Llanidloes pollen forecast - today, tomorrow and the week ahead
Pollen Today
Today (20 September) pollen in Llanidloes is none
Pollen Tomorrow
Tomorrow (21 September 2026) grass at low levels, mugwort at moderate levels.
7-Day Trend
Over the next week grass and mugwort will decrease; cypress and willow will remain stable.
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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) | None | 0/100 |
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) | Low | 14/100 | |
| Willow (Salicaceae) | None | 0/100 | |
| Mugwort (Artemisia) | Moderate | 35/100 |
Local Environmental Conditions
Seasonal peaks tend to track the wider regional pattern, tree pollen leading in spring and grass through summer. That's on top of birch and oak, which are the main local tree pollen sources around Llanidloes's parks and quieter streets. The wider Powys countryside supplies additional tree and grass pollen, particularly when light prevailing breezes carry it toward the built-up area.
For Llanidloes, the season kicks off with birch and then hands things over to oak. Birch tends to release pollen between March and May, then oak carries on from April until May. After that, grass pollen carries the season from May through to September, with June and July normally the toughest stretch. Worth factoring in if hay fever's ever been an issue for you here.
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Frequently Asked Questions About Pollen in Powys
Is pollen high in Llanidloes right now?
Currently, there is no significant pollen in Llanidloes.
Will pollen levels change in Llanidloes tomorrow?
On 21 September 2026, pollen conditions in Llanidloes will be different from today, with grass at low levels, artemisia at moderate levels
Is pollen expected to decrease in Llanidloes this week?
According to the five-day outlook, grass and artemisia pollen levels are expected to gradually decrease, suggesting improving conditions later in the week.
Which pollen types are currently active in Llanidloes?
On 20 September 2026, there are no significant pollen types in Llanidloes.
When is pollen season in Llanidloes?
How often is the Llanidloes pollen forecast updated?
The Llanidloes pollen forecast is updated four times daily. See the timestamp below for the most recent update.
Does pollen in Llanidloes 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 Llanidloes 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 Llanidloes, 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).
