Dewey County, South Dakota, United States

Last updated: 3:50 PM CDT · Refresh

21°C

Feels like 14°

Partly Cloudy

▲ 21° / ▼ 11°

Wind

17 mph SE

Humidity

39%

Dew Point

6°

Pressure

27,91 inHg

Visibility

10 mi

UV Index

7,0

Cloud Cover

38%

Sunrise

6:18 AM

Sunset

6:57 PM

Drag to pan · double-click to forecast a point

WeatherAI™ Analysis

WeatherAI Analysis: Dewey County is currently partly cloudy at 21°C. Precipitation is likely — peak probability 90% around 4 AM. Sunrise: 6:18AM · Sunset: 6:57PM.

31 AQI · Good Dominant: O3 Air Quality

Hourly Forecast · Next 24 Hours

Now

21°

3 PM

20°

4 PM

21°

5 PM

20°

6 PM

19°

21%

7 PM

18°

28%

8 PM

16°

31%

9 PM

16°

35%

10 PM

15°

44%

11 PM

14°

54%

12 AM

14°

80%

1 AM

13°

85%

2 AM

13°

85%

3 AM

13°

85%

4 AM

11°

90%

5 AM

11°

81%

6 AM

12°

81%

7 AM

12°

70%

8 AM

13°

66%

9 AM

16°

66%

10 AM

16°

52%

11 AM

17°

28%

12 PM

18°

25%

1 PM

19°

20%

7-Day Forecast

Today

21° 11°

Partly Cloudy with a 54% chance of rain.

Mon

23° 11°

Partly Cloudy with a 85% chance of rain.

Tue

22° 7°

Clear.

Wed

20° 7°

Overcast with a 66% chance of rain.

Thu

27° 10°

Clear with a 60% chance of rain.

Fri

23° 14°

Drizzle, 60% chance.

Sat

22° 12°

Clear with a 35% chance of rain.

+ Feels like

TimeTempConditionsPrecipWindHumidity

Now 21° Partly Cloudy 3% 17 mph SE 39%

3 PM 20° Partly Cloudy 5% 16 mph SE 37%

4 PM 21° Partly Cloudy 5% 16 mph SE 39%

5 PM 20° Partly Cloudy 5% 16 mph SE 41%

6 PM 19° Mostly Clear 21% 15 mph SE 43%

7 PM 18° Partly Cloudy 28% 16 mph SE 46%

8 PM 16° Mostly Cloudy 31% 17 mph SE 49%

9 PM 16° Mostly Cloudy 35% 17 mph SE 52%

10 PM 15° Overcast 44% 18 mph SE 60%

11 PM 14° Overcast 54% 19 mph SSE 66%

12 AM 14° Overcast 80% 20 mph SSE 73%

1 AM 13° Heavy Rain 85% 24 mph SSE 77%

2 AM 13° Overcast 85% 21 mph SSE 81%

3 AM 13° Overcast 85% 21 mph SSE 84%

4 AM 11° Rain 90% 20 mph SSE 86%

5 AM 11° Rain 81% 20 mph SSE 87%

6 AM 12° Rain 81% 21 mph SSE 88%

7 AM 12° Mostly Cloudy 70% 21 mph SSE 88%

8 AM 13° Mostly Cloudy 66% 22 mph SSE 88%

9 AM 16° Mostly Cloudy 66% 18 mph S 84%

10 AM 16° Mostly Cloudy 52% 15 mph S 80%

11 AM 17° Mostly Cloudy 28% 18 mph SSW 75%

12 PM 18° Mostly Cloudy 25% 19 mph SW 68%

1 PM 19° Mostly Cloudy 20% 20 mph SW 60%

15-Day Forecast

Today

9/13

Partly Cloudy

54%

11°

21°

Mon

9/14

Partly Cloudy

85%

11°

23°

Tue

9/15

Clear

7°

22°

Wed

9/16

Overcast

66%

7°

20°

Thu

9/17

Clear

60%

10°

27°

Fri

9/18

Drizzle

60%

14°

23°

Sat

9/19

Clear

35%

12°

22°

Sun

9/20

Clear

25%

10°

22°

Mon

9/21

Drizzle

60%

11°

22°

Tue

9/22

Clear

60%

9°

24°

Wed

9/23

Drizzle

60%

12°

26°

Thu

9/24

Clear

25%

15°

26°

Fri

9/25

Clear

25%

14°

24°

Sat

9/26

Drizzle

60%

13°

23°

Sun

9/27

Clear

25%

13°

21°

Good

U.S. Air Quality Index · Dominant: O3

50 100 150 200

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

Pollutant Breakdown · Today

PM_2.5

Fine particulate matter

8 AQI 1.5 µg/m³

O₃

Ground-level ozone

Dominant

31 AQI 33 ppb

3-Day Outlook

DayAQICategoryO₃PM2.5

Mon 31 Good 31 8

Tue 35 Good 35 12

Wed 31 Good 31 15

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 dim. sept. 13, 19:00'Z' · F0 · 130 (13 km CONUS/NA)

Hodograph · kt

0–1 1–3 3–6 6–9 km

Instability

SBCAPE60 J/kg

MLCAPE9 J/kg

MUCAPE0 J/kg

SBCIN-0 J/kg

MLCIN-3 J/kg

Lifted Index7.8

Kinematics

0–6 km Shear72 kt

0–1 km Shear4 kt

Eff. Shear—

0–1 km SRH27

0–3 km SRH246

Eff. SRH—

Storm Motion319° @ 22 kt

0–1 km EHI0.0

Composite Parameters

Sig. Tornado0.0

STP (eff)—

Supercell—

K-Index18.2

Thermo & Levels

PWAT0.92 in

0–3 km LR5.8 °C/km

700–500 LR5.8 °C/km

Total Totals35.7

LCL761 hPa

LFC945 hPa

EL795 hPa

Freezing Lvl11,936 ft

Dewey County, South Dakota, United States

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