Castelo Branco pollen forecast - today, tomorrow and the week ahead
Today (25 June) pollen in Castelo Branco is low; grass is low. Tomorrow (26 June 2026) levels are similar - grass increasing. 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
Developed with support from the European Space Agency (ESA)’s Business Applications and Space Solutions (BASS) team
Castelo Branco's Tejo River valley and the surrounding Beira Baixa landscape feature oak, olive, and eucalyptus as the main tree pollen sources in this Portuguese inland city. Surrounding farmland and the Castelo Branco plain contribute substantial tree and grass pollen, while the continental-influenced Atlantic climate means the season opens earlier than in highland interior cities throughout.
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
18/100
-
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):
Medium
46/100
-
Willow (Salicaceae):
None
0/100
Frequently Asked Questions
Is pollen high in Castelo Branco right now?
On 25 June 2026, overall pollen levels in Castelo Branco are low. Grass is the main contributor to airborne pollen
Will pollen levels change in Castelo Branco tomorrow?
On 26 June 2026, pollen conditions in Castelo Branco will be different from today, with grass increasing
Is pollen expected to decrease in Castelo Branco this week?
According to the five-day outlook, grass pollen levels will increase later in the week.
Which pollen types are currently active in Castelo Branco?
On 25 June 2026, Grass is the dominant pollen source in Castelo Branco. willow, alder, birch, hazel, and cypress are not currently active.
When is pollen season in Castelo Branco?
How often is the Castelo Branco pollen forecast updated?
The Castelo Branco pollen forecast is updated four times daily. See the timestamp below for the most recent update.
Does pollen in Castelo Branco 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 Castelo Branco 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 Castelo Branco, 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 Portugal?
Check pollen in other popular cities:
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 Castelo Branco.
For long term forecasts and maps, see the Airmine app
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.