Name: Pollen forecast for Portsmouth (2026-10-17)
Creator: Pollen Count
Published: 2026-10-17T14:18:27Z
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 moderate, driven mainly by Grass (mixed).

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 LOW

Species	Level	Count
🌾 Grass (mixed)	MED	9 grains/m³
🌾 Cock's-foot	MED	8 grains/m³
🌾 Perennial Ryegrass	MED	8 grains/m³
🌾 Timothy Grass	MED	8 grains/m³
🌿 Mugwort	MED	7 grains/m³
+35 more tracked Western Ragweed Russian Thistle Stinging Nettle Pigweed Fat Hen Ribwort Plantain Sagebrush 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
🌾 Perennial Ryegrass	MED	6 grains/m³
🌾 Timothy Grass	MED	6 grains/m³
🌾 Grass (mixed)	MED	6 grains/m³
🌾 Cock's-foot	MED	5 grains/m³
+35 more tracked Western Ragweed Fat Hen Russian Thistle Stinging Nettle Pigweed Ribwort Plantain Common Sorrel Sagebrush 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
🌾 Perennial Ryegrass	MED	8 grains/m³
🌾 Timothy Grass	MED	8 grains/m³
🌾 Grass (mixed)	MED	8 grains/m³
🌾 Cock's-foot	MED	7 grains/m³
+35 more tracked Pigweed Western Ragweed Fat Hen Russian Thistle Stinging Nettle Ribwort Plantain Common Sorrel Sagebrush 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
🌿 Western Ragweed	MED	6 grains/m³
🌿 Stinging Nettle	MED	6 grains/m³
🌿 Pigweed	MED	5 grains/m³
🌿 Fat Hen	MED	5 grains/m³
+35 more tracked Cock's-foot Perennial Ryegrass Timothy Grass Grass (mixed) Russian Thistle Ribwort Plantain Sagebrush 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	MED	MED

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