemisia is the main contributor to airborne pollen
Will pollen levels change in Walthamstow tomorrow?
On 21 September 2026, pollen conditions in Walthamstow will be different from today, with artemisia increasing
Is pollen expected to decrease in Walthamstow this week?
According to the five-day outlook, artemisia pollen levels will increase later in the week.
Which pollen types are currently active in Walthamstow?
On 20 September 2026, Artemisia is the dominant pollen source in Walthamstow. cypress, grass, and willow are not currently active.
When is pollen season in Walthamstow?
How often is the Walthamstow pollen forecast updated?
The Walthamstow pollen forecast is updated four times daily. See the timestamp below for the most recent update.
Does pollen in Walthamstow come from nearby or far away?
Studies show that most pollen exposure (often 70–90%) comes from nearby sources, such as local trees and vegetation. A good pollen forecast therefore depends on accurately representing local vegetation. Pollen can travel long distances, but this usually matters only early in the season or during specific wind events.
Are pollen levels in Walthamstow based on measurements or forecasts?
Pollen data is often misunderstood. Most "pollen levels" are not real-time measurements, but forecasts.
Direct pollen measurements are typically delayed by 1-2 days because they require manual analysis. To show current conditions in Walthamstow, modern forecasts combine recent measurements, weather data, and information about local vegetation.
This allows us to estimate pollen levels for today and the coming days, not just report the past.
Airmine’s atmospheric monitoring platform was developed with support from the European Space Agency (ESA)’s Business Applications and Space Solutions (BASS) team, using satellite and Earth observation technologies to improve emissions monitoring.
Understanding the Scale
The 0–100 scores represent risk levels, not direct measurements of pollen or air pollutant concentrations. Higher scores indicate higher risk. Pollen and air quality use different thresholds.
Pollen
| None | 0 | No or negligible risk of exposure. Pollen/mold exposure is expected to be minimal. |
| Low | 0-25 | Low risk of exposure. Small amounts of pollen or mold spores may be present. |
| Moderate | 25-50 | Moderate risk of exposure. Pollen/mold exposure is expected to be noticeable. |
| High | 50-75 | High risk of exposure. Elevated pollen/mold exposure is expected. |
| Very High | 75-100 | Very high risk of exposure. Pollen/mold exposure is expected to be at or near its highest levels. |
Get More in the Airmine Pollen app
Get 15-day pollen forecasts with morning, afternoon and evening detail, plus 5-day air quality forecasts. Explore interactive pollen risk maps, estimated pollen season start, route profiles and a symptoms diary.
Features and forecast availability vary by region. Currently covering Europe, the contiguous US, southern Canada, South Africa, Australia, Indonesia (Java & Bali), Brazil, Paraguay, Uruguay and the Buenos Aires area.
Developed with support from the European Space Agency (ESA) Business Applications and Space Solutions (BASS).
