South Dakota Pollen Count Today

Check today's pollen count by city in South Dakota. Explore local allergy forecasts, monitor common seasonal allergens, and use city-level trends to plan around high pollen days.

Allergy Ava organizes statewide and local pollen information so you can compare conditions, anticipate seasonal flare-ups, and find relevant allergy forecast pages faster.

Today's pollen count in South Dakota

Pollen levels in South Dakota can vary by city, weather, vegetation, and season. Choose a local forecast below to see the current allergy index, main allergen, and 5-day outlook for cities including Sioux Falls, Rapid City, Aberdeen, Brookings, Watertown, Mitchell.

Today's statewide signal

South Dakota pollen count by city: prairie wind, Black Hills air, grass, and ragweed

South Dakota allergy conditions can shift quickly between eastern prairie cities, James River and Missouri River corridors, open farmland, and the drier Black Hills foothills. Compare Sioux Falls, Rapid City, Aberdeen, Brookings, Watertown, Mitchell, Yankton, and Huron for local pollen levels, dominant allergens, weather context, and short-term trend signals.

Data updates regularly to reflect current conditions across South Dakota cities.

Highest city index now

Sioux Falls

Birch · Very High

Average pollen index: 4
Average humidity: 58%
Average wind: 10 mph

Live city comparison

Today's pollen and weather by city

Sort South Dakota cities by pollen index, temperature, or trend. Select a city for its full local forecast.

		Main allergen			Weather context
Sioux Falls	5Very High	Birch	Rising Forecast moves toward moderate conditions tomorrow.	79°F	Humid 13 mph wind can disperse birch pollen quickly today.
Watertown	5Very High	Birch	Rising Forecast moves toward high conditions tomorrow.	79°F	Chance of showers 14 mph wind can disperse birch pollen quickly today.
Mitchell	5Very High	Birch	Rising Forecast moves toward very high conditions tomorrow.	80°F	Chance of showers Watch birch levels and limit long outdoor exposure during peak hours.
Aberdeen	4High	Birch	Stable Tomorrow looks similar, near high conditions.	79°F	Partly sunny 14 mph wind can disperse birch pollen quickly today.
Brookings	4High	Birch	Rising Forecast moves toward moderate conditions tomorrow.	79°F	Partly sunny Watch birch levels and limit long outdoor exposure during peak hours.
Yankton	4High	Birch	Stable Tomorrow looks similar, near none conditions.	80°F	Partly sunny Watch birch levels and limit long outdoor exposure during peak hours.
Rapid City	3Moderate	Birch	Falling Forecast eases toward high conditions tomorrow.	80°F	Partly sunny Watch birch levels and limit long outdoor exposure during peak hours.
Huron	3Moderate	Maple	Rising Forecast moves toward very high conditions tomorrow.	80°F	Partly sunny Watch maple levels and limit long outdoor exposure during peak hours.

Sioux Falls

Birch is the main allergen

Very High

Pollen index

Trend

Rising

79°13 mph79%

13 mph wind can disperse birch pollen quickly today.

Watertown

Birch is the main allergen

Very High

Pollen index

Trend

Rising

79°14 mph58%

14 mph wind can disperse birch pollen quickly today.

Mitchell

Birch is the main allergen

Very High

Pollen index

Trend

Rising

80°11 mph50%

Watch birch levels and limit long outdoor exposure during peak hours.

Aberdeen

Birch is the main allergen

High

Pollen index

Trend

Stable

79°14 mph59%

14 mph wind can disperse birch pollen quickly today.

Brookings

Birch is the main allergen

High

Pollen index

Trend

Rising

79°10 mph46%

Watch birch levels and limit long outdoor exposure during peak hours.

Yankton

Birch is the main allergen

High

Pollen index

Trend

Stable

80°6 mph53%

Watch birch levels and limit long outdoor exposure during peak hours.

Rapid City

Birch is the main allergen

Moderate

Pollen index

Trend

Falling

80°5 mph61%

Watch birch levels and limit long outdoor exposure during peak hours.

Huron

Maple is the main allergen

Moderate

Pollen index

Trend

Rising

80°5 mph60%

Watch maple levels and limit long outdoor exposure during peak hours.

