Name: Pollen forecast for Croydon (2026-09-01)
Creator: Pollen Count
Published: 2026-09-01T15:30:28Z
License: https://pollencount.org/terms/

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About Pollen in Croydon

Croydon’s primary spring allergens are Birch (March-May) and Oak (April-June) pollen, sourced from abundant mature trees in Lloyd Park, Park Hill Park, and numerous urban street plantings. Summer brings ubiquitous Grass pollen (June-August), prevalent across open green spaces like Farthing Downs and along the River Wandle Trail’s banks.

The borough’s varied topography and urban heat island effect can concentrate pollen, intensifying exposure. Late-season Mould spores (September-November) proliferate from decaying organic matter in shaded, damp zones of local woodlands and leaf litter in residential areas, peaking post-rainfall.

The pollen count in Croydon today is HIGH, driven mainly by Mugwort.

HIGH

15 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 HIGH

Evening

Grass LOW

Tree LOW

Weed HIGH

Species	Level	Count
🌿 Mugwort	HIGH	28 grains/m³
🌿 Giant Ragweed	HIGH	22 grains/m³
🌿 Common Ragweed	HIGH	18 grains/m³
🌾 Perennial Ryegrass	MED	10 grains/m³
🌾 Grass (mixed)	MED	10 grains/m³
+35 more tracked Cock's-foot Timothy Grass Sagebrush Russian Thistle Stinging Nettle Pigweed Western Ragweed Fat Hen Ribwort Plantain Common Sorrel Box Elder Alder 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	31 grains/m³
🌿 Giant Ragweed	HIGH	25 grains/m³
🌿 Common Ragweed	HIGH	21 grains/m³
🌾 Grass (mixed)	MED	11 grains/m³
🌾 Perennial Ryegrass	MED	10 grains/m³
+35 more tracked Timothy Grass Sagebrush Cock's-foot Stinging Nettle Russian Thistle Pigweed Western Ragweed Fat Hen Ribwort Plantain Common Sorrel Box Elder Alder 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	32 grains/m³
🌿 Giant Ragweed	HIGH	25 grains/m³
🌿 Common Ragweed	HIGH	22 grains/m³
🌿 Sagebrush	MED	9 grains/m³
🌿 Russian Thistle	MED	8 grains/m³
+35 more tracked Stinging Nettle Grass (mixed) Pigweed Western Ragweed Fat Hen Cock's-foot Perennial Ryegrass Timothy Grass Ribwort Plantain Common Sorrel Box Elder Alder 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	18 grains/m³
🌿 Giant Ragweed	MED	14 grains/m³
🌿 Common Ragweed	MED	12 grains/m³
🌿 Sagebrush	MED	5 grains/m³
🌿 Fat Hen	LOW	4 grains/m³
+35 more tracked Russian Thistle Stinging Nettle Pigweed Western Ragweed Perennial Ryegrass Ribwort Plantain Grass (mixed) Cock's-foot Timothy Grass Common Sorrel Box Elder Alder 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	HIGH
Wed 2 Sep	LOW	MED	V.HI
Thu 3 Sep	LOW	MED	V.HI
Fri 4 Sep	LOW	LOW	HIGH

Map of Croydon (51.329567°, 0.002855°)

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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