Dewey, SD Weather Forecast & Current Conditions

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Dewey Weather Map
UTC Time: 9/18/2026, 13:04
Your Time:
Aeronautical Observation: Automated synoptic observations via NWS Gateway.
Auto-refresh in: 5:02

Dewey, SD Regional Weather

Expires:202609181400;;655723
ASUS43 KFSD 181302
RWRSD 

WEATHER ROUNDUP FOR SOUTH DAKOTA
NATIONAL WEATHER SERVICE SIOUX FALLS SD
800 AM CDT FRI SEP 18 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>074-181400-
SOUTHWEST AND SOUTH CENTRAL SOUTH DAKOTA
  
CITY           SKY/WX    TMP DP  RH WIND       PRES   REMARKS
RAPID CTY ARPT CLOUDY    61  61 100 CALM      30.08R TC  16           
PIERRE         LGT RAIN  61  60  97 E13       30.03S FOG     TC  16   
CUSTER         PTCLDY    56  54  93 W7        30.17S TC  13           
ELLSWORTH AFB  MOCLDY    59  58  97 CALM      30.05R TC  15           
PHILIP         CLOUDY    65  64  97 CALM      30.03S TC  18           
SPEARFISH      FOG       57  57 100 CALM      30.12R VSB 1/2 TC  14   
WINNER         CLOUDY    64  64 100 VRB3      30.04S FOG     TC  18   
$$
 

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

Dewey, SD

This Morning
Cloudy
58°/ 55° 14°/ 13°
70%
Today
Cloudy
75°24°
0%
Saturday
Thunderstorms
68°/ 52° 20°/ 11°
70%
Sunday
Thunderstorms
62°/ 48° 17°/
N/A
Monday
Rain Showers
62°/ 48° 17°/
50%
Tuesday
Rain Showers
68°/ 52° 20°/ 11°
40%
Wednesday
Thunderstorms
75°/ 52° 24°/ 11°
30%
Thursday
Sunny
78°26°
0%

Day: Cloudy. Patchy fog. Near steady temperature in the upper 50s. West winds around 5 mph.

Night: Mostly cloudy. A chance of showers with a slight chance of thunderstorms in the evening, then showers likely with a chance of thunderstorms after midnight. Lows in the mid 50s. East winds 5 to 10 mph. Gusts up to 20 mph in the evening. Chance of rain 70 percent.

Hot Springs, SD

This Morning
Cloudy
62°/ 58° 17°/ 14°
70%
Today
Cloudy
78°26°
0%
Saturday
Thunderstorms
68°/ 55° 20°/ 13°
70%
Sunday
Thunderstorms
65°/ 50° 18°/ 10°
90%
Monday
Rain Showers
65°/ 50° 18°/ 10°
40%
Tuesday
Rain Showers
75°/ 52° 24°/ 11°
40%
Wednesday
Rain Showers
78°/ 52° 26°/ 11°
20%
Thursday
Sunny
80°27°
0%

Day: Cloudy. Patchy fog. Near steady temperature in the lower 60s. Northwest winds around 5 mph.

Night: Mostly cloudy with a slight chance of thunderstorms. A chance of showers in the evening, then showers likely after midnight. Lows in the upper 50s. East winds 10 to 15 mph. Gusts up to 25 mph in the evening. Chance of rain 70 percent.

Ardmore, SD

This Morning
Cloudy
60°/ 55° 16°/ 13°
70%
Today
Cloudy
78°26°
0%
Saturday
Thunderstorms
70°/ 52° 21°/ 11°
70%
Sunday
Thunderstorms
65°/ 48° 18°/
90%
Monday
Rain Showers
68°/ 50° 20°/ 10°
20%
Tuesday
Rain Showers
75°/ 52° 24°/ 11°
40%
Wednesday
Rain Showers
78°/ 52° 26°/ 11°
20%
Thursday
Sunny
82°28°
0%

Day: Cloudy. Patchy fog. Near steady temperature around 60. Southeast winds around 5 mph.

Night: Mostly cloudy. A chance of showers and thunderstorms in the evening, then showers likely with a slight chance of thunderstorms after midnight. Lows in the mid 50s. East winds 10 to 20 mph. Chance of rain 70 percent.

