Extreme Heat Warning — Corson, SD, Campbell, SD, McPherson, SD, Walworth, SD, Edmunds, SD, Dewey, SD, Potter, SD, Faulk, SD, Stanley, SD, Sully, SD, Hughes, SD, Hyde, SD, Hand, SD, Jones, SD, Lyman, SD, Buffalo, SD 9:00 PM Heat Advisory — Brown, SD, Marshall, SD, Roberts, SD, Day, SD, Spink, SD, Clark, SD, Codington, SD, Grant, SD, Hamlin, SD, Deuel, SD, Corson, SD, Campbell, SD, McPherson, SD, Walworth, SD, Edmunds, SD, Dewey, SD, Potter, SD, Faulk, SD, Stanley, SD, Sully, SD, Hughes, SD, Hyde, SD, Hand, SD, Jones, SD, Lyman, SD, Buffalo, SD 9:00 PM

Dewey County, South Dakota, United States

Last updated: 7:44 AM CDT  ·  Refresh
24°C
Feels like 25°
Partly Cloudy
▲ 38°  /  ▼ 23°
Wind
7 mph S
Humidity
66%
Dew Point
19°
Pressure
27.67 inHg
Visibility
10 mi
UV Index
3.5
Cloud Cover
38%
Sunrise
5:21 AM
Sunset
8:17 PM
Drag to pan · double-click to forecast a point
WeatherAI™ Analysis

WeatherAI Analysis: Dewey County is currently partly cloudy at 25°C. Dry conditions are expected through the next 24 hours. Atmospheric instability is elevated (CAPE up to 1779 J/kg) — isolated convective development possible. Sunrise: 5:21AM · Sunset: 8:17PM.

