Union County, SD Weather Forecast & Current Conditions

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Union County, SD Weather Maps

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Union County Weather Map
UTC Time: 10/20/2026, 10:21
Your Time:
Aeronautical Observation: Automated synoptic observations via NWS Gateway.
Auto-refresh in: 5:02

Union County, SD Regional Weather

Expires:202610201100;;879653
ASUS43 KFSD 201010
RWRFSD

WEATHER ROUNDUP FOR SE SOUTH DAKOTA/SW MINNESOTA/NW IOWA
NATIONAL WEATHER SERVICE SIOUX FALLS SD
500 AM CDT TUE OCT 20 2026

NOTE: "FAIR" INDICATES FEW OR NO CLOUDS BELOW 12,000 FEET WITH NO
SIGNIFICANT WEATHER AND OR OBSTRUCTIONS TO VISIBILITY.



IAZ001>003-012>014-020>022-031-032-NEZ013-014-SDZ071-201100-
NORTHWEST IOWA
  
CITY           SKY/WX    TMP DP  RH WIND       PRES   REMARKS
DENISON        PTCLDY    39  39 100 NE5       30.29S TC   4           
ESTHERVILLE    CLEAR     37  37 100 S5        30.29S FOG     TC   3   
LE MARS        CLEAR    N/A N/A N/A CALM      30.25R                  
MAURICE        PTCLDY    45  43  93 SE8       30.25S TC   7           
SHELDON        CLEAR     43  43 100 E5        30.25S TC   6           
SIOUX CITY     CLEAR     44  39  82 E7        30.26S TC   7           
SPENCER        CLEAR     39  37  92 E5        30.29S TC   4           
STORM LAKE     CLEAR     41  37  87 SE6       30.29R TC   5           
$$
 
ABBREVIATIONS USED IN REMARKS
   TC - TEMPERATURE IN CELSIUS
  WCI - WIND CHILL INDEX
   HX - HEAT INDEX
  VSB - VISIBILITY

  

SKY/WX - Weather  TMP - Temperature  DP - Dew Point  RH - Humidity
WIND - Wind Direction/Speed PRES - Barometric Pressure VSB - Visibility
WCI - Wind Chill Index E13G22 Wind - East Wind 13 mph/Gusts of 22 mph

Union County, SD

Today
Sunny
72°/ 48° 22°/ 9°
0%
Wednesday
Sunny
75°/ 50° 24°/ 10°
0%
Thursday
Sunny
75°/ 55° 24°/ 13°
0%
Friday
Sunny
75°/ 58° 24°/ 14°
0%
Saturday
Rain Showers
68°/ 48° 20°/ 9°
70%
Sunday
Rain Showers
62°/ 45° 17°/ 7°
30%
Monday
Sunny
60°16°
0%

Day: Sunny. Highs in the lower 70s. Southeast winds 10 to 15 mph.

Night: Mostly clear in the evening, then becoming partly cloudy. Lows in the upper 40s. South winds 5 to 10 mph.

Le Mars, IA

Today
Sunny
70°/ 48° 21°/ 9°
0%
Wednesday
Sunny
72°/ 50° 22°/ 10°
0%
Thursday
Sunny
75°/ 58° 24°/ 14°
0%
Friday
Sunny
72°/ 58° 22°/ 14°
0%
Saturday
Rain Showers
68°/ 48° 20°/ 9°
70%
Sunday
Rain Showers
62°/ 45° 17°/ 7°
30%
Monday
Sunny
60°16°
0%

Day: Sunny. Highs around 70. South winds 5 to 10 mph.

Night: Mostly clear in the evening, then becoming partly cloudy. Lows in the upper 40s. South winds 5 to 10 mph.

Vermillion, SD

Today
Sunny
72°/ 48° 22°/ 9°
0%
Wednesday
Sunny
75°/ 50° 24°/ 10°
0%
Thursday
Sunny
75°/ 58° 24°/ 14°
20%
Friday
Sunny
75°/ 58° 24°/ 14°
40%
Saturday
Rain Showers
68°/ 48° 20°/ 9°
70%
Sunday
Rain Showers
62°/ 45° 17°/ 7°
30%
Monday
Sunny
60°16°
0%

Day: Sunny. Highs in the lower 70s. Southeast winds 10 to 15 mph with gusts up to 25 mph.

