Name: Pollen forecast for Watford (2026-09-01)
Creator: Pollen Count
Published: 2026-09-01T15:30:46Z
License: https://pollencount.org/terms/

🌿

About Pollen in Watford

Watford’s allergy profile sees peak tree pollen activity March-May; Birch and Oak are dominant, originating from Cassiobury Park’s extensive woodlands and Oxhey Park’s mature tree lines; Grass pollen peaks May-July, widely dispersed from Watford Fields, River Colne riverbanks, and residential lawns.

The urban-suburban interface, particularly near Watford Junction, can create pollen traps; River Colne valley topography influences localised pollen distribution; late-season mould spores (Sept-Nov) derive from decaying leaf litter in Whippendell Woods and widespread damp domestic environments.

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

HIGH

15 active species

Refreshing live forecast…

.forecast-refresh-status{display:none!important}.date-tab{cursor:default;opacity:.55}Showing today's cached forecast. Enable JavaScript to switch days and load live data.

4-Day Forecast:

Morning

Grass MED

Tree LOW

Weed MED

Afternoon

Grass MED

Tree LOW

Weed HIGH

Evening

Grass LOW

Tree LOW

Weed HIGH

Species	Level	Count
🌿 Giant Ragweed	HIGH	15 grains/m³
🌿 Common Ragweed	MED	12 grains/m³
🌿 Mugwort	MED	11 grains/m³
🌾 Cock's-foot	MED	7 grains/m³
🌾 Perennial Ryegrass	MED	7 grains/m³
+35 more tracked Timothy Grass Grass (mixed) Sagebrush Stinging Nettle Pigweed Fat Hen Russian Thistle 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
🌿 Giant Ragweed	HIGH	20 grains/m³
🌿 Common Ragweed	HIGH	17 grains/m³
🌿 Mugwort	HIGH	16 grains/m³
🌾 Perennial Ryegrass	MED	11 grains/m³
🌾 Timothy Grass	MED	11 grains/m³
+35 more tracked Grass (mixed) Cock's-foot Sagebrush Russian Thistle Stinging Nettle Pigweed Western Ragweed Fat Hen 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
🌿 Giant Ragweed	HIGH	20 grains/m³
🌿 Common Ragweed	HIGH	17 grains/m³
🌿 Mugwort	HIGH	15 grains/m³
🌿 Sagebrush	MED	6 grains/m³
🌾 Perennial Ryegrass	MED	6 grains/m³
+35 more tracked Grass (mixed) Stinging Nettle Pigweed Fat Hen Cock's-foot Timothy Grass Ribwort Plantain Russian Thistle Western Ragweed 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	MED	13 grains/m³
🌿 Common Ragweed	MED	11 grains/m³
🌿 Mugwort	MED	10 grains/m³
🌿 Sagebrush	LOW	4 grains/m³
🌿 Russian Thistle	LOW	4 grains/m³
+35 more tracked Stinging Nettle Pigweed Western Ragweed Fat Hen Ribwort Plantain Cock's-foot Perennial Ryegrass Timothy Grass 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	HIGH
Wed 2 Sep	LOW	MED	HIGH
Thu 3 Sep	LOW	MED	HIGH
Fri 4 Sep	LOW	LOW	MED

Map of Watford (51.61624°, -0.382634°)

More in United Kingdom

Aberdeen Ashford Aylesbury Banbury Barking and Dagenham Barnet

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