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

Walworth County, South Dakota, United States

Last updated: 5:49 PM CDT  ·  Refresh
33°C
Feels like 32°
Clear
▲ 35°  /  ▼ 19°
Wind
13 mph SSE
Humidity
26%
Dew Point
13°
Pressure
27.93 inHg
Visibility
10 mi
UV Index
6.7
Cloud Cover
1%
Sunrise
6:06 AM
Sunset
9:25 PM
Drag to pan · double-click to forecast a point
WeatherAI™ Analysis

WeatherAI Analysis: Walworth County is currently clear at 34°C. Dry conditions are expected through the next 24 hours. Sunrise: 6:06AM · Sunset: 9:25PM.

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
44 AQI · Good Dominant: O3 Air Quality
Hourly Forecast · Next 24 Hours
Now
33°
3%
6 PM
34°
3%
7 PM
33°
3%
8 PM
31°
3%
9 PM
27°
3%
10 PM
26°
3%
11 PM
24°
3%
12 AM
24°
3%
1 AM
23°
3%
2 AM
23°
3%
3 AM
22°
3%
4 AM
22°
3%
5 AM
19°
3%
6 AM
19°
3%
7 AM
22°
3%
8 AM
24°
3%
9 AM
26°
3%
10 AM
28°
3%
11 AM
29°
3%
12 PM
31°
3%
1 PM
33°
3%
2 PM
33°
5%
3 PM
34°
5%
4 PM
34°
6%
7-Day Forecast
Today
35° 19°
Clear.
Thu
37° 19°
Mostly Clear.
Fri
37° 21°
Partly Cloudy.
Sat
33° 18°
Partly Cloudy.
Sun
38° 19°
Partly Cloudy.
Mon
35° 19°
Clear.
Tue
31° 18°
Mostly Clear.
TimeTempConditionsPrecipWindHumidity
Now 33° Clear 3% 13 mph SSE 26%
6 PM 34° Clear 3% 11 mph SSE 27%
7 PM 33° Clear 3% 12 mph SE 32%
8 PM 31° Clear 3% 12 mph SE 38%
9 PM 27° Clear 3% 11 mph SE 44%
10 PM 26° Clear 3% 11 mph SE 47%
11 PM 24° Clear 3% 11 mph SE 50%
12 AM 24° Clear 3% 11 mph SE 52%
1 AM 23° Clear 3% 10 mph SE 57%
2 AM 23° Clear 3% 10 mph SE 60%
3 AM 22° Clear 3% 10 mph SE 64%
4 AM 22° Clear 3% 10 mph SSE 66%
5 AM 19° Clear 3% 9 mph SSE 67%
6 AM 19° Clear 3% 9 mph SSE 68%
7 AM 22° Clear 3% 9 mph SSE 62%
8 AM 24° Mostly Clear 3% 10 mph SSE 54%
9 AM 26° Mostly Clear 3% 10 mph S 47%
10 AM 28° Mostly Clear 3% 10 mph S 42%
11 AM 29° Mostly Clear 3% 10 mph S 37%
12 PM 31° Mostly Clear 3% 11 mph S 34%
1 PM 33° Mostly Clear 3% 10 mph S 32%
2 PM 33° Mostly Clear 5% 10 mph S 32%
3 PM 34° Mostly Clear 5% 9 mph S 31%
4 PM 34° Mostly Clear 6% 9 mph S 30%
15-Day Forecast
Today
7/15
Clear
3%
19°
35°
Thu
7/16
Mostly Clear
7%
19°
37°
Fri
7/17
Partly Cloudy
13%
21°
37°
Sat
7/18
Partly Cloudy
17%
18°
33°
Sun
7/19
Partly Cloudy
19%
19°
38°
Mon
7/20
Clear
9%
19°
35°
Tue
7/21
Mostly Clear
9%
18°
31°
Wed
7/22
Mostly Cloudy
60%
18°
30°
Thu
7/23
Drizzle
60%
17°
33°
Fri
7/24
Drizzle
60%
16°
33°
Sat
7/25
Drizzle
60%
12°
33°
Sun
7/26
Drizzle
60%
19°
33°
Mon
7/27
Drizzle
60%
19°
33°
Tue
7/28
Drizzle
60%
20°
34°
Wed
7/29
Drizzle
60%
21°
35°
44
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
30 AQI 5.5 µg/m³
O3
Ground-level ozone
Dominant
44 AQI 47 ppb
3-Day Outlook
DayAQICategoryO₃PM2.5
Thu 44 Good 44 30
Fri 49 Good 49 33
Sat 43 Good 43 28
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, 21:00'Z' · F0 · 130 (13 km CONUS/NA)
Hodograph · kt
10 20 30 40 SM
0–1 1–3 3–6 6–9 km
Instability
SBCAPE79 J/kg
MLCAPE12 J/kg
MUCAPE79 J/kg
SBCIN0 J/kg
MLCIN0 J/kg
Lifted Index3.5
Kinematics
0–6 km Shear22 kt
0–1 km Shear4 kt
Eff. Shear—
0–1 km SRH12
0–3 km SRH-19
Eff. SRH—
Storm Motion184° @ 24 kt
0–1 km EHI0.0
Composite Parameters
Sig. Tornado0.0
STP (eff)—
Supercell—
K-Index18.8
Thermo & Levels
PWAT0.85 in
0–3 km LR8.2 °C/km
700–500 LR4.7 °C/km
Total Totals37.8
LCL696 hPa
LFC946 hPa
EL729 hPa
Freezing Lvl15,925 ft