Newcastle, WY

This Morning
Cloudy
60°/ 55° 16°/ 13°
70%
Today
Cloudy
78°26°
0%
Saturday
Thunderstorms
70°/ 52° 21°/ 11°
90%
Sunday
Thunderstorms
65°/ 48° 18°/
80%
Monday
Rain Showers
65°/ 48° 18°/
40%
Tuesday
Cloudy
72°/ 50° 22°/ 10°
40%
Wednesday
Thunderstorms
75°/ 48° 24°/
20%
Thursday
Sunny
78°26°
0%

Day: Cloudy. Patchy fog. Near steady temperature around 60. South winds around 5 mph.

Night: Mostly cloudy with a chance of thunderstorms. A chance of showers in the evening, then showers likely after midnight. Lows in the mid 50s. Southeast winds 10 to 15 mph. Chance of rain 70 percent.

Hill City, SD

This Morning
Thunderstorms
55°/ 52° 13°/ 11°
70%
Today
Thunderstorms
75°24°
20%
Saturday
Thunderstorms
65°/ 50° 18°/ 10°
90%
Sunday
Thunderstorms
58°/ 48° 14°/
N/A
Monday
Rain Showers
58°/ 48° 14°/
70%
Tuesday
Rain Showers
65°/ 50° 18°/ 10°
40%
Wednesday
Thunderstorms
72°/ 50° 22°/ 10°
40%
Thursday
Sunny
75°24°
0%

Day: Cloudy with a slight chance of showers and thunderstorms. Patchy fog. Near steady temperature in the mid 50s. West winds around 5 mph. Chance of rain 20 percent.

Night: Mostly cloudy with a slight chance of thunderstorms. A chance of showers in the evening, then showers likely after midnight. Lows in the lower 50s. East winds around 5 mph, becoming west after midnight. Chance of rain 70 percent.

Lead, SD

This Morning
Thunderstorms
55°/ 48° 13°/
70%
Today
Cloudy
72°22°
0%
Saturday
Thunderstorms
62°/ 45° 17°/
90%
Sunday
Thunderstorms
55°/ 42° 13°/
N/A
Monday
Rain Showers
58°/ 42° 14°/
70%
Tuesday
Rain Showers
68°/ 45° 20°/
20%
Wednesday
Thunderstorms
70°/ 45° 21°/
40%
Thursday
Sunny
72°22°
0%

Day: Cloudy with a slight chance of showers and thunderstorms. Patchy fog. Near steady temperature in the mid 50s. Southwest winds around 5 mph. Chance of rain 20 percent.

Night: Mostly cloudy with a slight chance of thunderstorms. A chance of showers in the evening, then showers likely after midnight. Lows in the upper 40s. Southeast winds around 5 mph, becoming southwest after midnight. Chance of rain 70 percent.

Hermosa, SD

This Morning
Thunderstorms
58°/ 55° 14°/ 13°
60%
Today
Cloudy
78°26°
0%
Saturday
Thunderstorms
68°/ 52° 20°/ 11°
70%
Sunday
Thunderstorms
62°/ 50° 17°/ 10°
N/A
Monday
Rain Showers
65°/ 50° 18°/ 10°
50%
Tuesday
Rain Showers
72°/ 52° 22°/ 11°
40%
Wednesday
Thunderstorms
78°/ 52° 26°/ 11°
30%
Thursday
Sunny
80°27°
0%

Day: Cloudy with a slight chance of showers and thunderstorms. Patchy fog. Near steady temperature in the upper 50s. Northwest winds around 5 mph. Chance of rain 20 percent.

Night: Mostly cloudy. A slight chance of showers in the evening, then showers likely with a slight chance of thunderstorms after midnight. Lows in the mid 50s. East winds 5 to 10 mph. Gusts up to 20 mph in the evening. Chance of rain 60 percent.

