Hønefoss pollen forecast - today, tomorrow and the week ahead

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

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Hønefoss is a small Buskerud town in Ringerike municipality at the confluence of the Begna and Randselva rivers where birch, hazel, and riverside woodland are the main local pollen sources. The river valley concentrates pollen under calm conditions, while the inland continental Buskerud climate produces a well-defined seasonal progression with birch peaking through April and May before grass contributes through June and July and mugwort extends into September.

Today - 9 August

  • Alder (Alnus):

    None

    0/100

  • Birch (Betula):

    None

    0/100

  • Hazel (Corylus):

    None

    0/100

  • Cypress (Cupressaceae):

    Medium

    27/100

  • Grass (Poaceae):

    Low

    8/100

  • Willow (Salicaceae):

    None

    0/100

  • Mugwort (Artemisia):

    High

    62/100

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):

    Low

    19/100

  • Grass (Poaceae):

    Low

    1/100

  • Willow (Salicaceae):

    None

    0/100

  • Mugwort (Artemisia):

    High

    57/100

Air quality in Hønefoss

View air quality

Pollen and air quality along routes in Hønefoss

Hytteplanmila Ringeriksmaraton

Frequently Asked Questions

Is pollen high in Hønefoss right now?

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

Will pollen levels change in Hønefoss tomorrow?

On 10 August 2026, pollen conditions in Hønefoss will be different from today, with grass at low levels, artemisia at high levels and cypress continuing to decline

Is pollen expected to decrease in Hønefoss this week?

According to the five-day outlook, artemisia pollen levels are expected to gradually decrease, while grass and cypress pollen will increase, suggesting mixed conditions later in the week.

Which pollen types are currently active in Hønefoss?

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

When is pollen season in Hønefoss?
Hønefoss's seasonal pollen activity runs from February through August, led in by alder and hazel in February, before the season's main birch surge arrives which carries through May. Grass follows close behind over June and July. With the sheltered valleys and farmland typical of this part of eastern Norway, the local climate shapes a season that runs a little differently than the Norwegian average.
How often is the Hønefoss pollen forecast updated?

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

Does pollen in Hønefoss 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 Hønefoss 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 Hønefoss, 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 Norway?

Bergen Drammen Fredrikstad Kristiansand Oslo Sandefjord Stavanger Trondheim

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Data provided by Airmine — Last update: 10 August 2026 at 02:34 CEST (Data is updated four times daily.)

This page provides the latest public pollen forecast for Hønefoss.

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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.