Letchworth Garden City pollen forecast - today, tomorrow and the week ahead

Today (16 July) pollen in Letchworth Garden City is low; grass is low. Tomorrow (17 July 2026) levels are similar. Over the following five days grass will increase. Forecasts are calculated by Airmine using satellites to map local vegetation and determine pollen season onset.

For long term forecasts and maps, see the Airmine app

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

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The nearby stretch of open moorland adds further grass and tree pollen exposure, particularly under southwesterly winds. On top of that, plane and lime are the two species driving most tree pollen in Letchworth Garden City, especially around parks and green corridors. It's a pattern shared by plenty of similarly sized towns nearby, shaped more by geography than anything unusual locally.

Today - 16 July

  • Alder (Alnus):

    None

    0/100

  • Birch (Betula):

    None

    0/100

  • Hazel (Corylus):

    None

    0/100

  • Cypress (Cupressaceae):

    None

    0/100

  • Grass (Poaceae):

    Low

    8/100

  • Willow (Salicaceae):

    None

    0/100

  • Mugwort (Artemisia):

    None

    0/100

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 - 17 July

  • Alder (Alnus):

    None

    0/100

  • Birch (Betula):

    None

    0/100

  • Hazel (Corylus):

    None

    0/100

  • Cypress (Cupressaceae):

    None

    0/100

  • Grass (Poaceae):

    Low

    7/100

  • Willow (Salicaceae):

    None

    0/100

  • Mugwort (Artemisia):

    None

    0/100

Air quality in Letchworth Garden City

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Frequently Asked Questions

Is pollen high in Letchworth Garden City right now?

On 16 July 2026, overall pollen levels in Letchworth Garden City are low. Grass is the main contributor to airborne pollen

Will pollen levels change in Letchworth Garden City tomorrow?

On 17 July 2026, pollen conditions in Letchworth Garden City will be similar to today, with grass at low levels

Is pollen expected to decrease in Letchworth Garden City this week?

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

Which pollen types are currently active in Letchworth Garden City?

On 16 July 2026, Grass is the dominant pollen source in Letchworth Garden City. alder, artemisia, birch, hazel, cypress, and willow are not currently active.

When is pollen season in Letchworth Garden City?
If you're wondering when hay fever kicks off in Letchworth Garden City, it's mostly down to plane and lime. You'll usually see plane pollen from around April through June, while lime follows on from May 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. Something to plan around if pollen usually gets to you.
How often is the Letchworth Garden City pollen forecast updated?

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

Does pollen in Letchworth Garden City 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 Letchworth Garden City 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 Letchworth Garden City, 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:

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

Data provided by Airmine — Last update: 16 July 2026 at 10:33 CEST (Data is updated four times daily.)

This page provides the latest public pollen forecast for Letchworth Garden City.

For long term forecasts and maps, see the Airmine app

Download on the App Store Get it on Google Play

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