Grass Lake, SD Hourly Weather Updates

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Grass Lake Weather Map
UTC Time: 9/13/2026, 01:16
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Aeronautical Observation: Automated synoptic observations via NWS Gateway.
Auto-refresh in: 5:02

Grass Lake, SD Regional Weather

Expires:202609130200;;354434
ASUS43 KFSD 130110
RWRSD 

WEATHER ROUNDUP FOR SOUTH DAKOTA
NATIONAL WEATHER SERVICE SIOUX FALLS SD
800 PM CDT SAT SEP 12 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>070-130200-
SOUTHEAST SOUTH DAKOTA
  
CITY           SKY/WX    TMP DP  RH WIND       PRES   REMARKS
SIOUX FALLS    MOCLDY    63  46  54 NW7       30.06R TC  17           
HURON          MOCLDY    59  47  64 N3        30.07R TC  15           
CHAMBERLAIN    CLEAR     62  47  59 NW5       30.11S TC  16           
MADISON        MOCLDY    59  50  72 NW5       30.06R TC  15           
MITCHELL       PTCLDY    62  47  57 NW5       30.08R TC  17           
YANKTON        CLEAR     64  47  53 NW8       30.06R 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

Today
Partly Cloudy
65°/ 40° 18°/
20%
Sunday
Sunny
70°/ 48° 21°/
0%
Monday
Thunderstorms
72°/ 42° 22°/
N/A
Tuesday
Sunny
68°/ 42° 20°/
0%
Wednesday
Rain Showers
68°/ 42° 20°/
40%
Thursday
Sunny
72°/ 45° 22°/
0%

Day: Partly sunny. Highs in the mid 60s. Northwest winds 10 to 15 mph.

Night: Mostly cloudy. A slight chance of showers after midnight. Lows around 40. North winds around 10 mph in the evening, becoming light and variable. Chance of rain 20 percent.

Clark, SD

Tonight
Mostly Cloudy
50°10°
0%
Sunday
Rain Showers
68°/ 55° 20°/ 13°
50%
Monday
Thunderstorms
70°/ 48° 21°/
100%
Tuesday
Sunny
65°/ 50° 18°/ 10°
0%
Wed-Wed Night
Rain Showers
65°18°
20%
Thursday
Partly Cloudy
68°/ 52° 20°/ 11°
30%
Fri Night
Rain Showers
52°11°
30%

Night: Mostly cloudy. Lows around 50. Northwest winds 5 to 10 mph with gusts up to 20 mph, becoming northeast after midnight.

Webster, SD

Tonight
Mostly Cloudy
50°10°
0%
Sunday
Rain Showers
68°/ 55° 20°/ 13°
50%
Monday
Thunderstorms
68°/ 48° 20°/
100%
Tue-Tue Night
Clear
65°18°
0%
Wednesday
Rain Showers
65°/ 52° 18°/ 11°
30%
Thursday
Partly Cloudy
68°/ 52° 20°/ 11°
30%
Fri-Fri Night
Rain Showers
68°20°
20%

Night: Mostly cloudy. Lows around 50. Northwest winds 5 to 10 mph with gusts up to 20 mph, becoming north after midnight.

Sisseton, SD

Tonight
Mostly Cloudy
48°
0%
Sunday
Rain Showers
68°/ 50° 20°/ 10°
20%
Monday
Thunderstorms
68°/ 50° 20°/ 10°
100%
Tue-Tue Night
Clear
65°18°
0%
Wed-Wed Night
Rain Showers
65°18°
20%
Thursday
Partly Cloudy
70°/ 52° 21°/ 11°
20%
Fri Night
Rain Showers
52°11°
20%

Night: Mostly cloudy. Lows in the upper 40s. Northwest winds 10 to 15 mph, diminishing to around 5 mph after midnight.

Hayti, SD

Tonight
Rain Showers
48°
20%
Sunday
Rain Showers
68°/ 52° 20°/ 11°
50%
Monday
Thunderstorms
72°/ 48° 22°/
100%
Tuesday
Sunny
68°/ 48° 20°/
0%
Wed-Wed Night
Rain Showers
65°18°
20%
Thursday
Partly Cloudy
70°/ 52° 21°/ 11°
30%
Friday
Thunderstorms
70°/ 52° 21°/ 11°
30%

Night: Mostly cloudy. A slight chance of showers after midnight. Lows in the upper 40s. Northwest winds 5 to 10 mph with gusts up to 20 mph, becoming northeast after midnight. Chance of rain 20 percent.