Night: Mostly clear in the evening, then becoming partly cloudy. Lows in the upper 40s. Southeast winds 5 to 10 mph.

Sioux Center, IA

Today
Sunny
70°/ 48° 21°/ 9°
0%
Wednesday
Sunny
72°/ 50° 22°/ 10°
0%
Thursday
Sunny
75°/ 55° 24°/ 13°
0%
Friday
Partly Cloudy
72°/ 58° 22°/ 14°
0%
Saturday
Rain Showers
68°/ 48° 20°/ 9°
70%
Sunday
Rain Showers
62°/ 45° 17°/ 7°
30%
Monday
Sunny
58°14°
0%

Day: Sunny. Highs around 70. South winds 10 to 15 mph.

Night: Mostly clear in the evening, then becoming partly cloudy. Lows in the upper 40s. South winds 5 to 10 mph.

Wakefield, NE

Today
Sunny
70°/ 48° 21°/ 9°
0%
Wednesday
Sunny
75°/ 50° 24°/ 10°
0%
Thursday
Sunny
75°/ 55° 24°/ 13°
0%
Friday
Sunny
75°/ 58° 24°/ 14°
0%
Saturday
Rain Showers
68°/ 48° 20°/ 9°
70%
Sunday
Rain Showers
62°/ 45° 17°/ 7°
30%
Monday
Partly Cloudy
60°16°
0%

Day: Sunny. Highs around 70. South winds 10 to 15 mph with gusts up to 25 mph.

Night: Mostly clear in the evening, then becoming partly cloudy. Lows in the upper 40s. South winds 5 to 10 mph with gusts up to 20 mph.

Hartington, NE

Tonight
Clear
48°9°
0%
Tuesday
Sunny
68°/ 50° 20°/ 10°
0%
Wednesday
Sunny
72°/ 52° 22°/ 11°
0%
Thursday
Sunny
75°/ 58° 24°/ 14°
20%
Friday
Sunny
75°/ 58° 24°/ 14°
40%
Saturday
Thunderstorms
68°/ 48° 20°/ 9°
70%
Sunday
Rain Showers
62°/ 45° 17°/ 7°
40%
Monday
Sunny
58°14°
0%

Night: Clear. Near steady temperature in the upper 40s. South winds 5 to 10 mph with gusts up to 20 mph.

Sioux City, IA

Today
Sunny
70°/ 48° 21°/ 9°
0%
Wednesday
Sunny
72°/ 50° 22°/ 10°
0%
Thursday
Sunny
75°/ 55° 24°/ 13°
0%
Friday
Sunny
75°/ 58° 24°/ 14°
0%
Saturday
Rain Showers
70°/ 48° 21°/ 9°
50%
Sunday
Rain Showers
65°/ 45° 18°/ 7°
30%
Monday
Sunny
60°16°
0%

Day: Sunny. Highs around 70. Southeast winds 5 to 10 mph.

Night: Mostly clear in the evening, then becoming partly cloudy. Lows in the upper 40s. South winds 5 to 10 mph.

South Sioux City, NE

Today
Sunny
72°/ 48° 22°/ 9°
0%
Wednesday
Sunny
75°/ 48° 24°/ 9°
0%
Thursday
Sunny
75°/ 55° 24°/ 13°
0%
Friday
Sunny
75°/ 58° 24°/ 14°
0%
Saturday
Rain Showers
70°/ 48° 21°/ 9°
50%
Sunday
Rain Showers
65°/ 45° 18°/ 7°
30%
Monday
Sunny
62°17°
0%

Day: Sunny. Highs in the lower 70s. Southeast winds 10 to 15 mph.

Night: Mostly clear. Lows in the upper 40s. South winds 5 to 10 mph.

