Siena pollen forecast - today, tomorrow and the week ahead
Today (25 June) pollen in Siena is high; grass is high; cypress is low. Tomorrow (26 June 2026) levels are similar - grass remains high. Over the following five days grass will decrease; cypress will remain stable. 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
Siena's Crete Senesi hilltop setting and the Arbia River valley below feature oak, linden, and cypress as the main tree pollen sources, with the distinctive cypress-lined Tuscan landscape being particularly iconic locally. Surrounding vineyard farmland extends grass and tree pollen, while the elevated hilltop setting and the hot, dry Tuscan summer concentrate pollen dispersal firmly during spring.
Today - 25 June
-
Alder (Alnus):
None
0/100
-
Birch (Betula):
None
0/100
-
Hazel (Corylus):
None
0/100
-
Cypress (Cupressaceae):
Low
5/100
-
Grass (Poaceae):
High
60/100
-
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):
High
66/100
-
Willow (Salicaceae):
None
0/100
Frequently Asked Questions
Is pollen high in Siena right now?
On 25 June 2026, overall pollen levels in Siena are high. Grass is the main contributor to airborne pollen, while cypress remain at lower levels
Will pollen levels change in Siena tomorrow?
On 26 June 2026, pollen conditions in Siena will be different from today, with grass at high levels
Is pollen expected to decrease in Siena this week?
According to the five-day outlook, grass pollen levels are expected to gradually decrease, suggesting improving conditions later in the week.
Which pollen types are currently active in Siena?
On 25 June 2026, Grass is the dominant pollen source in Siena. cypress are also present but at lower levels. alder, birch, hazel, and willow are not currently active.
When is pollen season in Siena?
How often is the Siena pollen forecast updated?
The Siena pollen forecast is updated four times daily. See the timestamp below for the most recent update.
Does pollen in Siena 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 Siena 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 Siena, 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 Italy?
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 Siena.
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.