Castle Rock, SD Weather Forecast & Current Conditions

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Castle Rock, SD Weather Maps

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Castle Rock Weather Map
UTC Time: 9/21/2026, 07:31
Your Time:
Aeronautical Observation: Automated synoptic observations via NWS Gateway.
Auto-refresh in: 5:02

Castle Rock, SD Regional Weather

Expires:202609210800;;805879
ASUS43 KFSD 210710
RWRSD 

WEATHER ROUNDUP FOR SOUTH DAKOTA
NATIONAL WEATHER SERVICE SIOUX FALLS SD
200 AM CDT MON SEP 21 2026

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



SDZ012>016-024>037-041>051-057-063-072>074-210800-
SOUTHWEST AND SOUTH CENTRAL SOUTH DAKOTA
  
CITY           SKY/WX    TMP DP  RH WIND       PRES   REMARKS
RAPID CTY ARPT CLOUDY    54  54 100 NE6       30.17S TC  12           
PIERRE         CLOUDY    56  55  97 E8        30.15S TC  13           
CUSTER         CLOUDY    47  47 100 NW3       30.21S TC   8           
ELLSWORTH AFB  CLOUDY    55  54  94 E8        30.14S FOG     TC  13   
PHILIP         LGT RAIN  56  55  97 E7        30.15S FOG     TC  13   
SPEARFISH      CLOUDY    52  52 100 E8        30.19S TC  11           
WINNER         CLOUDY    57  57 100 E3        30.14S FOG     TC  14   
$$
 

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

Castle Rock, SD

Overnight
Rain Showers
48°
50%
Monday
Rain Showers
62°/ 45° 17°/
50%
Tuesday
Cloudy
70°/ 52° 21°/ 11°
0%
Wednesday
Thunderstorms
78°/ 52° 26°/ 11°
30%
Thursday
Cloudy
80°/ 52° 27°/ 11°
0%
Friday
Cloudy
82°/ 55° 28°/ 13°
0%
Saturday
Cloudy
78°/ 50° 26°/ 10°
0%
Sunday
Cloudy
72°22°
0%

Night: Cloudy with a 50 percent chance of showers. Areas of fog. Lows in the upper 40s. East winds 5 to 10 mph with gusts up to 20 mph.

Buffalo, SD

Overnight
Rain Showers
48°
50%
Monday
Rain Showers
62°/ 45° 17°/
40%
Tuesday
Cloudy
68°/ 50° 20°/ 10°
20%
Wednesday
Thunderstorms
75°/ 52° 24°/ 11°
50%
Thursday
Cloudy
82°/ 55° 28°/ 13°
0%
Friday
Cloudy
80°/ 55° 27°/ 13°
0%
Saturday
Cloudy
75°/ 48° 24°/
0%
Sunday
Cloudy
68°20°
0%

Night: Cloudy with a 50 percent chance of showers. Patchy fog. Lows in the upper 40s. East winds 5 to 10 mph.

Faith, SD

Overnight
Rain Showers
48°
90%
Monday
Rain Showers
62°/ 45° 17°/
50%
Tuesday
Mostly Cloudy
68°/ 52° 20°/ 11°
0%
Wednesday
Thunderstorms
75°/ 52° 24°/ 11°
40%
Thursday
Cloudy
78°/ 52° 26°/ 11°
0%
Friday
Rain Showers
78°/ 55° 26°/ 13°
20%
Saturday
Cloudy
78°/ 52° 26°/ 11°
0%
Sunday
Cloudy
72°22°
0%

Night: Showers. Patchy fog. Lows in the upper 40s. East winds 10 to 15 mph. Chance of rain 90 percent.

Usta, SD

Overnight
Rain Showers
48°
70%
Monday
Rain Showers
62°/ 45° 17°/
50%
Tuesday
Mostly Cloudy
68°/ 50° 20°/ 10°
0%
Wednesday
Thunderstorms
75°/ 52° 24°/ 11°
40%
Thursday
Cloudy
78°/ 52° 26°/ 11°
0%
Friday
Cloudy
78°/ 55° 26°/ 13°
0%
Saturday
Cloudy
78°/ 50° 26°/ 10°
0%
Sunday
Cloudy
72°22°
0%

Night: Showers likely. Patchy fog. Lows in the upper 40s. East winds 5 to 10 mph. Chance of rain 70 percent.

Spearfish, SD

Overnight
Rain Showers
48°
50%
Monday
Rain Showers
62°/ 48° 17°/
40%
Tuesday
Cloudy
72°/ 55° 22°/ 13°
0%
Wednesday
Thunderstorms
75°/ 55° 24°/ 13°
20%
Thursday
Cloudy
78°/ 55° 26°/ 13°
0%
Friday
Cloudy
82°/ 58° 28°/ 14°
0%
Saturday
Cloudy
75°/ 52° 24°/ 11°
0%
Sunday
Cloudy
72°22°
0%

Night: Cloudy with a 50 percent chance of showers. Widespread fog. Lows in the upper 40s. East winds around 5 mph.

