Dewey County, South Dakota, United States

Last updated: 12:11 AM CDT · Refresh

23°C

Feels like 23°

Overcast

▲ 33° / ▼ 18°

Wind

11 mph ESE

Humidity

75%

Dew Point

19°

Pressure

27.62 inHg

Visibility

10 mi

UV Index

0.0

Cloud Cover

87%

Sunrise

6:00 AM

Sunset

7:25 PM

Drag to pan · double-click to forecast a point

WeatherAI™ Analysis

WeatherAI Analysis: Dewey County is currently overcast at 23°C. Precipitation is likely — peak probability 60% around 11 PM. Atmospheric instability is elevated (CAPE up to 1712 J/kg) — isolated convective development possible. Sunrise: 6:00AM · Sunset: 7:25PM.

46 AQI · Good Dominant: PM2.5 Air Quality

Hourly Forecast · Next 24 Hours

Now

23°

60%

12 AM

23°

41%

1 AM

22°

42%

2 AM

21°

39%

3 AM

21°

38%

4 AM

20°

39%

5 AM

18°

25%

6 AM

18°

23%

7 AM

18°

22%

8 AM

19°

27%

9 AM

20°

26%

10 AM

22°

26%

11 AM

23°

26%

12 PM

24°

31%

1 PM

26°

40%

2 PM

27°

21%

3 PM

28°

23%

4 PM

28°

29%

5 PM

29°

31%

6 PM

29°

35%

7 PM

27°

39%

8 PM

26°

39%

9 PM

22°

31%

10 PM

19°

35%

7-Day Forecast

Tonight

33° 18°

Overcast with a 60% chance of rain.

Sun

31° 18°

Mostly Cloudy with a 39% chance of rain.

Mon

32° 13°

Mostly Clear.

Tue

27° 17°

Rain, 70% chance.

Wed

34° 15°

Overcast.

Thu

34° 20°

Clear.

Fri

37° 18°

Rain.

+ Feels like

TimeTempConditionsPrecipWindHumidity

Now 23° Overcast 60% 11 mph ESE 75%

12 AM 23° Overcast 41% 12 mph ESE 75%

1 AM 22° Mostly Cloudy 42% 9 mph ESE 79%

2 AM 21° Mostly Cloudy 39% 8 mph E 83%

3 AM 21° Partly Cloudy 38% 8 mph ENE 86%

4 AM 20° Mostly Cloudy 39% 9 mph ENE 88%

5 AM 18° Mostly Cloudy 25% 9 mph ENE 90%

6 AM 18° Mostly Cloudy 23% 8 mph ENE 91%

7 AM 18° Mostly Cloudy 22% 8 mph ENE 88%

8 AM 19° Mostly Cloudy 27% 7 mph ENE 85%

9 AM 20° Mostly Cloudy 26% 6 mph NE 81%

10 AM 22° Mostly Cloudy 26% 5 mph NE 77%

11 AM 23° Overcast 26% 5 mph NE 73%

12 PM 24° Overcast 31% 4 mph NNE 69%

1 PM 26° Mostly Cloudy 40% 4 mph N 65%

2 PM 27° Partly Cloudy 21% 3 mph NNW 60%

3 PM 28° Partly Cloudy 23% 3 mph NNW 57%

4 PM 28° Partly Cloudy 29% 2 mph WNW 55%

5 PM 29° Partly Cloudy 31% 4 mph SSW 53%

6 PM 29° Mostly Clear 35% 4 mph SSW 54%

7 PM 27° Partly Cloudy 39% 5 mph NW 62%

8 PM 26° Partly Cloudy 39% 10 mph NNW 69%

9 PM 22° Mostly Cloudy 31% 14 mph NNW 74%

10 PM 19° Partly Cloudy 35% 13 mph NNW 75%

15-Day Forecast

Today

8/29

Overcast

60%

18°

33°

Sun

8/30

Mostly Cloudy

39%

18°

31°

Mon

8/31

Mostly Clear

13°

32°

Tue

9/1

Rain

70%

17°

27°

Wed

9/2

Overcast

10%

15°

34°

Thu

9/3

Clear

20°

34°

Fri

9/4

Rain

19%

18°

37°

Sat

9/5

Clear

19%

21°

34°

Sun

9/6

Drizzle

44%

18°

35°

Mon

9/7

Drizzle

44%

21°

33°

Tue

9/8

Clear

44%

18°

36°

Wed

9/9

Clear

60%

18°

36°

Thu

9/10

Drizzle

60%

16°

28°

Fri

9/11

Drizzle

60%

16°

27°

Sat

9/12

Drizzle

60%

15°

28°

Good

U.S. Air Quality Index · Dominant: PM2.5

50 100 150 200

Air quality is satisfactory and poses little or no health risk.

Pollutant Breakdown · Today

PM_2.5

Fine particulate matter

Dominant

46 AQI 8.3 µg/m³

O₃

Ground-level ozone

41 AQI 45 ppb

3-Day Outlook

DayAQICategoryO₃PM2.5

Today 46 Good 41 46

Mon 51 Moderate 39 51

Tue 55 Moderate 43 55

About the Air Quality Index

0–50 Good

51–100 Moderate

101–150 Unhealthy for Sensitive Groups

151–200 Unhealthy

201–300 Very Unhealthy

301–500 Hazardous

The U.S. AQI runs 0–500. The overall value equals the highest individual pollutant sub-index, and the dominant pollutant is the one driving it. PM_2.5 (fine particles) is reported in µg/m³ and ozone (O₃) in ppb. Forecast source: NWS NAQFC.

Temp Dewpoint Parcel (SB) CAPE CIN Dry adiabat Moist adiabat Mixing ratio

RAP

Valid Sun Aug 30, 03:00'Z' · F0 · 130 (13 km CONUS/NA)

Hodograph · kt

0–1 1–3 3–6 6–9 km

Instability

SBCAPE562 J/kg

MLCAPE1279 J/kg

MUCAPE1779 J/kg

SBCIN-142 J/kg

MLCIN-81 J/kg

Lifted Index-1.7

Kinematics

0–6 km Shear39 kt

0–1 km Shear14 kt

Eff. Shear40 kt

0–1 km SRH86

0–3 km SRH168

Eff. SRH168

Storm Motion292° @ 15 kt

0–1 km EHI0.3

Composite Parameters

Sig. Tornado0.2

STP (eff)0.8

Supercell6.2

K-Index39.1

Thermo & Levels

PWAT1.90 in

0–3 km LR6.2 °C/km

700–500 LR5.7 °C/km

Total Totals49.6

LCL875 hPa

LFC708 hPa

EL199 hPa

Freezing Lvl12,487 ft

Dewey County, South Dakota, United States

Alerts