Grass Lake, SD Weather Forecast & Current Conditions

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Grass Lake Weather Map
UTC Time: 10/17/2026, 22:59
Your Time:
Aeronautical Observation: Automated synoptic observations via NWS Gateway.
Auto-refresh in: 5:02

Grass Lake, SD Regional Weather

Expires:202610172300;;275646
ASUS43 KFSD 172210
RWRSD 

WEATHER ROUNDUP FOR SOUTH DAKOTA
NATIONAL WEATHER SERVICE SIOUX FALLS SD
500 PM CDT SAT OCT 17 2026

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



SDZ017-020-022-023-036>040-048>070-172300-
SOUTHEAST SOUTH DAKOTA
  
CITY           SKY/WX    TMP DP  RH WIND       PRES   REMARKS
SIOUX FALLS    SUNNY     62  33  33 S23G33    30.16F TC  17           
HURON          SUNNY     69  33  26 S18G32    30.03F TC  21           
CHAMBERLAIN    SUNNY     73  37  26 S15G21    30.05F TC  23           
MITCHELL       SUNNY     67  34  29 S18G30    30.09F TC  19           
YANKTON        SUNNY     64  32  30 S18G26    30.17F TC  18           
$$
 
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

Grass Lake, SD

Tonight
Cloudy
45°7°
0%
Sunday
Sunny
65°/ 42° 18°/ 6°
0%
Monday
Sunny
60°/ 45° 16°/ 7°
0%
Tuesday
Clear
68°20°
0%
Wednesday
Clear
68°20°
0%
Thursday
Clear
68°/ 55° 20°/ 13°
20%
Friday
Rain Showers
72°/ 58° 22°/ 14°
30%
Saturday
Rain Showers
68°20°
40%

Night: Clear this evening, then becoming partly cloudy. Windy and not as cool with lows in the mid 40s. South winds 20 to 30 mph, diminishing to 15 to 20 mph after midnight.

Clark, SD

Tonight
Cloudy
45°7°
0%
Sunday
Sunny
65°/ 42° 18°/ 6°
0%
Monday
Sunny
62°/ 45° 17°/ 7°
0%
Tuesday
Clear
68°20°
0%
Wednesday
Clear
68°20°
0%
Thursday
Clear
68°/ 55° 20°/ 13°
20%
Friday
Rain Showers
72°/ 58° 22°/ 14°
40%

Night: Clear this evening, then becoming partly cloudy. Breezy and not as cool with lows in the mid 40s. South winds 15 to 25 mph with gusts up to 35 mph.

Webster, SD

Tonight
Cloudy
45°7°
0%
Sunday
Sunny
65°/ 45° 18°/ 7°
0%
Monday
Sunny
60°/ 45° 16°/ 7°
0%
Tuesday
Clear
68°20°
0%
Wednesday
Clear
68°20°
0%
Thursday
Clear
68°/ 55° 20°/ 13°
20%
Friday
Rain Showers
72°/ 58° 22°/ 14°
40%

Night: Mostly clear this evening, then becoming partly cloudy. Breezy and not as cool with lows in the mid 40s. South winds 15 to 25 mph with gusts up to 35 mph.

Sisseton, SD

Tonight
Cloudy
48°9°
0%
Sunday
Sunny
68°/ 40° 20°/ 4°
0%
Monday
Sunny
60°/ 42° 16°/ 6°
0%
Tuesday
Clear
68°20°
0%
Wednesday
Clear
68°20°
0%
Thursday
Clear
68°/ 55° 20°/ 13°
20%
Friday
Rain Showers
75°/ 58° 24°/ 14°
40%

Night: Clear this evening, then becoming partly cloudy. Breezy and not as cool with lows in the upper 40s. Southwest winds 20 to 25 mph with gusts up to 40 mph.

Hayti, SD

Tonight
Clear
45°7°
0%
Sunday
Sunny
65°/ 42° 18°/ 6°
0%
Monday
Sunny
62°/ 45° 17°/ 7°
0%
Tuesday
Clear
68°20°
0%
Wednesday
Clear
68°20°
0%
Thursday
Clear
68°/ 55° 20°/ 13°
0%
Friday
Rain Showers
72°/ 58° 22°/ 14°
40%

Night: Mostly clear and breezy. Not as cool with lows in the mid 40s. South winds 15 to 25 mph with gusts up to 35 mph.

Milbank, SD

Tonight
Cloudy
48°9°
0%
Sunday
Partly Cloudy
68°/ 42° 20°/ 6°
0%
Monday
Sunny
60°/ 45° 16°/ 7°
0%
Tuesday
Clear
68°20°
0%
Wednesday
Clear
68°20°
0%
Thursday
Clear
68°/ 55° 20°/ 13°
20%
Friday
Rain Showers
72°/ 58° 22°/ 14°
30%
Saturday
Rain Showers
68°20°
40%

Night: Clear this evening, then becoming partly cloudy. Windy and not as cool with lows in the upper 40s. Southwest winds 20 to 30 mph with gusts up to 45 mph.