Milbank, SD

Tonight
Mostly Cloudy
48°
0%
Sunday
Rain Showers
68°/ 52° 20°/ 11°
40%
Monday
Thunderstorms
70°/ 52° 21°/ 11°
100%
Tuesday
Sunny
68°/ 48° 20°/
0%
Wed-Wed Night
Rain Showers
65°18°
20%
Thursday
Partly Cloudy
70°/ 52° 21°/ 11°
30%
Fri Night
Rain Showers
52°11°
20%

Night: Mostly cloudy. Lows in the upper 40s. Northwest winds 5 to 10 mph.

Clear Lake, SD

Tonight
Mostly Cloudy
48°
0%
Sunday
Rain Showers
68°/ 52° 20°/ 11°
30%
Monday
Thunderstorms
70°/ 52° 21°/ 11°
100%
Tuesday
Sunny
68°/ 48° 20°/
0%
Wednesday
Rain Showers
65°/ 52° 18°/ 11°
30%
Thursday
Partly Cloudy
68°/ 52° 20°/ 11°
30%
Friday
Thunderstorms
68°/ 52° 20°/ 11°
30%

Night: Mostly cloudy. Lows in the upper 40s. Northwest winds 5 to 10 mph.

Redfield, SD

Tonight
Mostly Cloudy
48°
0%
Sunday
Rain Showers
70°/ 52° 21°/ 11°
70%
Monday
Thunderstorms
72°/ 48° 22°/
100%
Tuesday
Sunny
68°/ 48° 20°/
0%
Wed-Wed Night
Rain Showers
65°18°
20%
Thursday
Partly Cloudy
70°/ 52° 21°/ 11°
30%
Friday
Rain Showers
70°/ 52° 21°/ 11°
30%

Night: Mostly cloudy. Lows in the upper 40s. Northwest winds 5 to 10 mph with gusts up to 20 mph, becoming northeast after midnight.

Aberdeen, SD

Tonight
Rain Showers
48°
20%
Sunday
Rain Showers
68°/ 52° 20°/ 11°
70%
Monday
Thunderstorms
72°/ 45° 22°/
100%
Tuesday
Sunny
68°/ 45° 20°/
0%
Wednesday
Rain Showers
65°/ 48° 18°/
30%
Thursday
Partly Cloudy
70°/ 48° 21°/
20%
Fri Night
Rain Showers
48°
20%

Night: Mostly cloudy. A slight chance of showers after midnight. Lows in the upper 40s. Northwest winds 10 to 15 mph, becoming north around 5 mph after midnight. Chance of rain 20 percent.

Britton, SD

Tonight
Rain Showers
48°
20%
Sunday
Rain Showers
65°/ 52° 18°/ 11°
50%
Monday
Thunderstorms
68°/ 48° 20°/
100%
Tue-Tue Night
Clear
65°18°
0%
Wed-Wed Night
Rain Showers
65°18°
20%
Thursday
Partly Cloudy
68°/ 52° 20°/ 11°
20%
Fri Night
Rain Showers
52°11°
20%

Night: Mostly cloudy. A slight chance of showers after midnight. Lows in the upper 40s. Northwest winds 10 to 15 mph with gusts up to 25 mph, becoming north around 5 mph after midnight. Chance of rain 20 percent.

De Smet, SD

Tonight
Rain Showers
50°10°
20%
Sunday
Rain Showers
68°/ 55° 20°/ 13°
50%
Monday
Thunderstorms
72°/ 48° 22°/
100%
Tuesday
Sunny
68°/ 50° 20°/ 10°
0%
Wednesday
Mostly Cloudy
65°/ 52° 18°/ 11°
0%
Thursday
Partly Cloudy
68°/ 52° 20°/ 11°
30%
Friday
Rain Showers
68°/ 52° 20°/ 11°
30%

Night: Mostly cloudy. A slight chance of showers after midnight. Lows around 50. North winds 5 to 10 mph, becoming northeast after midnight. Chance of rain 20 percent.

Wheaton, MN

Tonight
Mostly Cloudy
48°
0%
Sunday
Rain Showers
68°/ 48° 20°/
20%
Monday
Thunderstorms
65°/ 48° 18°/
100%
Tue-Tue Night
Clear
68°20°
0%
Wed-Wed Night
Rain Showers
68°20°
20%
Thursday
Partly Cloudy
70°/ 48° 21°/
20%
Fri Night
Rain Showers
48°
20%

Night: Mostly cloudy. Lows in the upper 40s. Northwest winds 5 to 10 mph.

Madison, MN

Tonight
Mostly Cloudy
48°
0%
Sunday
Rain Showers
70°/ 50° 21°/ 10°
20%
Monday
Rain Showers
70°/ 52° 21°/ 11°
100%
Tuesday
Sunny
70°/ 48° 21°/
0%
Wednesday
Partly Cloudy
68°/ 52° 20°/ 11°
0%
Thursday
Partly Cloudy
72°/ 50° 22°/ 10°
30%
Friday
Rain Showers
72°/ 52° 22°/ 11°
30%

Night: Mostly cloudy. Lows in the upper 40s. Northwest winds up to 10 mph.