Sturgis, SD

Overnight
Rain Showers
48°
70%
Monday
Rain Showers
62°/ 48° 17°/
50%
Tuesday
Cloudy
68°/ 55° 20°/ 13°
0%
Wednesday
Thunderstorms
78°/ 55° 26°/ 13°
20%
Thursday
Cloudy
78°/ 55° 26°/ 13°
0%
Friday
Cloudy
80°/ 58° 27°/ 14°
0%
Saturday
Cloudy
78°/ 52° 26°/ 11°
0%
Sunday
Cloudy
72°22°
0%

Night: Showers likely. Widespread fog. Lows in the upper 40s. East winds 5 to 10 mph. Chance of rain 70 percent.

Ellsworth AFB, SD

Overnight
Rain Showers
48°
70%
Monday
Rain Showers
62°/ 48° 17°/
50%
Tuesday
Cloudy
68°/ 52° 20°/ 11°
0%
Wednesday
Thunderstorms
78°/ 52° 26°/ 11°
20%
Thursday
Cloudy
80°/ 55° 27°/ 13°
20%
Friday
Cloudy
80°/ 55° 27°/ 13°
0%
Saturday
Cloudy
78°/ 52° 26°/ 11°
0%
Sunday
Cloudy
72°22°
0%

Night: Showers likely. Areas of fog. Lows in the upper 40s. East winds 5 to 10 mph. Chance of rain 70 percent.

Lead, SD

Overnight
Rain Showers
42°
50%
Monday
Thunderstorms
55°/ 40° 13°/
60%
Tuesday
Cloudy
65°/ 48° 18°/
0%
Wednesday
Thunderstorms
68°/ 45° 20°/
20%
Thursday
Cloudy
72°/ 48° 22°/
0%
Friday
Cloudy
72°/ 48° 22°/
0%
Saturday
Cloudy
70°/ 45° 21°/
0%
Sunday
Sunny
65°18°
0%

Night: Cloudy with a 50 percent chance of showers. Widespread fog. Lows in the lower 40s. South winds around 5 mph.

Colony, WY

Overnight
Rain Showers
48°
40%
Monday
Rain Showers
62°/ 45° 17°/
40%
Tuesday
Cloudy
72°/ 50° 22°/ 10°
20%
Wednesday
Thunderstorms
78°/ 50° 26°/ 10°
20%
Thursday
Cloudy
80°/ 52° 27°/ 11°
0%
Friday
Cloudy
82°/ 52° 28°/ 11°
0%
Saturday
Sunny
75°/ 48° 24°/
0%
Sunday
Cloudy
72°22°
0%

Night: Cloudy with a 40 percent chance of showers. Widespread fog. Lows in the upper 40s. East winds 5 to 10 mph.

Lemmon, SD

Overnight
Rain Showers
48°
50%
Monday
Rain Showers
62°/ 45° 17°/
20%
Tuesday
Cloudy
65°/ 48° 18°/
0%
Wednesday
Thunderstorms
75°/ 52° 24°/ 11°
50%
Thursday
Cloudy
78°/ 52° 26°/ 11°
0%
Friday
Cloudy
78°/ 55° 26°/ 13°
0%
Saturday
Cloudy
75°/ 48° 24°/
20%
Sunday
Cloudy
68°20°
0%

Night: Cloudy with a 50 percent chance of showers. Patchy fog. Lows in the upper 40s. East winds 5 to 10 mph.

Sundance, WY

Overnight
Rain Showers
45°
40%
Monday
Thunderstorms
62°/ 45° 17°/
70%
Tuesday
Cloudy
68°/ 52° 20°/ 11°
20%
Wednesday
Cloudy
72°/ 50° 22°/ 10°
0%
Thursday
Cloudy
78°/ 55° 26°/ 13°
0%
Friday
Rain Showers
78°/ 52° 26°/ 11°
20%
Saturday
Sunny
72°/ 48° 22°/
0%
Sunday
Cloudy
70°21°
0%

Night: Cloudy with a 40 percent chance of showers. Widespread fog. Lows in the mid 40s. Northeast winds around 5 mph.

Box Elder, SD

Overnight
Rain Showers
48°
90%
Monday
Rain Showers
62°/ 48° 17°/
50%
Tuesday
Mostly Cloudy
68°/ 52° 20°/ 11°
0%
Wednesday
Cloudy
78°/ 55° 26°/ 13°
20%
Thursday
Cloudy
80°/ 55° 27°/ 13°
20%
Friday
Rain Showers
80°/ 55° 27°/ 13°
20%
Saturday
Sunny
78°/ 52° 26°/ 11°
0%
Sunday
Cloudy
72°22°
0%

Night: Showers. Areas of fog. Lows in the upper 40s. Northeast winds 10 to 15 mph. Chance of rain 90 percent.

Moorcroft, WY

Overnight
Rain Showers
45°
20%
Monday
Rain Showers
65°/ 42° 18°/
50%
Tuesday
Cloudy
72°/ 48° 22°/
20%
Wednesday
Cloudy
78°/ 45° 26°/
0%
Thursday
Cloudy
82°/ 52° 28°/ 11°
0%
Friday
Cloudy
82°/ 50° 28°/ 10°
0%
Saturday
Sunny
78°/ 45° 26°/
0%
Sunday
Cloudy
72°22°
0%

Night: Mostly cloudy with a 20 percent chance of showers. Areas of fog. Lows in the mid 40s. Northeast winds around 5 mph.

