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

The pollen count in San Francisco today is V.HI, driven mainly by Giant Ragweed.

V.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 LOW

Afternoon

Grass MED

Tree LOW

Weed V.HI

Evening

Grass HIGH

Tree LOW

Weed X.HI

Species	Level	Count
🌿 Giant Ragweed	V.HI	37 grains/m³
🌿 Western Ragweed	HIGH	23 grains/m³
🌾 Grass (mixed)	MED	15 grains/m³
🌿 Mugwort	MED	12 grains/m³
🌾 Bermuda Grass	MED	10 grains/m³
+35 more tracked Cock's-foot Sagebrush Pellitory-of-the-wall Perennial Ryegrass Fat Hen Upright Pellitory Timothy Grass Russian Thistle Pigweed Ribwort Plantain Stinging Nettle Common Sorrel Box Elder Alder Common Ragweed 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	71 grains/m³
🌿 Western Ragweed	V.HI	44 grains/m³
🌾 Grass (mixed)	HIGH	32 grains/m³
🌿 Mugwort	HIGH	23 grains/m³
🌾 Bermuda Grass	HIGH	22 grains/m³
+35 more tracked Cock's-foot Sagebrush Pellitory-of-the-wall Perennial Ryegrass Timothy Grass Upright Pellitory Russian Thistle Fat Hen Pigweed Ribwort Plantain Stinging Nettle Common Sorrel Box Elder Alder Common Ragweed 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	180 grains/m³
🌿 Western Ragweed	X.HI	111 grains/m³
🌾 Grass (mixed)	V.HI	80 grains/m³
🌿 Mugwort	X.HI	59 grains/m³
🌾 Cock's-foot	HIGH	56 grains/m³
+35 more tracked Bermuda Grass Sagebrush Pellitory-of-the-wall Perennial Ryegrass Timothy Grass Russian Thistle Upright Pellitory Fat Hen Pigweed Ribwort Plantain Stinging Nettle Common Sorrel Box Elder Alder Common Ragweed 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	53 grains/m³
🌿 Western Ragweed	V.HI	33 grains/m³
🌾 Grass (mixed)	MED	18 grains/m³
🌿 Mugwort	HIGH	17 grains/m³
🌿 Sagebrush	MED	13 grains/m³
+35 more tracked Cock's-foot Bermuda Grass Pellitory-of-the-wall Upright Pellitory Russian Thistle Pigweed Fat Hen Perennial Ryegrass Timothy Grass Ribwort Plantain Stinging Nettle Common Sorrel Box Elder Alder Common Ragweed 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	V.HI
Tue 8 Sep	LOW	HIGH	X.HI
Wed 9 Sep	LOW	V.HI	X.HI
Thu 10 Sep	LOW	MED	X.HI

Map of San Francisco (37.7749°, -122.4194°)

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