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

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About Pollen in Windsor

Windsor’s spring allergy profile peaks March-May with high tree pollen; Birch, Oak, and Hornbeam dominate from Windsor Great Park and Home Park’s mature woodlands. Summer transitions to significant grass pollen (May-July), originating from the extensive riverside meadows and Thames embankments.

The Thames Valley’s sheltered topography and enclosed green spaces, like Alexandra Gardens, can concentrate pollen, intensifying local airborne allergen exposure. Autumn (September-November) brings elevated mould spore counts, driven by decomposing leaf litter within forested areas and persistent riverside humidity.

The pollen count in Windsor today is X.HI, driven mainly by Mugwort.

X.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 X.HI

Evening

Grass MED

Tree LOW

Weed X.HI

Species	Level	Count
🌿 Mugwort	X.HI	52 grains/m³
🌿 Giant Ragweed	V.HI	40 grains/m³
🌿 Common Ragweed	V.HI	34 grains/m³
🌿 Sagebrush	HIGH	19 grains/m³
🌿 Russian Thistle	MED	12 grains/m³
+35 more tracked Stinging Nettle Pigweed Fat Hen Grass (mixed) Western Ragweed Cock's-foot Perennial Ryegrass 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
🌿 Mugwort	X.HI	55 grains/m³
🌿 Giant Ragweed	V.HI	42 grains/m³
🌿 Common Ragweed	V.HI	36 grains/m³
🌾 Grass (mixed)	HIGH	24 grains/m³
🌾 Perennial Ryegrass	HIGH	21 grains/m³
+35 more tracked Sagebrush Cock's-foot Timothy Grass Russian Thistle Stinging Nettle Fat Hen 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
🌿 Mugwort	V.HI	33 grains/m³
🌿 Giant Ragweed	HIGH	25 grains/m³
🌿 Common Ragweed	HIGH	21 grains/m³
🌿 Sagebrush	MED	12 grains/m³
🌾 Grass (mixed)	MED	8 grains/m³
+35 more tracked Russian Thistle Stinging Nettle Perennial Ryegrass Pigweed Western Ragweed Fat Hen 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
🌿 Mugwort	HIGH	25 grains/m³
🌿 Giant Ragweed	HIGH	20 grains/m³
🌿 Common Ragweed	HIGH	17 grains/m³
🌿 Sagebrush	MED	10 grains/m³
🌿 Russian Thistle	MED	6 grains/m³
+35 more tracked Stinging Nettle Pigweed Fat Hen Western Ragweed 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

Last updated: 15:30 UTC

4-Day Forecast	Tree	Grass	Weed
Tue 1 Sep	LOW	MED	X.HI
Wed 2 Sep	LOW	HIGH	X.HI
Thu 3 Sep	LOW	MED	V.HI
Fri 4 Sep	LOW	LOW	HIGH

Map of Windsor (51.47729°, -0.63118°)

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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