Clear Lake, SD

Tonight
Clear
45°7°
0%
Sunday
Partly Cloudy
65°/ 42° 18°/ 6°
0%
Monday
Sunny
60°/ 45° 16°/ 7°
0%
Tue-Tue Night
Clear
65°18°
0%
Wednesday
Clear
72°22°
0%
Thursday
Clear
72°/ 55° 22°/ 13°
0%
Fri-Fri Night
Rain Showers
72°22°
20%
Saturday
Rain Showers
68°20°
30%

Night: Mostly clear and very windy. Not as cool with lows in the mid 40s. Southwest winds 25 to 35 mph, diminishing to 20 to 25 mph after midnight.

Redfield, SD

Tonight
Cloudy
42°6°
0%
Sunday
Sunny
68°/ 42° 20°/ 6°
0%
Monday
Sunny
62°/ 42° 17°/ 6°
0%
Tuesday
Clear
68°20°
0%
Wednesday
Clear
68°20°
0%
Thursday
Clear
68°/ 55° 20°/ 13°
20%
Friday
Rain Showers
75°/ 55° 24°/ 13°
40%

Night: Mostly clear this evening, then becoming partly cloudy. Not as cool with lows in the lower 40s. South winds 15 to 20 mph with gusts up to 30 mph.

Aberdeen, SD

Tonight
Cloudy
42°6°
0%
Sunday
Sunny
68°/ 38° 20°/ 3°
0%
Monday
Sunny
62°/ 42° 17°/ 6°
0%
Tuesday
Clear
68°20°
0%
Wednesday
Clear
68°20°
0%
Thursday
Clear
68°/ 55° 20°/ 13°
20%
Friday
Thunderstorms
75°/ 55° 24°/ 13°
40%

Night: Mostly clear this evening, then becoming partly cloudy. Lows in the lower 40s. South winds 15 to 20 mph with gusts up to 30 mph.

Britton, SD

Tonight
Cloudy
45°7°
0%
Sunday
Partly Cloudy
65°/ 42° 18°/ 6°
0%
Monday
Sunny
58°/ 45° 14°/ 7°
0%
Tuesday
Clear
68°20°
0%
Wednesday
Clear
68°20°
0%
Thursday
Clear
68°/ 55° 20°/ 13°
20%
Friday
Rain Showers
72°/ 58° 22°/ 14°
40%

Night: Mostly clear this evening, then becoming partly cloudy. Breezy and not as cool with lows in the mid 40s. South winds 15 to 25 mph with gusts up to 40 mph.

De Smet, SD

Tonight
Clear
45°7°
0%
Sunday
Sunny
65°/ 42° 18°/ 6°
0%
Monday
Sunny
62°/ 45° 17°/ 7°
0%
Tuesday
Sunny
65°/ 48° 18°/ 9°
0%
Wednesday
Sunny
70°/ 48° 21°/ 9°
0%
Thursday
Sunny
72°/ 55° 22°/ 13°
0%
Friday
Mostly Cloudy
72°/ 58° 22°/ 14°
40%
Saturday
Rain Showers
68°20°
40%

Night: Mostly clear. Not as cool with lows in the mid 40s. South winds 15 to 20 mph with gusts up to 35 mph.

Wheaton, MN

Tonight
Cloudy
45°7°
0%
Sunday
Sunny
68°/ 40° 20°/ 4°
0%
Monday
Sunny
62°/ 42° 17°/ 6°
0%
Tuesday
Clear
68°20°
0%
Wednesday
Clear
68°20°
0%
Thursday
Clear
68°/ 52° 20°/ 11°
0%
Friday
Rain Showers
75°/ 58° 24°/ 14°
40%
Saturday
Rain Showers
68°20°
40%

Night: Clear this evening, then becoming partly cloudy. Not as cool with lows in the mid 40s. South winds 10 to 15 mph with gusts up to 25 mph.

Madison, MN

Tonight
Clear
45°7°
0%
Sunday
Sunny
68°/ 40° 20°/ 4°
0%
Monday
Sunny
62°/ 42° 17°/ 6°
0%
Tuesday
Sunny
68°/ 48° 20°/ 9°
0%
Wednesday
Sunny
72°/ 48° 22°/ 9°
0%
Thursday
Sunny
72°/ 55° 22°/ 13°
0%
Friday
Partly Cloudy
75°/ 58° 24°/ 14°
30%
Saturday
Rain Showers
72°22°
30%

Night: Not as cool. Mostly clear. Lows in the mid 40s. South winds 5 to 15 mph with gusts to around 50 mph.

