Pollen Count in Portland

4-Day Chart
Annual Overview

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In Portland, UK, trees start releasing pollen in late March. This is the start of pollen season. Trees like oak, birch, and hazel are the main culprits.

Updated: 3/23/2026

In May, grasses start pollinating. This adds to the pollen count. The mix of tree and grass pollen makes May the worst month for pollen levels.

In June, grasses are still pollinating, but the tree pollen count goes down. This means the pollen count is still high, but not as bad as May.

By July, pollen levels start to drop. The pollen season slowly comes to an end. Autumn and winter have very low pollen counts, making them a relief for people bothered by pollen.

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 Portland 🌾. 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	Mugwort	Olive	Ragweed
Jan	0.3	0	0	0	0	0
Feb	10.6	0	0	0	0	0
Mar	11.2	40.1	0	0	0	0
Apr	0.3	62.1	1.2	0	0.1	0
May	0	4.7	35.5	0	0.1	0
Jun	0	0.2	325.3	4.1	0	0
Jul	0	0	75.8	14.6	0	0
Aug	0	0	7.4	1.9	0	0.1
Sep	0	0	0.9	0.4	0	2.8
Oct	0	0	0	0.1	0	0
Nov	0	0	0	0	0	0
Dec	0	0	0	0	0	0

Nearby Places

Disclaimer * The pollen count information provided for Portland 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.