Horncastle pollen forecast - today, tomorrow and the week ahead

Today (9 August) pollen in Horncastle is high; mugwort is high; cypress and grass are low. Tomorrow (10 August 2026) levels are similar - mugwort declining. Over the following five days cypress, grass, and mugwort will increase. Forecasts are calculated by Airmine using satellites to map local vegetation and determine pollen season onset.

Get the full experience in the Airmine app.

Download on the App Store Get it on Google Play

Developed with support from the European Space Agency (ESA)’s Business Applications and Space Solutions (BASS) team

Follow your pollen exposure and performance with the free Airmine–Strava integration. See your pollen and air quality exposure for every Strava activity.

Learn more

Overall exposure follows the broader regional trend, moderated somewhat by the town's parks and gardens. That's on top of rowan and birch, which are the main local tree pollen sources around Horncastle's parks and quieter streets. The nearby nearby parkland adds further grass and tree pollen exposure, particularly under prevailing westerlies.

Today - 9 August

  • Alder (Alnus):

    None

    0/100

  • Birch (Betula):

    None

    0/100

  • Hazel (Corylus):

    None

    0/100

  • Cypress (Cupressaceae):

    Low

    4/100

  • Grass (Poaceae):

    Low

    6/100

  • Willow (Salicaceae):

    None

    0/100

  • Mugwort (Artemisia):

    High

    57/100

High pollen levels may trigger sneezing, itchy eyes, and congestion. Airmine's neighbourhood estimates use satellites to map local vegetation and a statistical prediction model, updated four times daily.

Tomorrow - 10 August

  • 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):

    Medium

    32/100

Air quality in Horncastle

View air quality

Frequently Asked Questions

Is pollen high in Horncastle right now?

On 9 August 2026, overall pollen levels in Horncastle are high. Artemisia is the main contributor to airborne pollen, while grass and cypress remain at lower levels

Will pollen levels change in Horncastle tomorrow?

On 10 August 2026, pollen conditions in Horncastle will be different from today, with artemisia continuing to decline

Is pollen expected to decrease in Horncastle this week?

According to the five-day outlook, grass, artemisia, and cypress pollen levels will increase later in the week.

Which pollen types are currently active in Horncastle?

On 9 August 2026, Artemisia is the dominant pollen source in Horncastle. grass and cypress are also present but at lower levels. willow and hazel are not currently active.

When is pollen season in Horncastle?
In Horncastle, the pollen calendar starts with rowan and rolls straight into birch. You'll usually see rowan pollen from around May through June, and birch keeps things going from March right through to May. 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. Worth factoring in if hay fever's ever been an issue for you here.
How often is the Horncastle pollen forecast updated?

The Horncastle pollen forecast is updated four times daily. See the timestamp below for the most recent update.

Does pollen in Horncastle 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 Horncastle 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 Horncastle, 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.

Want to see pollen forecasts for other cities in United Kingdom?

Birmingham Bristol Glasgow Leeds Liverpool London Manchester Portsmouth Sheffield Southampton

Check pollen in other popular cities:

Melton Rio de Janeiro Copenhagen Athens Denpasar Rome Cape Town Barcelona London Los Angeles New York

Data provided by Airmine — Last update: 9 August 2026 at 20:27 CEST (Data is updated four times daily.)

This page provides the latest public pollen forecast for Horncastle.

Get the full experience in the Airmine app.

Download on the App Store Get it on Google Play

Unless explicitly made clear, the content on this site has not been paid for by external organisations and is Airmine's sole responsibility.

Disclaimer: Forecasts are provided for informational purposes only and should not be relied upon as medical advice. Actual pollen and air quality conditions may vary from the forecast. If you have allergies, asthma, or another medical condition, consult a healthcare professional. Please see our Terms of Service for important information about limitations of liability.