Name: Pollen forecast for Swansea (2026-09-01)
Creator: Pollen Count
Published: 2026-09-01T15:30:44Z
License: https://pollencount.org/terms/

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About Pollen in Swansea

Swansea’s spring allergy profile is dominated by tree pollen: Hazel and Alder from late winter; Birch and Oak peak late spring, originating from Singleton Park, Clyne Gardens, and urban street trees. Mid-spring to mid-summer sees high Grass pollen counts, prevalent from Swansea Bay’s expansive foreshore, Tawe/Clyne riverbanks, and surrounding local meadows.

Swansea’s coastal-valley topography significantly influences pollen levels; prevailing westerly winds can disperse or concentrate airborne allergens, notably in sheltered areas like the Clyne Valley. Autumn brings increased Mould spore counts, exacerbated by high local humidity, decaying vegetation in woodland areas like Kilvey Hill, and damp urban environments.

The pollen count in Swansea today is HIGH, driven mainly by Giant Ragweed.

HIGH

15 active species

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4-Day Forecast:

Morning

Grass MED

Tree LOW

Weed MED

Afternoon

Grass MED

Tree LOW

Weed HIGH

Evening

Grass LOW

Tree LOW

Weed MED

Species	Level	Count
🌿 Giant Ragweed	HIGH	22 grains/m³
🌿 Common Ragweed	HIGH	18 grains/m³
🌿 Mugwort	MED	13 grains/m³
🌾 Cock's-foot	MED	8 grains/m³
🌾 Timothy Grass	MED	8 grains/m³
+35 more tracked Grass (mixed) Perennial Ryegrass Stinging Nettle Pigweed Fat Hen Ribwort Plantain Russian Thistle Western Ragweed 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
🌿 Giant Ragweed	HIGH	20 grains/m³
🌿 Common Ragweed	HIGH	17 grains/m³
🌿 Mugwort	MED	12 grains/m³
🌿 Stinging Nettle	MED	6 grains/m³
🌿 Fat Hen	MED	5 grains/m³
+35 more tracked Pigweed Western Ragweed Cock's-foot Timothy Grass Ribwort Plantain Grass (mixed) Common Sorrel Russian Thistle Sagebrush Perennial Ryegrass 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	24 grains/m³
🌿 Common Ragweed	HIGH	20 grains/m³
🌿 Mugwort	MED	14 grains/m³
🌿 Stinging Nettle	MED	7 grains/m³
🌿 Pigweed	MED	6 grains/m³
+35 more tracked Fat Hen Timothy Grass Ribwort Plantain Grass (mixed) Western Ragweed Cock's-foot Perennial Ryegrass Russian Thistle 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
🌿 Giant Ragweed	HIGH	23 grains/m³
🌿 Common Ragweed	HIGH	19 grains/m³
🌿 Mugwort	MED	13 grains/m³
🌾 Cock's-foot	MED	8 grains/m³
🌾 Timothy Grass	MED	8 grains/m³
+35 more tracked Grass (mixed) Perennial Ryegrass Stinging Nettle Fat Hen Pigweed Ribwort Plantain Russian Thistle Western Ragweed 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	HIGH
Wed 2 Sep	LOW	LOW	HIGH
Thu 3 Sep	LOW	MED	HIGH
Fri 4 Sep	LOW	MED	HIGH

Map of Swansea (51.622099°, -3.876958°)

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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