Name: Pollen forecast for Merton (2026-09-01)
Creator: Pollen Count
Published: 2026-09-01T15:30:36Z
License: https://pollencount.org/terms/

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About Pollen in Merton

Merton’s spring allergy profile is dominated by Birch and Oak pollen, peaking March-May from extensive street trees and woodlands, notably Wimbledon Common and Morden Hall Park; summer sees high Grass pollen counts, prevalent May-July from open spaces, Mitcham Common, and River Wandle riparian zones.

Urban topography and the Wandle Valley microclimate can trap and concentrate local pollen plumes; prevailing south-westerly winds also transport regional allergens. Autumn’s late-season challenge is Mould spores, peaking September-November due to damp leaf litter decomposition in green spaces and shaded urban environments.

The pollen count in Merton today is HIGH, driven mainly by Giant Ragweed.

HIGH

15 active species

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4-Day Forecast:

Morning

Grass MED

Tree LOW

Weed MED

Afternoon

Grass MED

Tree LOW

Weed HIGH

Evening

Grass LOW

Tree LOW

Weed MED

Species	Level	Count
🌿 Giant Ragweed	HIGH	20 grains/m³
🌿 Common Ragweed	HIGH	16 grains/m³
🌿 Mugwort	MED	11 grains/m³
🌾 Perennial Ryegrass	MED	9 grains/m³
🌾 Grass (mixed)	MED	9 grains/m³
+35 more tracked Cock's-foot Timothy Grass Sagebrush Stinging Nettle Pigweed Fat Hen Russian Thistle Western Ragweed 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
🌿 Giant Ragweed	HIGH	24 grains/m³
🌿 Common Ragweed	HIGH	20 grains/m³
🌿 Mugwort	MED	14 grains/m³
🌾 Grass (mixed)	MED	11 grains/m³
🌾 Cock's-foot	MED	10 grains/m³
+35 more tracked Perennial Ryegrass 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
🌿 Giant Ragweed	HIGH	26 grains/m³
🌿 Common Ragweed	HIGH	22 grains/m³
🌿 Mugwort	HIGH	15 grains/m³
🌿 Sagebrush	MED	10 grains/m³
🌿 Stinging Nettle	MED	8 grains/m³
+35 more tracked Fat Hen Perennial Ryegrass Grass (mixed) Russian Thistle Pigweed Western Ragweed Cock's-foot 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
🌿 Giant Ragweed	HIGH	17 grains/m³
🌿 Common Ragweed	MED	14 grains/m³
🌿 Mugwort	MED	10 grains/m³
🌿 Sagebrush	MED	6 grains/m³
🌿 Russian Thistle	MED	5 grains/m³
+35 more tracked Stinging Nettle Pigweed Western Ragweed Fat Hen Ribwort Plantain Cock's-foot Perennial Ryegrass Timothy Grass Grass (mixed) 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	HIGH
Thu 3 Sep	LOW	MED	HIGH
Fri 4 Sep	LOW	LOW	HIGH

Map of Merton (51.394335°, -0.128365°)

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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