Brookings, SD

Tonight
Clear
45°7°
0%
Sunday
Sunny
65°/ 42° 18°/ 6°
0%
Monday
Sunny
60°/ 45° 16°/ 7°
0%
Tuesday
Sunny
65°/ 48° 18°/ 9°
0%
Wednesday
Sunny
70°/ 48° 21°/ 9°
0%
Thursday
Sunny
72°/ 55° 22°/ 13°
0%
Friday
Mostly Cloudy
72°/ 58° 22°/ 14°
0%
Saturday
Rain Showers
68°20°
30%

Night: Clear, breezy and not as cool with lows in the mid 40s. South winds 15 to 25 mph. Gusts up to 40 mph this evening.

Ortonville, MN

Tonight
Cloudy
45°7°
0%
Sunday
Sunny
68°/ 42° 20°/ 6°
0%
Monday
Sunny
62°/ 42° 17°/ 6°
0%
Tuesday
Clear
68°20°
0%
Wednesday
Clear
68°20°
0%
Thursday
Clear
68°/ 52° 20°/ 11°
0%
Friday
Rain Showers
75°/ 58° 24°/ 14°
30%
Saturday
Rain Showers
68°20°
40%

Night: Clear this evening, then becoming partly cloudy. Not as cool with lows in the mid 40s. South winds 10 to 15 mph with gusts up to 25 mph.

Huron, SD

Tonight
Clear
45°7°
0%
Sunday
Sunny
68°/ 40° 20°/ 4°
0%
Monday
Sunny
62°/ 45° 17°/ 7°
0%
Tuesday
Sunny
68°/ 48° 20°/ 9°
0%
Wednesday
Sunny
70°/ 48° 21°/ 9°
0%
Thursday
Sunny
72°/ 55° 22°/ 13°
0%
Friday
Partly Cloudy
75°/ 58° 24°/ 14°
40%
Saturday
Rain Showers
68°20°
40%

Night: Mostly clear. Not as cool with lows in the mid 40s. South winds 15 to 20 mph with gusts up to 30 mph.

Granite Falls, MN

Tonight
Clear
45°7°
0%
Sunday
Sunny
68°/ 40° 20°/ 4°
0%
Monday
Sunny
62°/ 45° 17°/ 7°
0%
Tuesday
Sunny
68°/ 50° 20°/ 10°
0%
Wednesday
Sunny
72°/ 48° 22°/ 9°
0%
Thursday
Sunny
72°/ 55° 22°/ 13°
0%
Friday
Partly Cloudy
75°/ 58° 24°/ 14°
0%
Saturday
Rain Showers
72°22°
30%

Night: Not as cool. Clear. Lows in the mid 40s. South winds 10 to 15 mph with gusts to around 50 mph.

Tyler, MN

Tonight
Clear
45°7°
0%
Sunday
Sunny
65°/ 42° 18°/ 6°
0%
Monday
Sunny
60°/ 45° 16°/ 7°
0%
Tuesday
Sunny
65°/ 52° 18°/ 11°
0%
Wednesday
Sunny
70°/ 48° 21°/ 9°
0%
Thursday
Sunny
72°/ 55° 22°/ 13°
0%
Friday
Partly Cloudy
72°/ 58° 22°/ 14°
0%
Saturday
Rain Showers
68°20°
30%

Night: Clear, windy and not as cool with lows in the mid 40s. Southwest winds 20 to 30 mph with gusts up to 45 mph.

Gwinner, ND

Afternoon
Sunny
65°/ 45° 18°/ 7°
0%
Sunday
Sunny
65°/ 35° 18°/ 2°
0%
Monday
Sunny
60°/ 65° 16°/ 18°
0%
Tue Night
Clear
65°18°
0%
Wednesday
Clear
65°18°
0%
Thursday
Clear
65°/ 55° 18°/ 13°
0%
Friday
Rain Showers
75°24°
N/A

Day: Sunny. Highs in the mid 60s. Breezy. Southwest winds around 20 mph.

Night: Partly cloudy. Lows in the mid 40s. Breezy. Southwest winds 15 to 25 mph.

Howard, SD

Tonight
Clear
45°7°
0%
Sunday
Sunny
68°/ 42° 20°/ 6°
0%
Monday
Sunny
62°/ 45° 17°/ 7°
0%
Tuesday
Sunny
65°/ 50° 18°/ 10°
0%
Wednesday
Sunny
72°/ 48° 22°/ 9°
0%
Thursday
Sunny
72°/ 55° 22°/ 13°
0%
Friday
Partly Cloudy
75°/ 58° 24°/ 14°
40%
Saturday
Rain Showers
68°20°
40%

Night: Clear. Not as cool with lows in the mid 40s. South winds 15 to 20 mph with gusts up to 30 mph.

Names listed above may include county names.

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