Rochelle, WY

This Morning
Mostly Cloudy
58°/ 55° 14°/ 13°
70%
Today
Cloudy
78°26°
0%
Saturday
Thunderstorms
70°/ 52° 21°/ 11°
90%
Sunday
Thunderstorms
65°/ 48° 18°/
90%
Monday
Rain Showers
65°/ 48° 18°/
20%
Tuesday
Cloudy
72°/ 50° 22°/ 10°
20%
Wednesday
Rain Showers
78°/ 48° 26°/
20%
Thursday
Sunny
78°26°
0%

Day: Mostly cloudy. Near steady temperature in the upper 50s. South winds around 5 mph.

Night: Mostly cloudy with showers likely. A chance of thunderstorms in the evening, then a slight chance of thunderstorms after midnight. Lows in the mid 50s. Southeast winds 5 to 10 mph with gusts up to 20 mph. Chance of rain 70 percent.

Sundance, WY

This Morning
Cloudy
58°/ 52° 14°/ 11°
70%
Today
Cloudy
75°24°
0%
Saturday
Thunderstorms
65°/ 52° 18°/ 11°
90%
Sunday
Thunderstorms
60°/ 48° 16°/
90%
Monday
Rain Showers
62°/ 48° 17°/
70%
Tuesday
Cloudy
72°/ 52° 22°/ 11°
20%
Wednesday
Thunderstorms
75°/ 50° 24°/ 10°
20%
Thursday
Sunny
75°24°
0%

Day: Cloudy. Patchy fog. Near steady temperature in the upper 50s. South winds around 5 mph.

Night: Partly cloudy in the evening, then becoming mostly cloudy. A chance of thunderstorms. A chance of showers in the evening, then showers likely after midnight. Lows in the lower 50s. Southeast winds 5 to 10 mph. Chance of rain 70 percent.

Oral, SD

This Morning
Cloudy
62°/ 55° 17°/ 13°
50%
Today
Cloudy
78°26°
0%
Saturday
Thunderstorms
70°/ 55° 21°/ 13°
70%
Sunday
Thunderstorms
65°/ 50° 18°/ 10°
90%
Monday
Rain Showers
68°/ 50° 20°/ 10°
40%
Tuesday
Rain Showers
75°/ 52° 24°/ 11°
40%
Wednesday
Rain Showers
80°/ 52° 27°/ 11°
20%
Thursday
Sunny
82°28°
0%

Day: Cloudy. Patchy fog. Near steady temperature in the lower 60s. Northwest winds around 5 mph.

Night: Mostly cloudy with a slight chance of thunderstorms. A slight chance of showers in the evening, then a chance of showers after midnight. Lows in the mid 50s. Northeast winds 10 to 15 mph. Gusts up to 25 mph in the evening. Chance of rain 50 percent.

Lusk, WY

Today
Sunny
82°/ 52° 28°/ 11°
70%
Saturday
Thunderstorms
72°/ 50° 22°/ 10°
70%
Sunday
Thunderstorms
65°/ 45° 18°/
90%
Mon-Mon Night
Cloudy
65°18°
0%
Tuesday
Mostly Cloudy
75°/ 48° 24°/
40%
Wednesday
Partly Cloudy
78°/ 48° 26°/
0%

Day: Areas of dense fog this morning. Mostly sunny. Warmer with highs in the lower 80s. West winds 5 to 10 mph, becoming north 10 to 15 mph with gusts up to 25 mph this afternoon.

Night: Mostly cloudy. Numerous showers and scattered thunderstorms in the evening, then a chance of showers with a slight chance of thunderstorms after midnight. Patchy fog after midnight. Some thunderstorms may produce gusty winds and heavy rainfall. Lows in the lower 50s. Southeast winds 10 to 15 mph with gusts up to 25 mph. Chance of rain 70 percent.

Rapid City, SD

This Morning
Thunderstorms
58°/ 55° 14°/ 13°
60%
Today
Cloudy
75°24°
0%
Saturday
Thunderstorms
65°/ 52° 18°/ 11°
80%
Sunday
Thunderstorms
60°/ 50° 16°/ 10°
N/A
Monday
Rain Showers
62°/ 50° 17°/ 10°
50%
Tuesday
Rain Showers
72°/ 52° 22°/ 11°
30%
Wednesday
Thunderstorms
78°/ 52° 26°/ 11°
30%
Thursday
Sunny
78°26°
0%

Day: Cloudy with a slight chance of showers and thunderstorms. Patchy fog. Near steady temperature in the upper 50s. Northwest winds around 5 mph. Chance of rain 20 percent.