Rapid City, SD

Overnight
Rain Showers
48°
70%
Monday
Rain Showers
60°/ 48° 16°/
50%
Tuesday
Cloudy
68°/ 55° 20°/ 13°
0%
Wednesday
Cloudy
78°/ 55° 26°/ 13°
0%
Thursday
Cloudy
78°/ 55° 26°/ 13°
0%
Friday
Cloudy
78°/ 58° 26°/ 14°
0%
Saturday
Sunny
78°/ 52° 26°/ 11°
0%
Sunday
Cloudy
72°22°
0%

Night: Showers likely. Widespread fog. Lows in the upper 40s. Northeast winds 5 to 10 mph. Chance of rain 70 percent.

Hill City, SD

Overnight
Rain Showers
45°
70%
Monday
Thunderstorms
55°/ 45° 13°/
50%
Tuesday
Cloudy
62°/ 52° 17°/ 11°
20%
Wednesday
Cloudy
70°/ 50° 21°/ 10°
0%
Thursday
Cloudy
72°/ 52° 22°/ 11°
0%
Friday
Cloudy
72°/ 52° 22°/ 11°
0%
Saturday
Sunny
72°/ 48° 22°/
0%
Sunday
Cloudy
68°20°
0%

Night: Cloudy with showers likely. Widespread fog. Lows in the mid 40s. North winds around 5 mph. Chance of rain 70 percent.

Bowman, ND

Tonight
Rain Showers
45°
50%
Monday
Mostly Cloudy
62°/ 42° 17°/
0%
Tuesday
Cloudy
65°/ 48° 18°/
30%
Wednesday
Thunderstorms
75°/ 48° 24°/
60%
Thursday
Sunny
80°/ 48° 27°/
0%
Friday
Sunny
78°/ 52° 26°/ 11°
0%
Saturday
Sunny
75°/ 45° 24°/
20%
Sunday
Rain Showers
68°20°
20%

Night: Cloudy. Scattered showers late in the evening, then isolated showers after midnight. Patchy fog after midnight. Lows in the mid 40s. East winds 10 to 15 mph. Chance of rain 50 percent.

Dupree, SD

Overnight
Rain Showers
48°
90%
Monday
Rain Showers
62°/ 45° 17°/
40%
Tuesday
Cloudy
65°/ 50° 18°/ 10°
0%
Wednesday
Thunderstorms
75°/ 52° 24°/ 11°
50%
Thursday
Cloudy
78°/ 52° 26°/ 11°
20%
Friday
Rain Showers
78°/ 55° 26°/ 13°
20%
Saturday
Cloudy
78°/ 52° 26°/ 11°
0%
Sunday
Cloudy
72°22°
0%

Night: Showers. Patchy fog. Lows in the upper 40s. East winds 5 to 10 mph. Chance of rain 90 percent.

Hermosa, SD

Overnight
Rain Showers
48°
50%
Monday
Rain Showers
62°/ 48° 17°/
50%
Tuesday
Rain Showers
68°/ 52° 20°/ 11°
20%
Wednesday
Cloudy
78°/ 52° 26°/ 11°
0%
Thursday
Rain Showers
78°/ 55° 26°/ 13°
20%
Friday
Cloudy
80°/ 55° 27°/ 13°
0%
Saturday
Sunny
78°/ 52° 26°/ 11°
0%
Sunday
Cloudy
72°22°
0%

Night: Cloudy with a 50 percent chance of showers. Areas of fog. Lows in the upper 40s. Northeast winds 5 to 10 mph.

Hettinger, ND

Tonight
Rain Showers
45°
30%
Monday
Mostly Cloudy
62°/ 40° 17°/
0%
Tuesday
Partly Cloudy
62°/ 45° 17°/
30%
Wednesday
Thunderstorms
72°/ 48° 22°/
60%
Thursday
Sunny
75°/ 48° 24°/
0%
Friday
Partly Cloudy
75°/ 52° 24°/ 11°
0%
Saturday
Sunny
72°/ 45° 22°/
20%
Sunday
Rain Showers
68°20°
20%

Night: Cloudy with scattered showers. Patchy fog after midnight. Lows in the mid 40s. East winds 5 to 10 mph. Chance of rain 30 percent.

Folsom, SD

Overnight
Rain Showers
48°
50%
Monday
Rain Showers
62°/ 45° 17°/
30%
Tuesday
Mostly Cloudy
70°/ 52° 21°/ 11°
0%
Wednesday
Cloudy
78°/ 52° 26°/ 11°
0%
Thursday
Rain Showers
82°/ 52° 28°/ 11°
20%
Friday
Cloudy
82°/ 55° 28°/ 13°
0%
Saturday
Sunny
80°/ 52° 27°/ 11°
0%
Sunday
Cloudy
75°24°
0%

Night: Cloudy with a 50 percent chance of showers. Areas of fog. Lows in the upper 40s. Northeast winds 5 to 10 mph.

Names listed above may include county names.

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