Name: Pollen forecast for Portsmouth (2026-09-01)
Creator: Pollen Count
Published: 2026-09-01T15:30:39Z
License: https://pollencount.org/terms/

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About Pollen in Portsmouth

Portsmouth’s March-May spring allergy peak features Birch and Oak pollen from urban green spaces like Victoria Park and Southsea Common; May-July summer sees significant Grass pollen release from coastal meadows including Farlington Marshes and extensive areas of Southsea Common.

The city’s exposed coastal geography, particularly prevailing south-westerly winds across The Solent, influences pollen distribution; however, urban layouts can locally concentrate airborne allergens; autumn-winter brings Mould spore allergies, sourced from damp leaf litter decomposition in parks and shaded coastal areas.

The pollen count in Portsmouth today is V.HI, driven mainly by Giant Ragweed.

V.HI

15 active species

Refreshing live forecast…

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4-Day Forecast:

Morning

Grass MED

Tree LOW

Weed HIGH

Afternoon

Grass MED

Tree LOW

Weed V.HI

Evening

Grass LOW

Tree LOW

Weed HIGH

Species	Level	Count
🌿 Giant Ragweed	V.HI	40 grains/m³
🌿 Common Ragweed	V.HI	33 grains/m³
🌿 Mugwort	HIGH	26 grains/m³
🌾 Perennial Ryegrass	MED	16 grains/m³
🌾 Grass (mixed)	MED	16 grains/m³
+35 more tracked Cock's-foot Timothy Grass Stinging Nettle Western Ragweed Fat Hen Russian Thistle Pigweed Ribwort Plantain Common Sorrel Sagebrush 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	V.HI	30 grains/m³
🌿 Common Ragweed	HIGH	26 grains/m³
🌿 Mugwort	HIGH	20 grains/m³
🌾 Grass (mixed)	MED	11 grains/m³
🌾 Cock's-foot	MED	10 grains/m³
+35 more tracked Perennial Ryegrass Timothy Grass Stinging Nettle Western Ragweed Russian Thistle Pigweed Fat Hen Ribwort Plantain Common Sorrel Sagebrush 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	29 grains/m³
🌿 Common Ragweed	HIGH	24 grains/m³
🌿 Mugwort	HIGH	19 grains/m³
🌿 Western Ragweed	MED	8 grains/m³
🌿 Stinging Nettle	MED	8 grains/m³
+35 more tracked Pigweed Fat Hen Russian Thistle Cock's-foot Perennial Ryegrass Timothy Grass Ribwort Plantain Grass (mixed) Common Sorrel Sagebrush 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	27 grains/m³
🌿 Common Ragweed	HIGH	23 grains/m³
🌿 Mugwort	HIGH	18 grains/m³
🌿 Stinging Nettle	MED	8 grains/m³
🌿 Western Ragweed	MED	7 grains/m³
+35 more tracked Perennial Ryegrass Timothy Grass Grass (mixed) Russian Thistle Pigweed Fat Hen 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

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	HIGH
Fri 4 Sep	LOW	MED	HIGH

Map of Portsmouth (50.846325°, -1.12974°)

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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