Canton, SD

Today
Sunny
70°/ 48° 21°/ 9°
0%
Wednesday
Sunny
72°/ 50° 22°/ 10°
0%
Thursday
Sunny
75°/ 55° 24°/ 13°
0%
Friday
Partly Cloudy
72°/ 58° 22°/ 14°
40%
Saturday
Rain Showers
68°/ 48° 20°/ 9°
70%
Sunday
Rain Showers
62°/ 45° 17°/ 7°
40%
Monday
Sunny
58°14°
0%

Day: Sunny. Highs around 70. Southeast winds 10 to 15 mph with gusts up to 25 mph.

Night: Mostly clear in the evening, then becoming partly cloudy. Lows in the upper 40s. South winds 5 to 10 mph.

Yankton, SD

Today
Sunny
70°/ 48° 21°/ 9°
0%
Wednesday
Sunny
72°/ 52° 22°/ 11°
0%
Thursday
Sunny
75°/ 58° 24°/ 14°
30%
Friday
Sunny
72°/ 58° 22°/ 14°
40%
Saturday
Rain Showers
65°/ 45° 18°/ 7°
70%
Sunday
Rain Showers
62°/ 45° 17°/ 7°
40%
Monday
Sunny
58°14°
0%

Day: Sunny. Highs around 70. Southeast winds 10 to 15 mph with gusts up to 25 mph.

Night: Mostly clear. Lows in the upper 40s. Southeast winds 5 to 10 mph.

Parker, SD

Today
Sunny
70°/ 48° 21°/ 9°
0%
Wednesday
Sunny
72°/ 50° 22°/ 10°
0%
Thursday
Sunny
75°/ 58° 24°/ 14°
20%
Friday
Partly Cloudy
72°/ 58° 22°/ 14°
40%
Saturday
Rain Showers
68°/ 45° 20°/ 7°
70%
Sunday
Rain Showers
62°/ 42° 17°/ 6°
30%
Monday
Sunny
58°14°
0%

Day: Sunny. Highs around 70. Southeast winds 10 to 15 mph with gusts up to 25 mph.

Night: Mostly clear. Lows in the upper 40s. South winds 5 to 10 mph.

Rock Rapids, IA

Today
Sunny
70°/ 48° 21°/ 9°
0%
Wednesday
Sunny
72°/ 50° 22°/ 10°
0%
Thursday
Sunny
75°/ 55° 24°/ 13°
0%
Friday
Partly Cloudy
72°/ 58° 22°/ 14°
0%
Saturday
Rain Showers
68°/ 48° 20°/ 9°
60%
Sunday
Rain Showers
62°/ 45° 17°/ 7°
40%
Monday
Sunny
58°14°
0%

Day: Sunny. Highs around 70. South winds 10 to 15 mph.

Night: Mostly clear in the evening, then becoming partly cloudy. Lows in the upper 40s. South winds 5 to 10 mph.

Pender, NE

Tonight
Clear
42°6°
0%
Tuesday
Sunny
70°/ 48° 21°/ 9°
0%
Wednesday
Sunny
72°/ 48° 22°/ 9°
0%
Thursday
Sunny
75°/ 55° 24°/ 13°
0%
Friday
Sunny
75°/ 58° 24°/ 14°
20%
Saturday
Rain Showers
70°/ 48° 21°/ 9°
50%
Sunday
Rain Showers
62°/ 45° 17°/ 7°
30%
Monday
Partly Cloudy
60°16°
0%

Night: Clear. Lows in the lower 40s. Southeast winds around 5 mph.

Cherokee, IA

Today
Sunny
70°/ 48° 21°/ 9°
0%
Wednesday
Sunny
72°/ 50° 22°/ 10°
0%
Thursday
Sunny
75°/ 55° 24°/ 13°
0%
Friday
Sunny
72°/ 58° 22°/ 14°
0%
Saturday
Rain Showers
70°/ 50° 21°/ 10°
50%
Sunday
Sunny
62°/ 45° 17°/ 7°
0%
Monday
Sunny
58°14°
0%

Day: Sunny. Highs around 70. South winds 5 to 10 mph.

Night: Mostly clear in the evening, then becoming partly cloudy. Lows in the upper 40s. South winds 5 to 10 mph.

