Name: Pollen forecast for Cardiff (2026-09-01)
Creator: Pollen Count
Published: 2026-09-01T15:30:26Z
License: https://pollencount.org/terms/

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About Pollen in Cardiff

Cardiff’s seasonal allergy profile commences spring with dominant birch and oak pollen, originating from extensive urban green spaces including Bute Park and Roath Park; summer transitions to peak grass pollen from River Taff floodplains and peripheral meadows.

The city’s sheltered valley topography, combined with prevailing south-westerly winds from the Bristol Channel, can trap and concentrate airborne allergens, particularly within the urban basin. Late autumn and winter elevate mould spore counts, exacerbated by Cardiff’s often damp climate and the decomposition of organic matter in humid, shaded locales.

The pollen count in Cardiff today is V.HI, driven mainly by Mugwort.

V.HI

14 active species

Refreshing live forecast…

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4-Day Forecast:

Morning

Grass MED

Tree LOW

Weed HIGH

Afternoon

Grass MED

Tree LOW

Weed V.HI

Evening

Grass LOW

Tree LOW

Weed HIGH

Species	Level	Count
🌿 Mugwort	V.HI	46 grains/m³
🌿 Giant Ragweed	V.HI	31 grains/m³
🌿 Common Ragweed	HIGH	26 grains/m³
🌾 Cock's-foot	MED	18 grains/m³
🌾 Grass (mixed)	MED	18 grains/m³
+35 more tracked Perennial Ryegrass Stinging Nettle Timothy Grass Ribwort Plantain Russian Thistle Fat Hen Pigweed Western Ragweed Common Sorrel Box Elder Alder Sagebrush Paper Birch Silver Birch Downy Birch Australian Pine Japanese Cypress Hazel Japanese Cedar Mediterranean Cypress Bermuda Grass Ash Mountain Cedar White Mulberry Olive Pellitory-of-the-wall Upright Pellitory Parthenium Weed London Plane Black Poplar Mesquite White Oak Holm Oak English Oak Field Elm All species in the app: Android iOS
🌿 Mugwort	V.HI	34 grains/m³
🌿 Giant Ragweed	HIGH	23 grains/m³
🌿 Common Ragweed	HIGH	19 grains/m³
🌿 Stinging Nettle	MED	11 grains/m³
🌿 Russian Thistle	MED	8 grains/m³
+35 more tracked Fat Hen Cock's-foot Perennial Ryegrass Ribwort Plantain Grass (mixed) Timothy Grass Pigweed Western Ragweed Common Sorrel Box Elder Alder Sagebrush Paper Birch Silver Birch Downy Birch Australian Pine Japanese Cypress Hazel Japanese Cedar Mediterranean Cypress Bermuda Grass Ash Mountain Cedar White Mulberry Olive Pellitory-of-the-wall Upright Pellitory Parthenium Weed London Plane Black Poplar Mesquite White Oak Holm Oak English Oak Field Elm All species in the app: Android iOS
🌿 Mugwort	X.HI	51 grains/m³
🌿 Giant Ragweed	V.HI	34 grains/m³
🌿 Common Ragweed	HIGH	29 grains/m³
🌿 Stinging Nettle	HIGH	17 grains/m³
🌾 Cock's-foot	MED	16 grains/m³
+35 more tracked Grass (mixed) Perennial Ryegrass Timothy Grass Russian Thistle Ribwort Plantain Fat Hen Pigweed Western Ragweed Common Sorrel Box Elder Alder Sagebrush Paper Birch Silver Birch Downy Birch Australian Pine Japanese Cypress Hazel Japanese Cedar Mediterranean Cypress Bermuda Grass Ash Mountain Cedar White Mulberry Olive Pellitory-of-the-wall Upright Pellitory Parthenium Weed London Plane Black Poplar Mesquite White Oak Holm Oak English Oak Field Elm All species in the app: Android iOS
🌿 Mugwort	V.HI	41 grains/m³
🌿 Giant Ragweed	HIGH	27 grains/m³
🌿 Common Ragweed	HIGH	23 grains/m³
🌾 Cock's-foot	MED	14 grains/m³
🌾 Grass (mixed)	MED	14 grains/m³
+35 more tracked Perennial Ryegrass Stinging Nettle Timothy Grass Russian Thistle Fat Hen Ribwort Plantain Pigweed Western Ragweed Common Sorrel Box Elder Alder Sagebrush Paper Birch Silver Birch Downy Birch Australian Pine Japanese Cypress Hazel Japanese Cedar Mediterranean Cypress Bermuda Grass Ash Mountain Cedar White Mulberry Olive Pellitory-of-the-wall Upright Pellitory Parthenium Weed London Plane Black Poplar Mesquite White Oak Holm Oak English Oak Field Elm All species in the app: Android iOS

Last updated: 15:30 UTC

4-Day Forecast	Tree	Grass	Weed
Tue 1 Sep	LOW	MED	V.HI
Wed 2 Sep	LOW	MED	V.HI
Thu 3 Sep	LOW	MED	X.HI
Fri 4 Sep	LOW	MED	V.HI

Map of Cardiff (51.477024°, -3.156657°)

More in United Kingdom

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What Pollen Levels Mean

LOW Symptoms are unlikely

MED Moderate risk of symptoms

HIGH Widespread symptoms likely

V.HI Expect significant symptoms

X.HI Extremely high symptom likelihood & severity