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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.

HIGH

10 active species

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4-Day Forecast:

Morning

Grass LOW

Tree V.HI

Weed LOW

Afternoon

Grass LOW

Tree HIGH

Weed LOW

Evening

Grass LOW

Tree MED

Weed LOW

Species	Level	Count
🌳 Downy Birch	HIGH	84 grains/m³
🌳 Paper Birch	HIGH	77 grains/m³
🌳 Silver Birch	HIGH	74 grains/m³
🌳 English Oak	HIGH	65 grains/m³
🌳 White Oak	MED	45 grains/m³
+35 more tracked Holm Oak London Plane Black Poplar Box Elder Ash Alder Pigweed Common Ragweed Western Ragweed Giant Ragweed Sagebrush Mugwort Australian Pine Japanese Cypress Fat Hen Hazel Japanese Cedar Mediterranean Cypress Bermuda Grass Cock's-foot Mountain Cedar Perennial Ryegrass White Mulberry Olive Pellitory-of-the-wall Upright Pellitory Parthenium Weed Timothy Grass Ribwort Plantain Grass (mixed) Mesquite Common Sorrel Russian Thistle Field Elm Stinging Nettle All species in the app: Android iOS
🌳 Downy Birch	V.HI	158 grains/m³
🌳 Paper Birch	V.HI	145 grains/m³
🌳 Silver Birch	V.HI	139 grains/m³
🌳 English Oak	V.HI	123 grains/m³
🌳 White Oak	HIGH	84 grains/m³
+35 more tracked Holm Oak London Plane Black Poplar Box Elder Ash Alder Pigweed Common Ragweed Western Ragweed Giant Ragweed Sagebrush Mugwort Australian Pine Japanese Cypress Fat Hen Hazel Japanese Cedar Mediterranean Cypress Bermuda Grass Cock's-foot Mountain Cedar Perennial Ryegrass White Mulberry Olive Pellitory-of-the-wall Upright Pellitory Parthenium Weed Timothy Grass Ribwort Plantain Grass (mixed) Mesquite Common Sorrel Russian Thistle Field Elm Stinging Nettle All species in the app: Android iOS
🌳 Downy Birch	V.HI	194 grains/m³
🌳 Paper Birch	V.HI	178 grains/m³
🌳 Silver Birch	V.HI	171 grains/m³
🌳 English Oak	V.HI	151 grains/m³
🌳 White Oak	V.HI	103 grains/m³
+35 more tracked Holm Oak London Plane Box Elder Black Poplar Ash Alder Pigweed Common Ragweed Western Ragweed Giant Ragweed Sagebrush Mugwort Australian Pine Japanese Cypress Fat Hen Hazel Japanese Cedar Mediterranean Cypress Bermuda Grass Cock's-foot Mountain Cedar Perennial Ryegrass White Mulberry Olive Pellitory-of-the-wall Upright Pellitory Parthenium Weed Timothy Grass Ribwort Plantain Grass (mixed) Mesquite Common Sorrel Russian Thistle Field Elm Stinging Nettle All species in the app: Android iOS
🌳 Downy Birch	V.HI	102 grains/m³
🌳 Paper Birch	HIGH	93 grains/m³
🌳 Silver Birch	HIGH	90 grains/m³
🌳 English Oak	HIGH	79 grains/m³
🌳 White Oak	HIGH	54 grains/m³
+35 more tracked Holm Oak London Plane Box Elder Black Poplar Ash Alder Pigweed Common Ragweed Western Ragweed Giant Ragweed Sagebrush Mugwort Australian Pine Japanese Cypress Fat Hen Hazel Japanese Cedar Mediterranean Cypress Bermuda Grass Cock's-foot Mountain Cedar Perennial Ryegrass White Mulberry Olive Pellitory-of-the-wall Upright Pellitory Parthenium Weed Timothy Grass Ribwort Plantain Grass (mixed) Mesquite Common Sorrel Russian Thistle Field Elm Stinging Nettle All species in the app: Android iOS

Last updated: 14:03 UTC

4-Day Forecast	Tree	Grass	Weed
Wed 20 May	HIGH	LOW	LOW
Thu 21 May	V.HI	LOW	LOW
Fri 22 May	V.HI	LOW	LOW
Sat 23 May	V.HI	LOW	LOW

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