Heidelberg pollen forecast - today, tomorrow and the week ahead
Pollen Today
Today (20 September) pollen in Heidelberg is low; mugwort is low.
Pollen Tomorrow
Tomorrow (21 September 2026) mugwort no longer expected.
7-Day Trend
Over the next week mugwort will increase; cypress, grass, and willow will remain stable.
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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) | Low | 4/100 |
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) | None | 0/100 |
Local Environmental Conditions
In Heidelberg, ash, linden, and maple anchor the parks and street trees as primary pollen sources, with levels differing between green space and the built-up core. Nearby Swabian farmland along with valley-floor orchards add tree and grass pollen through the season, while the sheltered valley floor can hold pollen under calm, still air.
Heidelberg's pollen season stretches across January into August, led off by alder and hazel in early January prior to birch pollen rising sharply across April. Summer grass pollen follows, peaking in June and July. The Neckar valley and surrounding Swabian farmland around Heidelberg combine vineyards, orchards, and arable fields, keeping grass and orchard pollen elevated through early summer.
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Frequently Asked Questions About Pollen in Baden-Württemberg
Is pollen high in Heidelberg right now?
On 20 September 2026, overall pollen levels in Heidelberg are low. Artemisia is the main contributor to airborne pollen
Will pollen levels change in Heidelberg tomorrow?
On 21 September 2026, pollen conditions in Heidelberg will be similar to today with no significant pollen expected.
Is pollen expected to decrease in Heidelberg this week?
According to the five-day outlook, artemisia pollen levels will increase later in the week.
Which pollen types are currently active in Heidelberg?
On 20 September 2026, Artemisia is the dominant pollen source in Heidelberg. cypress, grass, and willow are not currently active.
When is pollen season in Heidelberg?
How often is the Heidelberg pollen forecast updated?
The Heidelberg pollen forecast is updated four times daily. See the timestamp below for the most recent update.
Does pollen in Heidelberg 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 Heidelberg 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 Heidelberg, 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. |
Get More in the Airmine Pollen app
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).
