Name: Pollen forecast for St. Louis (2026-09-07)
Creator: Pollen Count
Published: 2026-09-07T16:34:28Z
License: https://pollencount.org/terms/

The pollen count in St. Louis today is X.HI, driven mainly by Giant Ragweed.

X.HI

17 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 LOW

Tree LOW

Weed MED

Afternoon

Grass MED

Tree LOW

Weed X.HI

Evening

Grass MED

Tree LOW

Weed X.HI

Species	Level	Count
🌿 Giant Ragweed	X.HI	60 grains/m³
🌿 Western Ragweed	HIGH	28 grains/m³
🌿 Common Ragweed	MED	14 grains/m³
🌾 Grass (mixed)	MED	14 grains/m³
🌿 Mugwort	MED	13 grains/m³
+35 more tracked Cock's-foot Perennial Ryegrass Bermuda Grass Pellitory-of-the-wall Upright Pellitory Timothy Grass Russian Thistle Pigweed Fat Hen Ribwort Plantain Stinging Nettle Common Sorrel Box Elder Alder Sagebrush Paper Birch Silver Birch Downy Birch Australian Pine Japanese Cypress Hazel Japanese Cedar Mediterranean Cypress 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	X.HI	81 grains/m³
🌿 Western Ragweed	V.HI	37 grains/m³
🌾 Grass (mixed)	HIGH	26 grains/m³
🌾 Cock's-foot	HIGH	23 grains/m³
🌾 Perennial Ryegrass	HIGH	22 grains/m³
+35 more tracked Common Ragweed Mugwort Bermuda Grass Timothy Grass Pellitory-of-the-wall Upright Pellitory Fat Hen Russian Thistle Pigweed Ribwort Plantain Stinging Nettle Common Sorrel Box Elder Alder Sagebrush Paper Birch Silver Birch Downy Birch Australian Pine Japanese Cypress Hazel Japanese Cedar Mediterranean Cypress 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	40 grains/m³
🌿 Western Ragweed	HIGH	18 grains/m³
🌾 Grass (mixed)	MED	10 grains/m³
🌿 Common Ragweed	MED	9 grains/m³
🌿 Mugwort	MED	9 grains/m³
+35 more tracked Cock's-foot Perennial Ryegrass Bermuda Grass Pellitory-of-the-wall Upright Pellitory Timothy Grass Fat Hen Russian Thistle Pigweed Ribwort Plantain Stinging Nettle Common Sorrel Box Elder Alder Sagebrush Paper Birch Silver Birch Downy Birch Australian Pine Japanese Cypress Hazel Japanese Cedar Mediterranean Cypress 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	X.HI	67 grains/m³
🌿 Western Ragweed	V.HI	31 grains/m³
🌿 Common Ragweed	HIGH	15 grains/m³
🌿 Mugwort	HIGH	15 grains/m³
🌾 Grass (mixed)	MED	12 grains/m³
+35 more tracked Pellitory-of-the-wall Cock's-foot Perennial Ryegrass Upright Pellitory Pigweed Fat Hen Bermuda Grass Timothy Grass Russian Thistle Ribwort Plantain Stinging Nettle Common Sorrel Box Elder Alder Sagebrush Paper Birch Silver Birch Downy Birch Australian Pine Japanese Cypress Hazel Japanese Cedar Mediterranean Cypress 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	MED	X.HI
Tue 8 Sep	LOW	HIGH	X.HI
Wed 9 Sep	LOW	MED	V.HI
Thu 10 Sep	LOW	MED	X.HI

Map of St. Louis (38.627°, -90.1994°)

More in United States

Atlanta Austin Baltimore Boston Buffalo Charlotte

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