Night: Partly cloudy with a chance of showers in the evening, then cloudy with showers likely with a slight chance of thunderstorms after midnight. Lows in the mid 50s. Southeast winds 5 to 10 mph. Chance of rain 60 percent.

Sturgis, SD

This Morning
Thunderstorms
58°/ 55° 14°/ 13°
60%
Today
Cloudy
75°24°
0%
Saturday
Thunderstorms
65°/ 52° 18°/ 11°
80%
Sunday
Thunderstorms
60°/ 50° 16°/ 10°
N/A
Monday
Rain Showers
65°/ 52° 18°/ 11°
50%
Tuesday
Cloudy
72°/ 52° 22°/ 11°
20%
Wednesday
Thunderstorms
78°/ 52° 26°/ 11°
30%
Thursday
Sunny
78°26°
0%

Day: Cloudy with a slight chance of showers and thunderstorms. Patchy fog. Near steady temperature in the upper 50s. East winds around 5 mph. Chance of rain 20 percent.

Night: Partly cloudy with a slight chance of showers in the evening, then cloudy with showers likely after midnight. Lows in the mid 50s. Southeast winds 5 to 10 mph. Chance of rain 60 percent.

Kyle, SD

This Morning
Thunderstorms
62°/ 55° 17°/ 13°
40%
Today
Mostly Cloudy
75°24°
0%
Saturday
Rain Showers
68°/ 52° 20°/ 11°
60%
Sunday
Thunderstorms
65°/ 48° 18°/
90%
Monday
Rain Showers
68°/ 48° 20°/
40%
Tuesday
Rain Showers
75°/ 52° 24°/ 11°
40%
Wednesday
Rain Showers
78°/ 52° 26°/ 11°
20%
Thursday
Sunny
82°28°
0%

Day: Cloudy with a slight chance of showers and thunderstorms. Patchy fog. Near steady temperature in the lower 60s. Northwest winds 5 to 10 mph. Chance of rain 20 percent.

Night: Partly cloudy in the evening, then cloudy with a chance of showers after midnight. Lows in the mid 50s. Northeast winds 5 to 10 mph. Gusts up to 20 mph in the evening. Chance of rain 40 percent.

Harrison, NE

Today
Partly Cloudy
82°/ 55° 28°/ 13°
50%
Saturday
Thunderstorms
72°/ 50° 22°/ 10°
70%
Sunday
Thunderstorms
68°/ 45° 20°/
100%
Mon-Mon Night
Cloudy
65°18°
0%
Tuesday
Mostly Cloudy
75°/ 50° 24°/ 10°
40%
Wednesday
Sunny
78°/ 50° 26°/ 10°
0%

Day: Areas of dense fog this morning. Partly sunny. Highs in the lower 80s. West winds around 5 mph, becoming north 10 to 15 mph this afternoon.

Night: Mostly cloudy. Scattered showers and thunderstorms in the evening, then a chance of showers with a slight chance of thunderstorms after midnight. Patchy fog after midnight. Some thunderstorms may produce gusty winds and heavy rainfall in the evening. Some thunderstorms may produce gusty winds and heavy rainfall after midnight. Lows in the mid 50s. East winds 10 to 15 mph. Chance of rain 50 percent.

Box Elder, SD

This Morning
Thunderstorms
62°/ 55° 17°/ 13°
50%
Today
Cloudy
75°24°
0%
Saturday
Rain Showers
68°/ 52° 20°/ 11°
70%
Sunday
Thunderstorms
62°/ 50° 17°/ 10°
N/A
Monday
Rain Showers
65°/ 48° 18°/
50%
Tuesday
Rain Showers
72°/ 52° 22°/ 11°
20%
Wednesday
Thunderstorms
78°/ 52° 26°/ 11°
20%
Thursday
Sunny
80°27°
0%

Day: Cloudy with a chance of showers and a slight chance of thunderstorms. Patchy fog. Near steady temperature in the lower 60s. Northeast winds 5 to 10 mph. Chance of rain 50 percent.

