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

Lyman County, South Dakota, United States

Last updated: 5:03 PM CDT  ·  Refresh
35°C
Feels like 33°
Clear
▲ 36°  /  ▼ 19°
Wind
13 mph SSE
Humidity
25%
Dew Point
14°
Pressure
28.19 inHg
Visibility
10 mi
UV Index
7.6
Cloud Cover
1%
Sunrise
6:11 AM
Sunset
9:19 PM
Drag to pan · double-click to forecast a point
WeatherAI™ Analysis

WeatherAI Analysis: Lyman County is currently clear at 35°C. Dry conditions are expected through the next 24 hours. Sunrise: 6:11AM · Sunset: 9:19PM.

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
49 AQI · Good Dominant: O3 Air Quality
Hourly Forecast · Next 24 Hours
Now
35°
3%
6 PM
35°
8%
7 PM
34°
8%
8 PM
32°
8%
9 PM
30°
8%
10 PM
28°
8%
11 PM
27°
8%
12 AM
26°
3%
1 AM
26°
3%
2 AM
24°
3%
3 AM
23°
3%
4 AM
23°
3%
5 AM
22°
3%
6 AM
19°
3%
7 AM
19°
3%
8 AM
22°
3%
9 AM
24°
3%
10 AM
26°
3%
11 AM
27°
3%
12 PM
30°
3%
1 PM
31°
3%
2 PM
33°
3%
3 PM
33°
3%
4 PM
36°
3%
7-Day Forecast
Today
36° 19°
Clear.
Thu
37° 19°
Mostly Clear.
Fri
38° 21°
Mostly Clear.
Sat
35° 22°
Mostly Clear.
Sun
40° 22°
Mostly Cloudy.
Mon
37° 22°
Rain, 71% chance.
Tue
33° 21°
Clear with a 60% chance of rain.
TimeTempConditionsPrecipWindHumidity
Now 35° Clear 3% 13 mph SSE 25%
6 PM 35° Clear 8% 13 mph SSE 26%
7 PM 34° Clear 8% 14 mph SE 28%
8 PM 32° Clear 8% 14 mph SE 32%
9 PM 30° Clear 8% 13 mph SE 37%
10 PM 28° Clear 8% 13 mph SE 42%
11 PM 27° Clear 8% 12 mph SE 47%
12 AM 26° Clear 3% 12 mph SSE 51%
1 AM 26° Clear 3% 11 mph SSE 56%
2 AM 24° Clear 3% 10 mph SSE 59%
3 AM 23° Clear 3% 9 mph SSE 62%
4 AM 23° Clear 3% 9 mph SSE 66%
5 AM 22° Clear 3% 8 mph S 67%
6 AM 19° Clear 3% 7 mph SSE 69%
7 AM 19° Mostly Clear 3% 7 mph SSE 69%
8 AM 22° Mostly Clear 3% 8 mph S 60%
9 AM 24° Partly Cloudy 3% 8 mph S 52%
10 AM 26° Partly Cloudy 3% 9 mph S 44%
11 AM 27° Partly Cloudy 3% 9 mph S 40%
12 PM 30° Mostly Clear 3% 9 mph S 35%
1 PM 31° Mostly Clear 3% 9 mph S 33%
2 PM 33° Mostly Clear 3% 9 mph S 31%
3 PM 33° Mostly Clear 3% 9 mph S 29%
4 PM 36° Mostly Clear 3% 10 mph S 27%
15-Day Forecast
Today
7/15
Clear
8%
19°
36°
Thu
7/16
Mostly Clear
3%
19°
37°
Fri
7/17
Mostly Clear
15%
21°
38°
Sat
7/18
Mostly Clear
8%
22°
35°
Sun
7/19
Mostly Cloudy
19%
22°
40°
Mon
7/20
Rain
71%
22°
37°
Tue
7/21
Clear
60%
21°
33°
Wed
7/22
Drizzle
60%
19°
31°
Thu
7/23
Drizzle
60%
19°
34°
Fri
7/24
Drizzle
60%
17°
35°
Sat
7/25
Drizzle
60%
14°
34°
Sun
7/26
Drizzle
60%
21°
34°
Mon
7/27
Drizzle
60%
21°
34°
Tue
7/28
Drizzle
60%
22°
36°
Wed
7/29
Drizzle
60%
23°
37°
49
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
29 AQI 5.3 µg/m³
O3
Ground-level ozone
Dominant
49 AQI 54 ppb
3-Day Outlook
DayAQICategoryO₃PM2.5
Thu 49 Good 49 29
Fri 51 Moderate 51 28
Sat 46 Good 46 26
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
SBCAPE150 J/kg
MLCAPE25 J/kg
MUCAPE150 J/kg
SBCIN0 J/kg
MLCIN0 J/kg
Lifted Index3.5
Kinematics
0–6 km Shear20 kt
0–1 km Shear4 kt
Eff. Shear12 kt
0–1 km SRH-3
0–3 km SRH-38
Eff. SRH-38
Storm Motion173° @ 27 kt
0–1 km EHI-0.0
Composite Parameters
Sig. Tornado-0.0
STP (eff)0.0
Supercell0.0
K-Index21.3
Thermo & Levels
PWAT0.98 in
0–3 km LR8.2 °C/km
700–500 LR4.4 °C/km
Total Totals36.9
LCL702 hPa
LFC955 hPa
EL336 hPa
Freezing Lvl16,909 ft