KEYSTONE, SD 57751 Weather Forecast & Current Conditions
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  57751 WEATHER WARNINGS (SEVERE T-STORM & TORNADO)
 CURRENT WEATHER

RAPID CITY, SD
Current Weather
4:52 AM MDT MAY 18, 2026
Overcast
45°F
Feels Like: 37°F
Dewpoint: 36°F
Rel. Hum.: 71%
Visibility: 10 miles
Wind: NNW at 21 mph, gusts to 28
Pressure:
Last 72 hours

Local Area Snow Depth

South Dakota Current Weather

South Dakota MOS Forecast Weather


Weather Map

(Automated weather data from NWS/FAA)
  57751 WEATHER FORECAST
10-Day model forecast maps
2025 Hurricanes

KEYSTONE, SD 57751
Weather Forecast

 Snowfall Forecast pages
Snow Depth pages
EARLY THIS MORNING
Rain showers and snow showers likely. Lows in the lower to mid 30s. North winds 5 to 10 mph with gusts up to 30 mph. Chance of precipitation 60 percent.
TODAY
Snow showers and rain showers. Snow accumulation up to 1 inch. Highs in the mid 30s. North winds 10 to 15 mph with gusts up to 30 mph.
TONIGHT
Mostly cloudy with a slight chance of snow showers in the evening, then partly cloudy after midnight. Lows in the mid 20s. Northwest winds 5 to 10 mph with gusts up to 25 mph. Chance of snow 20 percent.
TUESDAY
Mostly sunny in the morning, then becoming partly cloudy. Highs in the lower 50s. Northwest winds 5 to 10 mph with gusts up to 20 mph.
TUESDAY NIGHT
Mostly clear. Lows in the lower 30s. South winds 5 to 10 mph.
WEDNESDAY
Mostly sunny in the morning, then becoming partly cloudy. Highs around 60. Southwest winds 5 to 10 mph with gusts up to 25 mph.
WEDNESDAY NIGHT
Partly cloudy. Lows in the upper 30s.
THURSDAY
Partly cloudy. A slight chance of rain showers in the morning, then rain showers likely with a chance of thunderstorms in the afternoon. Highs in the upper 50s. Chance of rain 70 percent.
THURSDAY NIGHT
Partly cloudy. A chance of rain showers with a slight chance of thunderstorms in the evening, then a slight chance of rain showers after midnight. Lows in the mid 30s. Chance of rain 50 percent.
FRIDAY
Partly cloudy. A slight chance of rain showers in the morning, then a chance of rain showers with a slight chance of thunderstorms in the afternoon. Highs around 60. Chance of rain 40 percent.
FRIDAY NIGHT
Partly cloudy. A slight chance of rain showers and thunderstorms in the evening. Lows around 40. Chance of rain 20 percent.
SATURDAY
Partly cloudy. Highs in the upper 60s.
SATURDAY NIGHT
Partly cloudy in the evening, then clearing. Lows in the mid 40s.

  57751 WEATHER SATELLITE LOOPS
Visible Weather Satellite
KEYSTONE, SD 57751
Infrared Weather Satellite
KEYSTONE, SD 57751
  57751 WEATHER RADAR LOOP
NEXRAD Weather Radar
KEYSTONE, SD 57751
 MOS COMPUTER WEATHER FORECAST

RAPID CITY, SD 3 hourly weather forecast
weather forecast created  5:00 PM PDT  5/17/2026
Monday
18 MAY 2026		 KEYSTONE, SD 57751 weather forecast Day 1, 0 hours 12 AM 46° 39° Mostly Cloudy 42%
RAIN
.5–1 in		 0% Thunder
( 5% severe)		 NNW   15 58% 32°
Low 39° KEYSTONE, SD 57751 weather forecast Day 1, 3 hours 3 AM 43° 35° Mostly Cloudy NNW   16 68% 33°
High 45° KEYSTONE, SD 57751 weather forecast Day 1, 6 hours 6 AM 40° 31° Overcast 67%
RAIN
>2 in		 0% Thunder
( 7% severe)		 NNW   20 85% 36°

Mostly Cloudy

Rain Likely


Windy		 KEYSTONE, SD 57751 weather forecast Day 1, 9 hours 9 AM 41° 31° Mostly Cloudy N   24 82% 36°
KEYSTONE, SD 57751 weather forecast Day 1, 12 hours 12 PM 41° 31° Mostly Cloudy 72%
RAIN
***		 0% Thunder
( 12% severe)		 N   22 76% 34°
KEYSTONE, SD 57751 weather forecast Day 1, 15 hours 3 PM 41° 32° Mostly Cloudy N   21 79% 35°
KEYSTONE, SD 57751 weather forecast Day 1, 18 hours 6 PM 42° 33° Mostly Cloudy 26%
RAIN
.01–.1 in		 0% Thunder
( 3% severe)		 NNW   20 70% 33°
KEYSTONE, SD 57751 weather forecast Day 1, 21 hours 9 PM 39° 30° Mostly Cloudy NNW   16 79% 33°
Tuesday
19 MAY 2026		 KEYSTONE, SD 57751 weather forecast Day 2, 0 hours 12 AM 37° 30° Mostly Cloudy 3%

 0% Thunder
( 0% severe)		 NW   9 82% 32°
Low 31° KEYSTONE, SD 57751 weather forecast Day 2, 3 hours 3 AM 35° 29° Partly Cloudy NW   7 82% 30°
High 59° KEYSTONE, SD 57751 weather forecast Day 2, 6 hours 6 AM 34° 29° Partly Cloudy 5%

 0% Thunder
( 0% severe)		 NW   6 89% 31°

Partly Cloudy



 KEYSTONE, SD 57751 weather forecast Day 2, 9 hours 9 AM 45° 40° Partly Cloudy NNW   9 55% 30°
KEYSTONE, SD 57751 weather forecast Day 2, 12 hours 12 PM 51° 48° Partly Cloudy 4%

 0% Thunder
( 4% severe)		 NNW   8 39% 27°
KEYSTONE, SD 57751 weather forecast Day 2, 15 hours 3 PM 56° 55° Partly Cloudy N   6 31% 26°
KEYSTONE, SD 57751 weather forecast Day 2, 18 hours 6 PM 58° 57° Clear 1%

 0% Thunder
( 1% severe)		 ENE   7 28% 25°
KEYSTONE, SD 57751 weather forecast Day 2, 21 hours 9 PM 46° 43° Partly Cloudy SSE   6 49% 28°

RAPID CITY, SD extended weather forecast
Wednesday
20 MAY 2026		 Thursday
21 MAY 2026		 Friday
22 MAY 2026		 Saturday
23 MAY 2026		 Sunday
24 MAY 2026
Low 35° Low 41° Low 43° Low 41° Low 45°
High 71° High 68° High 62° High 77° High 81°
KEYSTONE, SD 57751 weather forecast Day 3 KEYSTONE, SD 57751 weather forecast Day 4 KEYSTONE, SD 57751 weather forecast Day 5 KEYSTONE, SD 57751 weather forecast Day 6 KEYSTONE, SD 57751 weather forecast Day 7
Partly Cloudy
7% Rain		 Mostly Cloudy
47% Rain		 Overcast
56% Rain		 Mostly Cloudy
26% Rain		 Clear
16% Rain
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