Bishops Waltham pollen forecast - today, tomorrow and the week ahead
Pollen Today
Today (20 September) pollen in Bishops Waltham is high; mugwort is high.
Pollen Tomorrow
Tomorrow (21 September 2026) levels are similar to today.
7-Day Trend
Over the next week grass and mugwort will increase; cypress 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) | High | 53/100 |
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 | 51/100 |
Local Environmental Conditions
Residents in Bishops Waltham dealing with hay fever usually point to plane and lime as the culprits, particularly in spring near parks and gardens. The nearby woodland nearby is a notable secondary source, feeding pollen into town whenever the wind shifts to the the coast. This combination means residents feel both urban and rural pollen sources depending on which way the wind's blowing.
Locals in Bishops Waltham usually notice plane first, with lime not far behind it. Expect plane pollen roughly from April to June, and lime keeps things going from May right through to July. Then grass pollen takes the baton from May all the way to September, usually peaking in June and July — that's when most people really feel it. Good to know if you're planning anything outdoors that time of year.
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Frequently Asked Questions About Pollen in Hampshire
Is pollen high in Bishops Waltham right now?
On 20 September 2026, overall pollen levels in Bishops Waltham are high. Artemisia is the main contributor to airborne pollen
Will pollen levels change in Bishops Waltham tomorrow?
On 21 September 2026, pollen conditions in Bishops Waltham will be similar to today, with artemisia at high levels
Is pollen expected to decrease in Bishops Waltham this week?
According to the five-day outlook, artemisia and grass pollen levels will increase later in the week.
Which pollen types are currently active in Bishops Waltham?
On 20 September 2026, Artemisia is the dominant pollen source in Bishops Waltham. cypress, grass, and willow are not currently active.
When is pollen season in Bishops Waltham?
How often is the Bishops Waltham pollen forecast updated?
The Bishops Waltham pollen forecast is updated four times daily. See the timestamp below for the most recent update.
Does pollen in Bishops Waltham 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 Bishops Waltham 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 Bishops Waltham, 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. |
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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).