Regional allergy forecast

How South Dakota regions compare today

Sioux Falls, Brookings, and the I-29 prairie corridor

Eastern South Dakota combines prairie wind, lawns, shelterbelt trees, parks, campus landscapes, and field edges. Spring tree pollen can shift into grass quickly once warm, dry late-spring weather arrives.

MapleCottonwoodBluegrassRagweed

Index: 5
Humidity: 61%
Wind: 12

Aberdeen, Huron, Mitchell, and Yankton river-and-plains belt

These cities sit near river corridors, open agricultural land, road ditches, and wind-exposed prairie. Cottonwood and elm can matter in spring, while grass, ragweed, kochia, and Russian thistle become more important later.

CottonwoodElmGrassKochia

Index: 4
Humidity: 56%
Wind: 9

Rapid City and the Black Hills foothills

Rapid City has a different allergy rhythm from the eastern prairie, with Black Hills foothill vegetation, pine and juniper influence, drier air, grassland, sagebrush, dust, and gusty downslope wind.

JuniperPineGrassSagebrush

Index: 3
Humidity: 61%
Wind: 5

State-specific pollen calendar

When major allergens are active in South Dakota

Spring trees

April to May

AprMay

Maple, elm, ash, birch, cottonwood, willow, oak, and mulberry can drive spring symptoms. Southern and lower-elevation areas may start earlier than cooler northern or foothill locations.

Prairie grasses

Late May to July

MayJunJul

Bluegrass, timothy, rye, fescue, brome, lawns, parks, hay fields, road edges, and open grassland can raise exposure during warm, dry, breezy weather.

Ragweed and dryland weeds

Mid-August to hard freeze

AugSepOct

Ragweed is the main late-season trigger, with kochia, lamb’s quarters, Russian thistle, pigweed, sagebrush, and marsh elder adding pressure around fields, ditches, vacant lots, and disturbed soil.

Winter indoor season

November to March

NovDecJanFebMar

Outdoor pollen usually drops after repeated freezes and snow cover, but indoor dust, pets, dry heated air, basement mold, and wood smoke can still irritate symptoms.

Weather-pollen correlation

What weather means for today's allergy risk

Wind can disperse pollen, rain can temporarily wash particles down, and humidity can increase mold irritation. The city table combines pollen and weather signals so users can compare outdoor risk without opening every city page.

Loading city data

Preparing today's South Dakota pollen dashboard

About Pollen in South Dakota

South Dakota allergy sufferers can use this page to monitor pollen trends and find relevant city forecasts when available. Pollen levels vary by season, with tree pollen often peaking in spring, grass pollen becoming more active in late spring and summer, and weed pollen, especially ragweed, remaining a concern in late summer and fall.

Use Allergy Ava's city-level forecasts to plan outdoor activities, manage medication timing, and stay informed about the allergens most prevalent in your area. Our data is updated regularly to give you the most accurate picture of current conditions.

Frequently asked questions about South Dakota pollen forecasts

Why can Rapid City allergies differ from Sioux Falls or Brookings?

Rapid City is more Black Hills and foothill influenced, with drier air, pine, juniper, grassland, sagebrush, dust, and stronger terrain-driven wind. Sioux Falls and Brookings are more eastern prairie, lawn, field-edge, and shelterbelt influenced.

When do fall allergies usually start in South Dakota?

Weed season often becomes noticeable from late July into August and can last until a hard freeze. Ragweed is the biggest late-season driver, but kochia, Russian thistle, pigweed, lamb’s quarters, and sagebrush can also matter.

Why do South Dakota pollen days feel worse when it is windy?

Much of the state is open and wind-exposed, so pollen, grass fragments, dry weeds, dust, and plant debris can move long distances. A moderate count can feel more irritating when gusts keep particles airborne.

Are showy flowers the main cause of South Dakota hay fever?

Usually, no. Colorful or fragrant flowers are often insect-pollinated and do not spread as much airborne pollen. Wind-pollinated grasses, ragweed, oaks, mulberries, ash, and other trees are more likely to drive respiratory symptoms.