Night: Partly cloudy in the evening, then cloudy with a chance of showers after midnight. Lows in the mid 50s. East winds 5 to 10 mph. Gusts up to 20 mph in the evening. Chance of rain 50 percent.

Folsom, SD

This Morning
Thunderstorms
58°/ 55° 14°/ 13°
50%
Today
Mostly Cloudy
78°26°
0%
Saturday
Rain Showers
68°/ 52° 20°/ 11°
60%
Sunday
Thunderstorms
65°/ 48° 18°/
N/A
Monday
Rain Showers
65°/ 48° 18°/
50%
Tuesday
Rain Showers
75°/ 52° 24°/ 11°
40%
Wednesday
Thunderstorms
80°/ 52° 27°/ 11°
20%
Thursday
Sunny
82°28°
0%

Day: Cloudy with a slight chance of showers and thunderstorms. Patchy fog. Lows in the upper 50s. North winds around 5 mph. Chance of rain 20 percent.

Night: Partly cloudy with a slight chance of showers in the evening, then cloudy with a chance of showers with a slight chance of thunderstorms after midnight. Lows in the mid 50s. East winds 5 to 10 mph. Gusts up to 20 mph in the evening. Chance of rain 50 percent.

Chadron, NE

Today
Mostly Cloudy
82°/ 55° 28°/ 13°
50%
Saturday
Rain Showers
72°/ 55° 22°/ 13°
70%
Sunday
Thunderstorms
68°/ 48° 20°/
100%
Monday
Rain Showers
65°/ 50° 18°/ 10°
40%
Tuesday
Partly Cloudy
75°/ 52° 24°/ 11°
40%
Wednesday
Sunny
78°/ 52° 26°/ 11°
0%

Day: Mostly cloudy this morning, then becoming partly sunny. Areas of dense fog this morning. Highs in the lower 80s. Northwest winds 5 to 10 mph, becoming north with gusts up to 20 mph this afternoon.

Night: Mostly cloudy with scattered showers with a slight chance of thunderstorms. Patchy fog after midnight. Some thunderstorms may produce gusty winds and heavy rainfall. Lows in the mid 50s. Northeast winds 5 to 10 mph. Chance of rain 50 percent.

Bill, WY

Today
Thunderstorms
82°/ 52° 28°/ 11°
70%
Saturday
Thunderstorms
75°/ 48° 24°/
70%
Sunday
Thunderstorms
65°/ 45° 18°/
90%
Monday
Sunny
68°/ 45° 20°/
0%
Tuesday
Cloudy
78°26°
0%
Wednesday
Cloudy
78°/ 48° 26°/
0%

Day: Mostly sunny. Areas of dense fog this morning. Isolated showers and thunderstorms this afternoon. Some thunderstorms may produce gusty winds and heavy rainfall this afternoon. Warmer with highs in the lower 80s. West winds 10 to 15 mph with gusts up to 25 mph. Chance of rain 20 percent.

Night: Mostly cloudy. Numerous showers and scattered thunderstorms in the evening, then a chance of showers after midnight. Some thunderstorms may produce gusty winds and heavy rainfall in the evening. Lows in the lower 50s. Southeast winds 5 to 10 mph, becoming south after midnight. Chance of rain 70 percent.

Pine Ridge, SD

This Morning
Thunderstorms
62°/ 55° 17°/ 13°
50%
Today
Cloudy
75°24°
0%
Saturday
Rain Showers
70°/ 52° 21°/ 11°
70%
Sunday
Thunderstorms
65°/ 48° 18°/
90%
Monday
Rain Showers
68°/ 48° 20°/
40%
Tuesday
Rain Showers
75°/ 52° 24°/ 11°
40%
Wednesday
Cloudy
78°/ 52° 26°/ 11°
0%
Thursday
Sunny
82°28°
0%

Day: Cloudy with a slight chance of showers and thunderstorms. Near steady temperature in the lower 60s. West winds 5 to 10 mph. Chance of rain 20 percent.

Night: Partly cloudy in the evening, then cloudy with a chance of showers with a slight chance of thunderstorms after midnight. Lows in the mid 50s. Northeast winds 5 to 10 mph. Gusts up to 20 mph in the evening. Chance of rain 50 percent.

Names listed above may include county names.

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