Sioux City, IA · Iowa

Sioux City, IA 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 Sioux City.

Primary trigger: BirchFalling16 mph wind

Today's pollen count in Sioux City

Today in Sioux City, Iowa, the forecasted pollen level is very high with an allergy index of 5. The primary allergen is Birch. 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 Sioux City. Actual exposure can vary by neighborhood, weather, and time outdoors.

Current level
Very High
Allergy index
5
Main allergen
Birch
Tomorrow
Low

Tomorrow eases to low with an index of 2.

Pollen Level

Very High Risk
5

Pollen Index

Primary Allergen

Birch

Stay indoors when possible. Use HEPA filters and take prescribed medication.

80°

Temp

46%

Humidity

16

Wind mph

Weather-allergy synergy

Why conditions feel this way today

Today in Sioux City, 16 mph wind can actively disperse birch pollen. Keeping windows closed is a practical move during peak outdoor hours.

Temp
80°F
Humidity
46%
Wind
16 mph
Rain chance
39%

24-hour allergy risk curve

Best outdoor window today in Sioux City

Planning estimate
12 AM: Very High3 AM: Very High6 AM: Very High8 AM: Very High10 AM: Very High12 PM: Very High3 PM: Very High6 PM: Very High9 PM: Very High11 PM: Very High

Better

Later evening or the calmest part of the day.

Avoid

Dry, breezy morning and midday periods.

Extra caution

Parks, fields, tree-lined streets, yard work, and long outdoor commutes.

Data confidence

Pollen source: fallback pollen estimate

Weather source: estimated weather

Pollen updated: June 28, 2026 at 3:40 PM ET

Weather updated: June 28, 2026 at 3:40 PM ET

Pollen can vary by neighborhood, vegetation, wind, recent rainfall, and time outdoors.

Check pollen in another city or ZIP code

5-Day Pollen Forecast

Best day this week

Tomorrow - Low

Worst day this week

Wed - Very High

Today
80°/60°
4
High
Tree5
Grass0
Weed0
Tomorrow
84°/52°
2
Low
Tree4
Grass0
Weed0
Tue
87°/54°
5
Very High
Tree4
Grass0
Weed0
Wed
88°/62°
5
Very High
Tree3
Grass0
Weed0
Thu
70°/62°
3
Moderate
Tree4
Grass0
Weed0
None
Very Low
Low
Moderate
High
Very High

Allergen Breakdown

Birch
Very High
Oak
High
Maple
Moderate
Cedar
None

City allergy guide

Sioux City allergy profile

Today's risk+

Sioux City 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 Sioux City. Conditions can still vary by neighborhood, nearby plants, and time spent outdoors.

Today in Sioux City, 16 mph wind can actively disperse birch pollen. Keeping windows closed is a practical move during peak outdoor hours.

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 Sioux City 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.

Sioux City seasonal pollen calendar

Tree pollen

In season now

Spring

Often drives early-season symptoms

Grass pollen

In season now

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

Common pollen triggers around Sioux City

TriggerTypical seasonWhat to know
Tree pollenSpringOften drives early-season symptoms
Grass pollenLate spring to summerCan rise around lawns, parks, and open areas
Ragweed/weed pollenLate summer to fallMajor fall allergy trigger
Mold sporesVariesOften affected by moisture and decaying leaves

Sioux City pollen forecast in western Iowa

Sioux City allergy conditions are influenced by Plains wind, western Iowa vegetation, and seasonal pollen cycles that can intensify during dry and breezy stretches. Searchers looking for a Sioux City pollen forecast often want city-specific insight during active spring and summer periods.

Tree pollen, grasses, and weeds can all affect Sioux City residents depending on the season. Daily local forecasting helps users stay ahead of shifting allergen exposure.

Frequently asked questions about pollen in Sioux City

What is the pollen count in Sioux City today?

Today in Sioux City, Iowa, the pollen level is very high with an allergy index of 5. The main allergen to watch is Birch.

When is allergy season in Sioux City, Iowa?

Allergy season in Sioux City, Iowa 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 Sioux City?

If you have seasonal allergies in Sioux City, 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 Sioux City, Iowa?

Sioux City 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.