Castle Cary pollen forecast - today, tomorrow and the week ahead
Pollen Today
Today (20 September) pollen in Castle Cary is moderate; mugwort is moderate.
Pollen Tomorrow
Tomorrow (21 September 2026) levels are similar to today.
7-Day Trend
Over the next week mugwort will increase; cypress, grass, 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) | Moderate | 42/100 |
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) | Moderate | 45/100 |
Local Environmental Conditions
Tree pollen in Castle Cary comes mostly from oak and birch, with parks and mature gardens standing in contrast to the more built-up centre. Fields and hedgerows just outside town push grass pollen counts up noticeably once shifting coastal winds set in. This combination means residents feel both urban and rural pollen sources depending on which way the wind's blowing.
Ask anyone with allergies in Castle Cary and they'll tell you it's oak and birch that cause the trouble. Oak pollen typically runs from April to May, before birch takes over, usually March to May. Don't forget grass, either — it runs May to September and usually causes the most trouble in June and July. Useful to know if you tend to feel it every spring.
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Frequently Asked Questions About Pollen in Somerset
Is pollen high in Castle Cary right now?
On 20 September 2026, overall pollen levels in Castle Cary are moderate. Artemisia is the main contributor to airborne pollen
Will pollen levels change in Castle Cary tomorrow?
On 21 September 2026, pollen conditions in Castle Cary will be similar to today, with artemisia at moderate levels
Is pollen expected to decrease in Castle Cary this week?
According to the five-day outlook, artemisia pollen levels will increase later in the week.
Which pollen types are currently active in Castle Cary?
On 20 September 2026, Artemisia is the dominant pollen source in Castle Cary. cypress, grass, and willow are not currently active.
When is pollen season in Castle Cary?
How often is the Castle Cary pollen forecast updated?
The Castle Cary pollen forecast is updated four times daily. See the timestamp below for the most recent update.
Does pollen in Castle Cary 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 Castle Cary 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 Castle Cary, 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).
