Name: Pollen forecast for Winchester (2026-09-01)
Creator: Pollen Count
Published: 2026-09-01T15:30:47Z
License: https://pollencount.org/terms/

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About Pollen in Winchester

Winchester experiences peak spring pollen from Birch (March-April), prevalent in urban parks like Abbey Gardens and Oram’s Arbour, followed by Oak (April-May) from surrounding South Downs woodlands; summer sees high Grass pollen (May-July) across River Itchen floodplains and water meadows such as Winnall Moors.

The city’s valley topography can trap pollen, exacerbating levels; autumn/winter bring mould spores (September-February) from damp, decaying leaves in woodlands and riverine areas.

The pollen count in Winchester today is V.HI, driven mainly by Mugwort.

V.HI

15 active species

Refreshing live forecast…

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4-Day Forecast:

Morning

Grass MED

Tree LOW

Weed MED

Afternoon

Grass MED

Tree LOW

Weed V.HI

Evening

Grass LOW

Tree LOW

Weed HIGH

Species	Level	Count
🌿 Mugwort	V.HI	34 grains/m³
🌿 Giant Ragweed	HIGH	27 grains/m³
🌿 Common Ragweed	HIGH	22 grains/m³
🌾 Grass (mixed)	MED	11 grains/m³
🌾 Perennial Ryegrass	MED	10 grains/m³
+35 more tracked Cock's-foot Timothy Grass Russian Thistle Stinging Nettle Western Ragweed Pigweed Fat Hen Ribwort Plantain Sagebrush 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	33 grains/m³
🌿 Giant Ragweed	HIGH	26 grains/m³
🌿 Common Ragweed	HIGH	22 grains/m³
🌾 Grass (mixed)	MED	13 grains/m³
🌾 Perennial Ryegrass	MED	11 grains/m³
+35 more tracked Timothy Grass Cock's-foot Russian Thistle Stinging Nettle Western Ragweed Pigweed Fat Hen Ribwort Plantain Sagebrush 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	35 grains/m³
🌿 Giant Ragweed	HIGH	28 grains/m³
🌿 Common Ragweed	HIGH	24 grains/m³
🌾 Grass (mixed)	MED	8 grains/m³
🌿 Russian Thistle	MED	8 grains/m³
+35 more tracked Stinging Nettle Western Ragweed Fat Hen Perennial Ryegrass Timothy Grass Pigweed Cock's-foot Ribwort Plantain Sagebrush 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	30 grains/m³
🌿 Giant Ragweed	HIGH	24 grains/m³
🌿 Common Ragweed	HIGH	20 grains/m³
🌿 Russian Thistle	MED	7 grains/m³
🌿 Stinging Nettle	MED	7 grains/m³
+35 more tracked Pigweed Western Ragweed Fat Hen Ribwort Plantain Grass (mixed) Sagebrush Cock's-foot Perennial Ryegrass 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	V.HI
Wed 2 Sep	LOW	MED	V.HI
Thu 3 Sep	LOW	MED	V.HI
Fri 4 Sep	LOW	MED	V.HI

Map of Winchester (51.063997°, -1.325058°)

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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