Dr. Alice Chau
Seattle Children’s Hospital
Seattle, WA · Puget Sound marine climate
Seattle, WA Pollen Count Today
Seattle allergy risk is shaped by Puget Sound marine air, rain breaks, abundant alder and birch pollen, neighborhood tree canopy, parks, and a summer grass season that can surge after dry stretches.
Today's pollen count in Seattle
Today in Seattle, Washington, the forecasted pollen level is moderate with an allergy index of 3. The primary allergen is Ragweed. Use the forecast below to see whether conditions are likely to rise, ease, or stay steady over the next few days.
AllergyAva shows forecasted pollen levels and allergy risk estimates for Seattle. Actual exposure can vary by neighborhood, weather, and time outdoors.
Pollen Level
Moderate Risk3
Google UPI (0–5)
Primary Allergen
Ragweed
Consider taking antihistamines before heading outside. Keep windows closed.
61°
Temp
87%
Humidity
2
Wind mph
Pollen: Includes data from Google Maps · Weather: Includes data from Google Maps
5-Day Pollen Forecast
Best day this week
Today - Moderate
Worst day this week
Fri - High
Today
84°/61°
3
Moderate
Tree0
Grass0
Weed3
Tomorrow
84°/61°
3
Moderate
Tree0
Grass0
Weed3
Thu
84°/61°
3
Moderate
Tree0
Grass0
Weed3
Fri
87°/63°
4
High
Tree0
Grass0
Weed4
Sat
84°/61°
3
Moderate
Tree0
Grass0
Weed3
None
Very Low
Low
Moderate
High
Very High
Allergen Breakdown
Ragweed
Moderate
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Weather-allergy synergy
Why conditions feel this way today
Today in Seattle, 87% humidity may keep irritation noticeable, especially if ragweed pollen overlaps with damp-weather mold sensitivity.
- Temp
- 61°F
- Humidity
- 87%
- Wind
- 2 mph
- Rain chance
- 10%
Experimental precipitation nowcast
Next 6 hours in Seattle
Rest of today — planning estimate
Better
Short outdoor plans are more reasonable today, especially away from active vegetation.
Avoid
Extended exposure near mowing, leaf litter, or heavy tree cover if those trigger symptoms.
Extra caution
Check tomorrow's trend before planning longer outdoor time.
Data Confidence & Sources
Pollen Forecast
- Source
- Includes data from Google Maps · Pollen API (1×1 km grid resolution)
- Last Daily Update
Pollen models recalculate once daily
Weather Conditions
- Source
- Includes data from Google Maps · Weather API
- Last Refresh
Weather data updates every 15–30 minutes
Local pollen exposure can vary by micro-vegetation, wind gusts, structural barriers, and time spent outdoors.
Check pollen in another city or ZIP code
Local allergy care
Allergists near Seattle, WA
Use today's pollen forecast alongside nearby allergy and immunology profiles when symptoms need clinical follow-up, testing, or long-term treatment planning.
Dr. Karin Chen
Seattle Children’s Hospital
Dr. Lauren Gunderman
Seattle Children’s Hospital
Showing 3 of 6 published allergist profiles in this area.
City allergy guide
Seattle allergy profile
Today's risk+
Seattle's pollen pattern is different from drier inland Washington because western Washington combines mild marine weather, frequent moisture, dense vegetation, and long green-up periods. Alder and cedar can start the season early during mild late-winter weather, followed by maple, cottonwood, birch, and other spring trees.
Rain often gives temporary relief while it is falling, but it also supports vigorous plant growth. When several dry or breezy days follow, pollen can rise quickly around parks, street trees, residential landscaping, lakefront paths, and open grass areas.
Seattle's guide sections below focus on recurring local exposure patterns. Today's moderate Ragweed reading is the live risk signal, while the seasonal and neighborhood notes explain where exposure can still differ during normal routines.
Seasonal guide+
December-January
Winter lull with indoor triggers
Outdoor pollen is usually lower, though indoor mold, dust mites, pets, and unusually mild early tree activity can still affect symptoms.
February-May
Early tree pollen season
Alder, cedar or juniper, maple, cottonwood, and birch can overlap in western Washington during mild, damp-to-dry spring transitions.
May-August
Grass pollen surge
Lawns, parks, athletic fields, roadsides, and open areas around Puget Sound can drive summer symptoms after spring growth dries out.
June-October
Weeds and damp-weather mold
Plantain, dock, sorrel, and other weeds can contribute, while moisture and leaf litter can keep mold irritation relevant.
Treatment and planning tips+
Rain timing
Use rain as a short-term planning clue, but watch for pollen rebound after a dry, breezy stretch follows wet weather.
Runs and walks
Lake paths, parks, and tree-lined routes may feel worse during spring tree pollen or summer grass peaks.
Home air
Avoid airing out rooms during high-pollen windows, even when cool marine air makes open windows tempting.
Seattle seasonal pollen calendar
Winter lull with indoor triggers
December-January
Outdoor pollen is usually lower, though indoor mold, dust mites, pets, and unusually mild early tree activity can still affect symptoms.
Early tree pollen season
February-May
Alder, cedar or juniper, maple, cottonwood, and birch can overlap in western Washington during mild, damp-to-dry spring transitions.
Grass pollen surge
May-August
Lawns, parks, athletic fields, roadsides, and open areas around Puget Sound can drive summer symptoms after spring growth dries out.
Weeds and damp-weather mold
June-October
Plantain, dock, sorrel, and other weeds can contribute, while moisture and leaf litter can keep mold irritation relevant.
Common pollen triggers around Seattle
| Trigger | Typical season | What to know |
|---|---|---|
| Tree pollen | Spring | Often drives early-season symptoms |
| Grass pollen | Late spring to summer | Can rise around lawns, parks, and open areas |
| Ragweed/weed pollen | Late summer to fall | Major fall allergy trigger |
| Mold spores | Varies | Often affected by moisture and decaying leaves |
Local exposure factors
Seattle's Puget Sound allergy factors
These local factors explain recurring exposure differences around Seattle; the current index, primary allergen, and weather cards above remain the canonical source for today's live reading.
Rain breaks and pollen rebound
Showers can wash pollen down temporarily, but dry periods after rain can allow trees and grasses to release accumulated pollen.
Dense urban tree canopy
Street trees, residential landscaping, ravines, and parks can make tree pollen noticeable even in highly urban neighborhoods.
Parks, lakes, and open grass
Green Lake, Lake Washington paths, athletic fields, and grassy parks can increase grass exposure during late spring and summer.
Marine air and neighborhood variation
Sound-facing areas, hilltop neighborhoods, and inland valleys can feel different as wind direction and moisture shift through the day.
Frequently asked questions about pollen in Seattle
What is the pollen count in Seattle today?
Today in Seattle, Washington, the pollen level is moderate with an allergy index of 3. The main allergen to watch is Ragweed.
Why can Seattle pollen be high even after rainy weather?
Rain can lower airborne pollen while it is falling, but Seattle's moisture also supports strong plant growth. When dry or breezy weather follows, trees and grasses can release pollen quickly.
What months are worst for allergies in Seattle?
February through May is usually the main tree pollen window, May through August is important for grass pollen, and June through October can bring weeds plus damp-weather mold irritation.
Which pollen types affect Seattle most in spring?
Alder, cedar or juniper, maple, cottonwood, and birch are common spring contributors in the Puget Sound region, with birch becoming more noticeable as spring develops.
Why can Seattle pollen differ from Spokane?
The Cascades separate Seattle's marine climate from Spokane's drier inland pattern. The two areas warm differently, have different vegetation, and do not always peak at the same time.