Name: Pollen forecast for Portland (2026-09-07)
Creator: Pollen Count
Published: 2026-09-07T16:34:27Z
License: https://pollencount.org/terms/

The pollen count in Portland today is MED, driven mainly by Giant Ragweed.

MED

16 active species

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4-Day Forecast:

Morning

Grass LOW

Tree LOW

Weed LOW

Afternoon

Grass LOW

Tree LOW

Weed MED

Evening

Grass MED

Tree LOW

Weed V.HI

Species	Level	Count
🌿 Giant Ragweed	MED	10 grains/m³
🌿 Common Ragweed	MED	7 grains/m³
🌿 Western Ragweed	LOW	4 grains/m³
🌾 Grass (mixed)	LOW	4 grains/m³
🌿 Mugwort	LOW	3 grains/m³
+35 more tracked Cock's-foot Perennial Ryegrass Timothy Grass Pellitory-of-the-wall Upright Pellitory Pigweed Fat Hen Ribwort Plantain Common Sorrel Russian Thistle Stinging Nettle Box Elder Alder Sagebrush Paper Birch Silver Birch Downy Birch Australian Pine Japanese Cypress Hazel Japanese Cedar Mediterranean Cypress Bermuda Grass Ash Mountain Cedar White Mulberry Olive 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	19 grains/m³
🌿 Common Ragweed	MED	14 grains/m³
🌾 Perennial Ryegrass	MED	8 grains/m³
🌾 Grass (mixed)	MED	8 grains/m³
🌿 Western Ragweed	MED	7 grains/m³
+35 more tracked Cock's-foot Timothy Grass Mugwort Pellitory-of-the-wall Upright Pellitory Stinging Nettle Pigweed Fat Hen Ribwort Plantain Common Sorrel Russian Thistle Box Elder Alder Sagebrush Paper Birch Silver Birch Downy Birch Australian Pine Japanese Cypress Hazel Japanese Cedar Mediterranean Cypress Bermuda Grass Ash Mountain Cedar White Mulberry Olive 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	33 grains/m³
🌿 Common Ragweed	HIGH	25 grains/m³
🌾 Grass (mixed)	MED	15 grains/m³
🌾 Cock's-foot	MED	13 grains/m³
🌾 Perennial Ryegrass	MED	13 grains/m³
+35 more tracked Timothy Grass Western Ragweed Mugwort Pellitory-of-the-wall Upright Pellitory Stinging Nettle Pigweed Fat Hen Ribwort Plantain Russian Thistle Common Sorrel Box Elder Alder Sagebrush Paper Birch Silver Birch Downy Birch Australian Pine Japanese Cypress Hazel Japanese Cedar Mediterranean Cypress Bermuda Grass Ash Mountain Cedar White Mulberry Olive 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	16 grains/m³
🌿 Common Ragweed	MED	12 grains/m³
🌾 Grass (mixed)	MED	8 grains/m³
🌾 Perennial Ryegrass	MED	7 grains/m³
🌾 Timothy Grass	MED	7 grains/m³
+35 more tracked Western Ragweed Cock's-foot Mugwort Pellitory-of-the-wall Upright Pellitory Pigweed Fat Hen Ribwort Plantain Russian Thistle Stinging Nettle Common Sorrel Box Elder Alder Sagebrush Paper Birch Silver Birch Downy Birch Australian Pine Japanese Cypress Hazel Japanese Cedar Mediterranean Cypress Bermuda Grass Ash Mountain Cedar White Mulberry Olive Parthenium Weed London Plane Black Poplar Mesquite White Oak Holm Oak English Oak Field Elm All species in the app: Android iOS

Last updated: 16:34 UTC

4-Day Forecast	Tree	Grass	Weed
Mon 7 Sep	LOW	LOW	MED
Tue 8 Sep	LOW	MED	HIGH
Wed 9 Sep	LOW	MED	V.HI
Thu 10 Sep	LOW	MED	HIGH

Map of Portland (45.5152°, -122.6784°)

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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