Brookings, SD

Tonight
Rain Showers
48°
20%
Sunday
Rain Showers
68°/ 52° 20°/ 11°
50%
Monday
Thunderstorms
72°/ 50° 22°/ 10°
100%
Tuesday
Sunny
68°/ 48° 20°/
0%
Wednesday
Rain Showers
65°/ 52° 18°/ 11°
30%
Thursday
Mostly Cloudy
68°/ 52° 20°/ 11°
30%
Friday
Rain Showers
68°/ 52° 20°/ 11°
30%

Night: Mostly cloudy. A slight chance of showers after midnight. Lows in the upper 40s. Northwest winds 5 to 10 mph, becoming northeast after midnight. Chance of rain 20 percent.

Ortonville, MN

Tonight
Mostly Cloudy
48°
0%
Sunday
Rain Showers
68°/ 50° 20°/ 10°
20%
Monday
Thunderstorms
68°/ 50° 20°/ 10°
100%
Tue-Tue Night
Clear
68°20°
0%
Wed-Wed Night
Rain Showers
65°18°
20%
Thursday
Partly Cloudy
70°/ 50° 21°/ 10°
20%
Friday
Rain Showers
70°/ 52° 21°/ 11°
30%

Night: Mostly cloudy. Lows in the upper 40s. Northwest winds 5 to 10 mph.

Huron, SD

Tonight
Mostly Cloudy
52°11°
0%
Sunday
Rain Showers
72°/ 55° 22°/ 13°
50%
Monday
Thunderstorms
75°/ 48° 24°/
100%
Tuesday
Sunny
68°/ 50° 20°/ 10°
0%
Wednesday
Rain Showers
65°/ 52° 18°/ 11°
30%
Thursday
Sunny
70°/ 52° 21°/ 11°
30%
Friday
Rain Showers
70°/ 52° 21°/ 11°
30%

Night: Mostly cloudy. Lows in the lower 50s. North winds 5 to 10 mph, becoming northeast after midnight.

Granite Falls, MN

Tonight
Mostly Cloudy
50°10°
0%
Sunday
Rain Showers
70°/ 52° 21°/ 11°
20%
Monday
Rain Showers
70°/ 52° 21°/ 11°
100%
Tuesday
Sunny
70°/ 48° 21°/
0%
Wednesday
Rain Showers
65°/ 52° 18°/ 11°
30%
Thursday
Partly Cloudy
70°/ 52° 21°/ 11°
30%
Friday
Rain Showers
70°/ 52° 21°/ 11°
30%

Night: Mostly cloudy. Lows around 50. Northwest winds up to 10 mph.

Tyler, MN

Tonight
Mostly Cloudy
50°10°
0%
Sunday
Rain Showers
68°/ 52° 20°/ 11°
50%
Monday
Thunderstorms
70°/ 52° 21°/ 11°
100%
Tuesday
Sunny
68°/ 48° 20°/
0%
Wednesday
Rain Showers
65°/ 52° 18°/ 11°
30%
Thursday
Partly Cloudy
68°/ 52° 20°/ 11°
30%
Friday
Rain Showers
68°/ 52° 20°/ 11°
30%

Night: Partly cloudy this evening, then becoming mostly cloudy. Lows around 50. Northwest winds 5 to 10 mph.

Gwinner, ND

Tonight
Rain Showers
45°
30%
Sunday
Sunny
65°/ 45° 18°/
70%
Monday
Thunderstorms
65°/ 45° 18°/
100%
Tue-Tue Night
Clear
65°18°
0%
Wednesday
Rain Showers
65°/ 45° 18°/
N/A
Thu-Thu Night
Cloudy
70°21°
0%
Friday
Rain Showers
70°21°
N/A

Night: Mostly cloudy. A chance of showers after midnight. Lows in the mid 40s. Northwest winds up to 10 mph. Chance of rain 30 percent.

Howard, SD

Tonight
Sprinkles
50°10°
0%
Sunday
Rain Showers
70°/ 55° 21°/ 13°
50%
Monday
Thunderstorms
75°/ 50° 24°/ 10°
100%
Tuesday
Sunny
68°/ 50° 20°/ 10°
0%
Wednesday
Rain Showers
65°/ 55° 18°/ 13°
30%
Thursday
Mostly Cloudy
72°/ 52° 22°/ 11°
40%
Friday
Rain Showers
72°/ 52° 22°/ 11°
40%

Night: Partly cloudy this evening, then mostly cloudy with a chance of sprinkles after midnight. Lows around 50. North winds 5 to 10 mph, becoming northeast after midnight.

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