Pollen Count in Oeiras

4-Day Chart
Annual Overview

📱 Know your air. Daily Oeiras pollen levels on your iPhone.

Oeiras, Portugal has pollen seasons. Trees and plants release pollen into the air. This happens when the weather gets warmer. Pollen counts are usually low in winter.

Updated: 7/6/2026

In spring, pollen counts increase. Trees like olive and oak release a lot of pollen. This usually happens in March and April. Pollen counts can be very high.

Summer is also a time with high pollen counts. Grasses and weeds release pollen. July and August are the peak months. Pollen counts can be high on hot days.

In autumn, pollen counts decrease. Some trees and plants still release pollen. September and October have lower pollen counts. Winter comes and pollen counts get low again.

Pollen Forecast Chart

Recommendations

When pollen concentrations reach a peak, we suggest these simple steps to help with hay fever. These tips are extra important on windy days when plants are in peak anthesis (the time when they release the most pollen).

Wear masks if necessary
Shower after going out
Wear sunglasses if windy
Close windows and doors
Use an indoor air purifier
Avoid wearing woolen clothes outside
Limit outdoor activities

Annual Pollen Overview

Check out this month-by-month overview of the daily average pollen count in Oeiras 🌾. This data is based on previous years and serves as a guideline to help you understand when different pollen seasons typically occur in your city.

	Alder	Birch	Grass	Olive
Jan	0.3	0	0	0
Feb	1.8	0	0.4	0
Mar	1.6	10.5	8.4	0.1
Apr	0.2	3.5	66	190.7
May	0	1	208.7	117.3
Jun	0	0	120.6	2.9
Jul	0	0	51.7	0.3
Aug	0	0	16.2	0
Sep	0	0	2.6	0
Oct	0	0	1	0
Nov	0	0	0	0
Dec	0	0	0	0

Nearby Places

Disclaimer * The pollen count information provided for Oeiras is for educational purposes only, sourced from the CAMS European air quality database. We cannot guarantee its accuracy or reliability. This information is not a substitute for professional medical advice. Consult a qualified healthcare provider for medical concerns. We are not medical professionals.