Alerts

Extreme Heat Warning
Corson, SD, Campbell, SD, McPherson, SD, Walworth, SD, Edmunds, SD, Dewey, SD, Potter, SD, Faulk, SD, Stanley, SD, Sully, SD, Hughes, SD, Hyde, SD, Hand, SD, Jones, SD, Lyman, SD, Buffalo, SD
Expires 9:00 PM
Heat Advisory
Brown, SD, Marshall, SD, Roberts, SD, Day, SD, Spink, SD, Clark, SD, Codington, SD, Grant, SD, Hamlin, SD, Deuel, SD, Corson, SD, Campbell, SD, McPherson, SD, Walworth, SD, Edmunds, SD, Dewey, SD, Potter, SD, Faulk, SD, Stanley, SD, Sully, SD, Hughes, SD, Hyde, SD, Hand, SD, Jones, SD, Lyman, SD, Buffalo, SD
Expires 9:00 PM
46 AQI · Good Dominant: PM2.5 Air Quality
Hourly Forecast · Next 24 Hours
Now
24°
11%
7 AM
24°
29%
8 AM
26°
21%
9 AM
27°
21%
10 AM
29°
14%
11 AM
31°
14%
12 PM
34°
3%
1 PM
36°
3%
2 PM
37°
3%
3 PM
37°
3%
4 PM
38°
3%
5 PM
38°
3%
6 PM
37°
3%
7 PM
34°
3%
8 PM
31°
3%
9 PM
29°
3%
10 PM
28°
3%
11 PM
28°
3%
12 AM
28°
5%
1 AM
26°
5%
2 AM
25°
5%
3 AM
25°
5%
4 AM
24°
5%
5 AM
24°
9%
7-Day Forecast
Today
38° 23°
Clear with a 21% chance of rain.
Mon
37° 24°
Partly Cloudy with a 39% chance of rain.
Tue
37° 20°
Clear.
Wed
36° 19°
Clear with a 58% chance of rain.
Thu
32° 19°
Rain, 69% chance.
Fri
32° 17°
Rain, 29% chance.
Sat
32° 17°
Clear.
TimeTempConditionsPrecipWindHumidity
Now 24° Partly Cloudy 11% 7 mph S 66%
7 AM 24° Clear 29% 11 mph S 57%
8 AM 26° Clear 21% 9 mph SSW 53%
9 AM 27° Clear 21% 7 mph SW 48%
10 AM 29° Clear 14% 7 mph WNW 43%
11 AM 31° Clear 14% 7 mph NW 37%
12 PM 34° Clear 3% 8 mph N 31%
1 PM 36° Clear 3% 9 mph N 26%
2 PM 37° Clear 3% 9 mph N 23%
3 PM 37° Clear 3% 8 mph N 22%
4 PM 38° Clear 3% 8 mph N 21%
5 PM 38° Clear 3% 9 mph N 21%
6 PM 37° Clear 3% 6 mph N 22%
7 PM 34° Clear 3% 5 mph N 25%
8 PM 31° Clear 3% 6 mph N 28%
9 PM 29° Clear 3% 6 mph NNE 29%
10 PM 28° Clear 3% 6 mph NE 30%
11 PM 28° Clear 3% 6 mph NE 32%
12 AM 28° Clear 5% 6 mph NE 34%
1 AM 26° Clear 5% 5 mph NE 37%
2 AM 25° Mostly Clear 5% 5 mph NE 40%
3 AM 25° Mostly Clear 5% 5 mph NE 41%
4 AM 24° Mostly Clear 5% 5 mph NE 41%
5 AM 24° Partly Cloudy 9% 5 mph NE 41%
15-Day Forecast
Today
7/26
Clear
21%
23°
38°
Mon
7/27
Partly Cloudy
39%
24°
37°
Tue
7/28
Clear
18%
20°
37°
Wed
7/29
Clear
58%
19°
36°
Thu
7/30
Rain
69%
19°
32°
Fri
7/31
Rain
29%
17°
32°
Sat
8/1
Clear
17%
17°
32°
Sun
8/2
Clear
18%
20°
38°
Mon
8/3
Clear
19%
20°
36°
Tue
8/4
Clear
44%
16°
28°
Wed
8/5
Drizzle
60%
17°
29°
Thu
8/6
Drizzle
60%
19°
30°
Fri
8/7
Clear
25%
19°
32°
Sat
8/8
Drizzle
60%
21°
32°
Sun
8/9
Drizzle
60%
20°
31°
46
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
PM2.5
Fine particulate matter
Dominant
46 AQI 8.3 µg/m³
O3
Ground-level ozone
43 AQI 47 ppb
3-Day Outlook
DayAQICategoryO₃PM2.5
Mon 46 Good 43 46
Tue 53 Moderate 50 53
Wed 77 Moderate 77 56
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. PM2.5 (fine particles) is reported in µg/m³ and ozone (O3) in ppb. Forecast source: NWS NAQFC.

1000850700500400300250200150100 -40-30-20-10010203040 0.41247101624 LCLLFCEL0°C Temperature (°C) Pressure (hPa)
Temp Dewpoint Parcel (SB) CAPE CIN Dry adiabat Moist adiabat Mixing ratio
RAP
Valid Sun Jul 26, 11:00'Z' · F0 · 130 (13 km CONUS/NA)
Hodograph · kt
10 20 30 40 50 60 70 SM
0–1 1–3 3–6 6–9 km
Instability
SBCAPE379 J/kg
MLCAPE118 J/kg
MUCAPE379 J/kg
SBCIN-798 J/kg
MLCIN0 J/kg
Lifted Index-2.3
Kinematics
0–6 km Shear36 kt
0–1 km Shear4 kt
Eff. Shear33 kt
0–1 km SRH56
0–3 km SRH-17
Eff. SRH-73
Storm Motion232° @ 28 kt
0–1 km EHI0.1
Composite Parameters
Sig. Tornado0.1
STP (eff)0.0
Supercell0.0
K-Index31.6
Thermo & Levels
PWAT1.53 in
0–3 km LR4.3 °C/km
700–500 LR8.0 °C/km
Total Totals49.1
LCL859 hPa
LFC578 hPa
EL249 hPa
Freezing Lvl14,491 ft