Portsmouth pollen forecast - today, tomorrow and the week ahead

Today (25 June) pollen in Portsmouth is low; grass is low. Tomorrow (26 June 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

Portsmouth has more limited tree cover than inland cities, but still includes allergenic species like grass and some street trees, with green spaces such as Southsea Common contributing to local pollen. Within the city, exposure varies between dense built-up coastal areas with lower vegetation and pockets of parks and gardens where pollen can be higher. Surrounding areas inland from Portsmouth have more continuous vegetation, leading to stronger and more widespread pollen levels than in the urban coastal core.

Today - 25 June

  • Alder (Alnus):

    None

    0/100

  • Birch (Betula):

    None

    0/100

  • Hazel (Corylus):

    None

    0/100

  • Cypress (Cupressaceae):

    None

    0/100

  • Grass (Poaceae):

    Low

    25/100

  • Willow (Salicaceae):

    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 - 26 June

  • Alder (Alnus):

    None

    0/100

  • Birch (Betula):

    None

    0/100

  • Hazel (Corylus):

    None

    0/100

  • Cypress (Cupressaceae):

    None

    0/100

  • Grass (Poaceae):

    Low

    20/100

  • Willow (Salicaceae):

    None

    0/100

Frequently Asked Questions

Is pollen high in Portsmouth right now?

On 25 June 2026, overall pollen levels in Portsmouth are low. Grass is the main contributor to airborne pollen

Will pollen levels change in Portsmouth tomorrow?

On 26 June 2026, pollen conditions in Portsmouth will be similar to today, with grass at low levels

Is pollen expected to decrease in Portsmouth this week?

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

Which pollen types are currently active in Portsmouth?

On 25 June 2026, Grass is the dominant pollen source in Portsmouth. alder, birch, hazel, cypress, and willow are not currently active.

When is pollen season in Portsmouth?
Portsmouth's coastal position and island setting mean onshore winds frequently disperse pollen, keeping levels lower than many inland towns. The pollen season opens with hazel and alder in late winter, followed by oak and ash in parks such as Victoria Park through April and May. Grass pollen peaks through June and July. The surrounding Solent and limited rural hinterland mean local urban sources dominate exposure throughout the season.
How often is the Portsmouth pollen forecast updated?

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

Does pollen in Portsmouth 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 Portsmouth 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 Portsmouth, 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 Sheffield Southampton

Check pollen in other popular cities:

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Data provided by Airmine — Last update: 25 Jun 2026, 09:01 CET (Data is updated four times daily.)

This page provides the latest public pollen forecast for Portsmouth.

For long term forecasts and maps, see 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

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