Name: Pollen forecast for Cardiff (2026-10-17)
Creator: Pollen Count
Published: 2026-10-17T14:18:15Z
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 high, driven mainly by Mugwort.

HIGH

12 active species

Refreshing live forecast…

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4-Day Forecast:

Morning

Grass MED

Tree LOW

Weed MED

Afternoon

Grass MED

Tree LOW

Weed HIGH

Evening

Grass MED

Tree LOW

Weed HIGH

Species	Level	Count
🌿 Mugwort	HIGH	15 grains/m³
🌾 Cock's-foot	MED	11 grains/m³
🌾 Perennial Ryegrass	MED	10 grains/m³
🌿 Stinging Nettle	MED	9 grains/m³
🌾 Timothy Grass	MED	8 grains/m³
+35 more tracked Grass (mixed) Western Ragweed Ribwort Plantain Pigweed Fat Hen Russian Thistle Common Sorrel Box Elder Alder Common Ragweed Giant Ragweed 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	MED	11 grains/m³
🌾 Cock's-foot	MED	8 grains/m³
🌾 Perennial Ryegrass	MED	8 grains/m³
🌾 Timothy Grass	MED	7 grains/m³
🌾 Grass (mixed)	MED	7 grains/m³
+35 more tracked Stinging Nettle Western Ragweed Fat Hen Ribwort Plantain Russian Thistle Pigweed Common Sorrel Box Elder Alder Common Ragweed Giant Ragweed 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	HIGH	26 grains/m³
🌿 Stinging Nettle	HIGH	16 grains/m³
🌾 Cock's-foot	MED	14 grains/m³
🌿 Western Ragweed	MED	13 grains/m³
🌾 Perennial Ryegrass	MED	13 grains/m³
+35 more tracked Timothy Grass Grass (mixed) Ribwort Plantain Fat Hen Russian Thistle Pigweed Common Sorrel Box Elder Alder Common Ragweed Giant Ragweed 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	MED	9 grains/m³
🌿 Stinging Nettle	MED	6 grains/m³
🌾 Cock's-foot	MED	5 grains/m³
🌿 Western Ragweed	LOW	4 grains/m³
🌾 Perennial Ryegrass	LOW	4 grains/m³
+35 more tracked Timothy Grass Ribwort Plantain Grass (mixed) Pigweed Fat Hen Russian Thistle Common Sorrel Box Elder Alder Common Ragweed Giant Ragweed 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: 14:18 UTC

4-Day Forecast	Tree	Grass	Weed
Sat 17 Oct	LOW	MED	HIGH
Sun 18 Oct	LOW	MED	MED
Mon 19 Oct	LOW	MED	HIGH
Tue 20 Oct	LOW	MED	MED

Map of Cardiff (51.477024°, -3.156657°)

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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