Pollen Count in Cardiff

4-Day Chart
Annual Overview

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Cardiff has two main pollen seasons. Tree pollen season starts in March and lasts until May. During this time, trees release tiny particles called pollen into the air.

Updated: 4/9/2026

Grass pollen season starts in May and lasts until July. Pollen from grass makes the air thick with yellow dust. This makes it hard to breathe outside.

Weed pollen season starts in late summer. It's not as strong as tree or grass pollen. Some plants like nettles and docks produce pollen at this time.

Pollen counts are usually higher on warm, sunny days. Rain helps to wash pollen out of the air. People notice more pollen on windy days in Cardiff.

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 Cardiff 🌾. 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	0	0	0	0	0
Feb	0.4	0	0	0	0	0
Mar	182.1	28.9	0	0	0	0
Apr	149.8	751.9	1.3	0	0	0
May	0.2	38.8	38.8	0	0.2	0
Jun	0	0	416.5	10.2	0	0
Jul	0	0.1	255.2	142.3	0	0
Aug	0	0	33.3	29.8	0	0.2
Sep	0	0	0.8	0.1	0	0.6
Oct	0	0	0	0	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 Cardiff 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.