Name: Pollen forecast for Harrow (2026-10-17)
Creator: Pollen Count
Published: 2026-10-17T14:18:20Z
License: https://pollencount.org/terms/

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About Pollen in Harrow

Harrow’s allergy profile sees dominant spring Birch and Oak pollen (March-May), sourced from extensive woodlands at Bentley Priory Nature Reserve and Harrow Weald Common; followed by peak summer Grass pollen (June-August) from local playing fields and River Pinn’s marginal meadows.

Topography, including Harrow Hill’s elevation and sheltered suburban parks, can localise and intensify pollen concentrations; late-season mould spores (Sept-Nov) elevate from damp leaf decomposition in parklands and shaded urban areas.

The pollen count in Harrow today is moderate, driven mainly by Mugwort.

MED

13 active species

Refreshing live forecast…

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4-Day Forecast:

Morning

Grass MED

Tree LOW

Weed LOW

Afternoon

Grass MED

Tree LOW

Weed MED

Evening

Grass LOW

Tree LOW

Weed MED

Species	Level	Count
🌿 Mugwort	MED	6 grains/m³
🌾 Perennial Ryegrass	MED	6 grains/m³
🌾 Timothy Grass	MED	6 grains/m³
🌾 Grass (mixed)	MED	6 grains/m³
🌿 Sagebrush	MED	5 grains/m³
+35 more tracked Cock's-foot Western Ragweed Pigweed Fat Hen Russian Thistle Stinging Nettle 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	6 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 Sagebrush Western Ragweed Pigweed Fat Hen Russian Thistle Stinging Nettle 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	11 grains/m³
🌿 Sagebrush	MED	8 grains/m³
🌿 Western Ragweed	MED	7 grains/m³
🌾 Perennial Ryegrass	MED	7 grains/m³
🌾 Timothy Grass	MED	7 grains/m³
+35 more tracked Grass (mixed) Cock's-foot Stinging Nettle Pigweed Fat Hen Russian Thistle 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	8 grains/m³
🌿 Western Ragweed	MED	6 grains/m³
🌿 Sagebrush	MED	6 grains/m³
🌿 Pigweed	LOW	4 grains/m³
🌿 Fat Hen	LOW	4 grains/m³
+35 more tracked Russian Thistle Stinging Nettle Cock's-foot Perennial Ryegrass Timothy Grass Ribwort Plantain Grass (mixed) 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

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 Harrow (51.633972°, -0.304218°)

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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