Wayne, NE

Tonight
Clear
42°6°
0%
Tuesday
Sunny
70°/ 48° 21°/ 9°
0%
Wednesday
Sunny
72°/ 50° 22°/ 10°
0%
Thursday
Sunny
75°/ 55° 24°/ 13°
0%
Friday
Sunny
75°/ 58° 24°/ 14°
20%
Saturday
Rain Showers
68°/ 48° 20°/ 9°
60%
Sunday
Rain Showers
62°/ 45° 17°/ 7°
40%
Monday
Partly Cloudy
60°16°
0%

Night: Clear. Lows in the lower 40s. South winds 5 to 10 mph.

Creighton, NE

Tonight
Clear
45°7°
0%
Tuesday
Sunny
68°/ 50° 20°/ 10°
0%
Wednesday
Sunny
72°/ 52° 22°/ 11°
0%
Thursday
Sunny
75°/ 58° 24°/ 14°
20%
Friday
Sunny
75°/ 58° 24°/ 14°
40%
Saturday
Thunderstorms
65°/ 45° 18°/ 7°
60%
Sunday
Rain Showers
60°/ 45° 16°/ 7°
40%
Monday
Sunny
58°14°
0%

Night: Clear. Lows in the mid 40s. South winds around 10 mph with gusts up to 20 mph.

Sheldon, IA

Today
Sunny
68°/ 48° 20°/ 9°
0%
Wednesday
Sunny
72°/ 48° 22°/ 9°
0%
Thursday
Sunny
75°/ 55° 24°/ 13°
0%
Friday
Partly Cloudy
72°/ 58° 22°/ 14°
0%
Saturday
Rain Showers
68°/ 48° 20°/ 9°
50%
Sunday
Rain Showers
62°/ 45° 17°/ 7°
30%
Monday
Sunny
58°14°
0%

Day: Sunny. Highs in the upper 60s. South winds 10 to 15 mph.

Night: Mostly clear in the evening, then becoming partly cloudy. Lows in the upper 40s. South winds 5 to 10 mph.

Pierce, NE

Tonight
Clear
45°7°
0%
Tuesday
Sunny
68°/ 48° 20°/ 9°
0%
Wednesday
Sunny
72°/ 50° 22°/ 10°
0%
Thursday
Sunny
75°/ 58° 24°/ 14°
0%
Friday
Sunny
75°/ 58° 24°/ 14°
20%
Saturday
Thunderstorms
65°/ 45° 18°/ 7°
60%
Sunday
Rain Showers
62°/ 45° 17°/ 7°
40%
Monday
Sunny
58°14°
0%

Night: Clear. Lows in the mid 40s. South winds 5 to 10 mph.

Sioux Falls, SD

Today
Sunny
68°/ 48° 20°/ 9°
0%
Wednesday
Sunny
72°/ 50° 22°/ 10°
0%
Thursday
Sunny
75°/ 55° 24°/ 13°
0%
Friday
Partly Cloudy
72°/ 58° 22°/ 14°
0%
Saturday
Rain Showers
68°/ 45° 20°/ 7°
60%
Sunday
Rain Showers
62°/ 42° 17°/ 6°
40%
Monday
Sunny
58°14°
0%

Day: Sunny. Highs in the upper 60s. South winds 10 to 15 mph with gusts up to 25 mph.

Night: Mostly clear. Lows in the upper 40s. South winds 5 to 10 mph.

Onawa, IA

Tonight
Clear
42°6°
0%
Tuesday
Sunny
70°/ 48° 21°/ 9°
0%
Wednesday
Sunny
72°/ 48° 22°/ 9°
0%
Thursday
Sunny
75°/ 55° 24°/ 13°
0%
Friday
Sunny
75°/ 58° 24°/ 14°
0%
Saturday
Rain Showers
72°/ 50° 22°/ 10°
50%
Sunday
Rain Showers
65°/ 45° 18°/ 7°
20%
Monday
Sunny
62°17°
0%

Night: Clear. Lows in the lower 40s. Southeast winds around 5 mph.

Names listed above may include county names.

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