Dr. Edward Murphy
Memorial Specialty Care ENT & Allergy Clinic
Decatur, IL · Illinois
Decatur, IL Pollen Count Today
View today's allergy index, primary allergen, weather context, tree, grass, and weed pollen levels, plus the 5-day pollen forecast for Decatur.
Today's pollen count in Decatur
Today in Decatur, Illinois, 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 Decatur. Actual exposure can vary by neighborhood, weather, and time outdoors.
Pollen Level
Moderate Risk3
Planning estimate (0–5)
Primary Allergen
Ragweed
Consider taking antihistamines before heading outside. Keep windows closed.
79°
Temp
74%
Humidity
15
Wind mph
Pollen: AllergyAva seasonal estimate · Weather: AllergyAva estimated fallback
5-Day Pollen Forecast
Best day this week
Thu - Low
Worst day this week
Fri - Very High
Today
76°/46°
3
Moderate
Tree0
Grass0
Weed3
Tomorrow
86°/62°
4
High
Tree0
Grass2
Weed4
Wed
81°/57°
4
High
Tree0
Grass0
Weed4
Thu
73°/54°
2
Low
Tree0
Grass1
Weed2
Fri
91°/56°
5
Very High
Tree0
Grass0
Weed5
None
Very Low
Low
Moderate
High
Very High
Allergen Breakdown
Ragweed
Moderate
Mugwort
Moderate
Grass
None
Oak
None
Ava Personal Risk
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Weather-allergy synergy
Why conditions feel this way today
Today in Decatur, 74% humidity may keep irritation noticeable, especially if ragweed pollen overlaps with damp-weather mold sensitivity.
- Temp
- 79°F
- Humidity
- 74%
- Wind
- 15 mph
- Rain chance
- 17%
24-hour allergy risk curve
Best outdoor window today in Decatur
Better
No clearly better outdoor window while alerts, storm risk, or strong wind are present.
Avoid
Storm periods, gust fronts, and exposed outdoor areas.
Extra caution
Stay indoors during storms, especially if pollen or asthma affects your breathing.
Data Confidence & Sources
Pollen Forecast
- Source
- AllergyAva seasonal planning estimate
- Last Daily Update
Pollen models recalculate once daily
Weather Conditions
- Source
- AllergyAva estimated weather fallback
- 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 Decatur, IL
Use today's pollen forecast alongside nearby allergy and immunology profiles when symptoms need clinical follow-up, testing, or long-term treatment planning.
City allergy guide
Decatur allergy profile
Today's risk+
Decatur allergy conditions are shaped by local weather, seasonal vegetation, and short-term changes in wind, rain, humidity, and temperature. Tree pollen is usually more important in spring, grass pollen often builds from late spring into summer, and weed pollen can become more noticeable later in the year.
Use today's pollen index alongside the 5-day forecast to plan commutes, outdoor exercise, yard work, and window-open time in Decatur. Conditions can still vary by neighborhood, nearby plants, and time spent outdoors.
Decatur'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+
Spring
Tree pollen
Often drives early-season symptoms
Late spring to summer
Grass pollen
Can rise around lawns, parks, and open areas
Late summer to fall
Ragweed/weed pollen
Major fall allergy trigger
Varies
Mold spores
Often affected by moisture and decaying leaves
Treatment and planning tips+
Track the forecast
Check Decatur pollen levels daily during active allergy periods.
Reduce indoor exposure
Keep windows closed on high-pollen days and use HVAC or HEPA filtration when appropriate.
Plan medication timing
Follow your clinician's or product-label instructions, especially before your usual peak season.
Decatur seasonal pollen calendar
Tree pollen
Spring
Often drives early-season symptoms
Grass pollen
In season nowLate spring to summer
Can rise around lawns, parks, and open areas
Ragweed/weed pollen
In season nowLate summer to fall
Major fall allergy trigger
Mold spores
Varies
Often affected by moisture and decaying leaves
Common pollen triggers around Decatur
| 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 |
Frequently asked questions about pollen in Decatur
What is the pollen count in Decatur today?
Today in Decatur, Illinois, the pollen level is moderate with an allergy index of 3. The main allergen to watch is Ragweed.
When is allergy season in Decatur, Illinois?
Allergy season in Decatur, Illinois can vary by allergen and weather conditions. Tree pollen often rises in spring, grass pollen becomes more active in late spring and summer, and weed pollen can remain elevated later in the year depending on local climate and vegetation.
How often should I check the pollen forecast in Decatur?
If you have seasonal allergies in Decatur, it is helpful to check the pollen forecast daily during peak allergy periods. Shifts in wind, rainfall, temperature, and humidity can all change local pollen exposure from one day to the next.
What pollen types affect people in Decatur, Illinois?
Decatur residents may be affected by tree pollen, grass pollen, and weed pollen during different parts of the year. The strongest trigger depends on the season, nearby vegetation, and current weather conditions.