Excessive Heat Warning — Corson, SD, Campbell, SD, Walworth, SD, Dewey, SD, Potter, SD, McPherson, SD, Brown, SD, Marshall, SD, Roberts, SD, Edmunds, SD, Day, SD, Faulk, SD, Spink, SD, Grant, SD, Stanley, SD, Sully, SD, Hughes, SD, Hyde, SD, Hand, SD, Jones, SD, Lyman, SD, Buffalo, SD 10:00 PM Heat Advisory — McPherson, SD, Brown, SD, Marshall, SD, Roberts, SD, Edmunds, SD, Day, SD, Faulk, SD, Spink, SD, Grant, SD, Corson, SD, Campbell, SD, Walworth, SD, Dewey, SD, Potter, SD, Stanley, SD, Sully, SD, Hughes, SD, Hyde, SD, Hand, SD, Jones, SD, Lyman, SD, Buffalo, SD 10:00 PM

Dewey County, South Dakota, United States

Last updated: 5:05 PM CDT  ·  Refresh
35°C
Feels like 33°
Clear
▲ 36°  /  ▼ 21°
Wind
15 mph SSE
Humidity
23%
Dew Point
12°
Pressure
27.83 inHg
Visibility
10 mi
UV Index
7.7
Cloud Cover
0%
Sunrise
5:10 AM
Sunset
8:27 PM
Drag to pan · double-click to forecast a point
WeatherAI™ Analysis

WeatherAI Analysis: Dewey County is currently clear at 35°C. Dry conditions are expected through the next 24 hours. Sunrise: 5:10AM · Sunset: 8:27PM.

Alerts

Excessive Heat Warning
Corson, SD, Campbell, SD, Walworth, SD, Dewey, SD, Potter, SD, McPherson, SD, Brown, SD, Marshall, SD, Roberts, SD, Edmunds, SD, Day, SD, Faulk, SD, Spink, SD, Grant, SD, Stanley, SD, Sully, SD, Hughes, SD, Hyde, SD, Hand, SD, Jones, SD, Lyman, SD, Buffalo, SD
Expires 10:00 PM
Heat Advisory
McPherson, SD, Brown, SD, Marshall, SD, Roberts, SD, Edmunds, SD, Day, SD, Faulk, SD, Spink, SD, Grant, SD, Corson, SD, Campbell, SD, Walworth, SD, Dewey, SD, Potter, SD, Stanley, SD, Sully, SD, Hughes, SD, Hyde, SD, Hand, SD, Jones, SD, Lyman, SD, Buffalo, SD
Expires 10:00 PM
48 AQI · Good Dominant: O3 Air Quality
Hourly Forecast · Next 24 Hours
Now
35°
3%
5 PM
36°
8%
6 PM
36°
8%
7 PM
34°
8%
8 PM
32°
8%
9 PM
28°
8%
10 PM
27°
3%
11 PM
26°
3%
12 AM
25°
3%
1 AM
24°
3%
2 AM
23°
3%
3 AM
22°
3%
4 AM
22°
3%
5 AM
21°
3%
6 AM
21°
3%
7 AM
23°
3%
8 AM
24°
3%
9 AM
26°
3%
10 AM
28°
3%
11 AM
31°
3%
12 PM
32°
3%
1 PM
34°
3%
2 PM
34°
3%
3 PM
37°
6%
7-Day Forecast
Today
36° 21°
Clear.
Thu
38° 21°
Mostly Clear.
Fri
37° 21°
Mostly Clear.
Sat
34° 20°
Partly Cloudy.
Sun
39° 20°
Partly Cloudy.
Mon
36° 21°
Drizzle, 50% chance.
Tue
31° 19°
Mostly Clear.
TimeTempConditionsPrecipWindHumidity
Now 35° Clear 3% 15 mph SSE 23%
5 PM 36° Clear 8% 14 mph SSE 23%
6 PM 36° Clear 8% 14 mph SSE 24%
7 PM 34° Clear 8% 13 mph SE 27%
8 PM 32° Clear 8% 12 mph SE 32%
9 PM 28° Clear 8% 12 mph SE 36%
10 PM 27° Clear 3% 13 mph SE 40%
11 PM 26° Clear 3% 14 mph SE 43%
12 AM 25° Clear 3% 15 mph SE 46%
1 AM 24° Clear 3% 14 mph SSE 49%
2 AM 23° Clear 3% 13 mph SSE 52%
3 AM 22° Clear 3% 12 mph SSE 55%
4 AM 22° Clear 3% 11 mph SSE 57%
5 AM 21° Clear 3% 10 mph SSE 58%
6 AM 21° Mostly Clear 3% 11 mph SSE 59%
7 AM 23° Mostly Clear 3% 12 mph S 55%
8 AM 24° Mostly Clear 3% 12 mph S 50%
9 AM 26° Mostly Clear 3% 12 mph S 45%
10 AM 28° Mostly Clear 3% 12 mph S 39%
11 AM 31° Mostly Clear 3% 12 mph S 34%
12 PM 32° Mostly Clear 3% 13 mph S 29%
1 PM 34° Mostly Clear 3% 12 mph S 28%
2 PM 34° Clear 3% 12 mph S 27%
3 PM 37° Clear 6% 11 mph S 26%
15-Day Forecast
Today
7/15
Clear
8%
21°
36°
Thu
7/16
Mostly Clear
6%
21°
38°
Fri
7/17
Mostly Clear
14%
21°
37°
Sat
7/18
Partly Cloudy
17%
20°
34°
Sun
7/19
Partly Cloudy
19%
20°
39°
Mon
7/20
Drizzle
50%
21°
36°
Tue
7/21
Mostly Clear
19%
19°
31°
Wed
7/22
Overcast
60%
18°
31°
Thu
7/23
Drizzle
60%
18°
33°
Fri
7/24
Drizzle
60%
16°
34°
Sat
7/25
Drizzle
60%
14°
33°
Sun
7/26
Drizzle
60%
20°
34°
Mon
7/27
Drizzle
60%
21°
34°
Tue
7/28
Drizzle
60%
21°
35°
Wed
7/29
Drizzle
60%
22°
36°
48
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
PM2.5
Fine particulate matter
27 AQI 4.9 µg/m³
O3
Ground-level ozone
Dominant
48 AQI 53 ppb
3-Day Outlook
DayAQICategoryO₃PM2.5
Thu 48 Good 48 27
Fri 50 Good 50 28
Sat 44 Good 44 29
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 Wed Jul 15, 20:00'Z' · F0 · 130 (13 km CONUS/NA)
Hodograph · kt
10 20 30 40 SM
0–1 1–3 3–6 6–9 km
Instability
SBCAPE93 J/kg
MLCAPE17 J/kg
MUCAPE93 J/kg
SBCIN0 J/kg
MLCIN0 J/kg
Lifted Index3.5
Kinematics
0–6 km Shear21 kt
0–1 km Shear3 kt
Eff. Shear—
0–1 km SRH10
0–3 km SRH-19
Eff. SRH—
Storm Motion185° @ 25 kt
0–1 km EHI0.0
Composite Parameters
Sig. Tornado0.0
STP (eff)—
Supercell—
K-Index22.5
Thermo & Levels
PWAT0.82 in
0–3 km LR8.6 °C/km
700–500 LR4.8 °C/km
Total Totals37.9
LCL673 hPa
LFC943 hPa
EL715 hPa
Freezing Lvl16,017 ft