Name: Pollen forecast for Greenwich (2026-09-01)
Creator: Pollen Count
Published: 2026-09-01T15:30:31Z
License: https://pollencount.org/terms/

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About Pollen in Greenwich

Greenwich experiences peak tree pollen (Birch, Oak) March-May, originating from Greenwich Park’s mature woodlands, Blackheath’s perimeter trees, and street plantings; summer sees high grass pollen May-July from Greenwich’s extensive green spaces and Thames-side meadows. Urban topography in Greenwich traps pollen, amplifying local concentrations; autumn/winter mould spores from decaying vegetation, particularly near Thames Path damp zones, complete the seasonal profile.

The pollen count in Greenwich 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	15 grains/m³
🌿 Common Ragweed	MED	12 grains/m³
🌿 Mugwort	MED	8 grains/m³
🌾 Perennial Ryegrass	MED	7 grains/m³
🌾 Timothy Grass	MED	7 grains/m³
+35 more tracked Grass (mixed) Cock's-foot 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	18 grains/m³
🌿 Common Ragweed	HIGH	15 grains/m³
🌿 Mugwort	MED	10 grains/m³
🌾 Perennial Ryegrass	MED	8 grains/m³
🌾 Grass (mixed)	MED	8 grains/m³
+35 more tracked Cock's-foot Timothy Grass Sagebrush Stinging Nettle Fat Hen Russian Thistle Pigweed 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	20 grains/m³
🌿 Common Ragweed	HIGH	17 grains/m³
🌿 Mugwort	MED	12 grains/m³
🌿 Sagebrush	MED	7 grains/m³
🌿 Russian Thistle	MED	6 grains/m³
+35 more tracked Stinging Nettle Pigweed Western Ragweed Fat Hen Cock's-foot Perennial Ryegrass Timothy Grass Ribwort Plantain 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
🌿 Giant Ragweed	MED	12 grains/m³
🌿 Common Ragweed	MED	10 grains/m³
🌿 Mugwort	MED	7 grains/m³
🌿 Sagebrush	LOW	4 grains/m³
🌿 Stinging Nettle	LOW	4 grains/m³
+35 more tracked Pigweed Western Ragweed Fat Hen Ribwort Plantain Russian Thistle 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	MED

Map of Greenwich (51.475803°, 0.108329°)

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