Name: Pollen forecast for Croydon (2026-10-17)
Creator: Pollen Count
Published: 2026-10-17T14:18:16Z
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 moderate, driven mainly by Grass (mixed).

MED

13 active species

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4-Day Forecast:

Morning

Grass LOW

Tree LOW

Weed LOW

Afternoon

Grass MED

Tree LOW

Weed MED

Evening

Grass LOW

Tree LOW

Weed LOW

Species	Level	Count
🌾 Grass (mixed)	MED	7 grains/m³
🌿 Mugwort	MED	6 grains/m³
🌾 Cock's-foot	MED	6 grains/m³
🌾 Perennial Ryegrass	MED	6 grains/m³
🌾 Timothy Grass	MED	6 grains/m³
+35 more tracked Western Ragweed Russian Thistle Stinging Nettle Pigweed Sagebrush Fat Hen Ribwort Plantain Common Sorrel Box Elder Alder Common Ragweed Giant Ragweed 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	5 grains/m³
🌾 Cock's-foot	MED	5 grains/m³
🌾 Perennial Ryegrass	MED	5 grains/m³
🌾 Timothy Grass	MED	5 grains/m³
🌾 Grass (mixed)	MED	5 grains/m³
+35 more tracked Western Ragweed Stinging Nettle Pigweed Sagebrush Fat Hen Ribwort Plantain Common Sorrel Russian Thistle Box Elder Alder Common Ragweed Giant Ragweed 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	8 grains/m³
🌾 Cock's-foot	MED	6 grains/m³
🌾 Perennial Ryegrass	MED	6 grains/m³
🌾 Timothy Grass	MED	6 grains/m³
🌾 Grass (mixed)	MED	6 grains/m³
+35 more tracked Western Ragweed Stinging Nettle Pigweed Fat Hen Ribwort Plantain Russian Thistle Sagebrush Common Sorrel Box Elder Alder Common Ragweed Giant Ragweed 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
🌿 Western Ragweed	MED	5 grains/m³
🌿 Fat Hen	LOW	4 grains/m³
🌿 Russian Thistle	LOW	4 grains/m³
🌿 Stinging Nettle	LOW	4 grains/m³
+35 more tracked Pigweed Sagebrush Ribwort Plantain Common Sorrel Cock's-foot Perennial Ryegrass Timothy Grass Grass (mixed) Box Elder Alder Common Ragweed Giant Ragweed 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	MED
Sun 18 Oct	LOW	MED	MED
Mon 19 Oct	LOW	MED	MED
Tue 20 Oct	LOW	LOW	MED

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