National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Heavy Rainfall on the Western Gulf Coast; Severe Thunderstorms in the Southern Plains Friday

A multi-day heavy rainfall event will continue over the western Gulf Coast through Monday. Slight Risks of excessive rainfall have been issued, and Flood Watches remain in effect through Monday evening. Scattered severe storms capable of producing large hail and damaging winds are possible across western portions of Texas and Oklahoma on Friday. Read More >

Current conditions at

Rapid City, Rapid City Regional Airport (KRAP)

Lat: 44.05°NLon: 103.05°WElev: 3202ft.

Overcast

50°F

10°C

Humidity 89%
Wind Speed N 14 mph
Barometer 29.93 in (1013.3 mb)
Dewpoint 47°F (8°C)
Visibility 10.00 mi
Wind Chill45°F (7°C)
Last update 21 May 8:52 pm MDT
Extended Forecast for

Rapid City SD

  • Tonight

    Tonight: Showers likely before midnight, then rain, mainly after midnight. Low around 43. Northwest wind 8 to 18 mph, with gusts as high as 36 mph. Chance of precipitation is 90%.

    Low: 43 °F

    Rain

  • Friday

    Friday: Rain likely, mainly before 9am. Cloudy through mid morning, then gradual clearing, with a high near 63. Breezy, with a northwest wind 17 to 26 mph, with gusts as high as 43 mph. Chance of precipitation is 70%.

    High: 63 °F

    Breezy. Rain
    Likely then
    Mostly Sunny

  • Friday Night

    Friday Night: Partly cloudy, with a low around 41. North wind 10 to 15 mph becoming light and variable. Winds could gust as high as 31 mph.

    Low: 41 °F

    Partly Cloudy

  • Saturday

    Saturday: A slight chance of showers between noon and 3pm, then a slight chance of showers and thunderstorms after 3pm. Mostly sunny, with a high near 73. Calm wind becoming southeast 5 to 7 mph in the afternoon. Winds could gust as high as 16 mph. Chance of precipitation is 20%.

    High: 73 °F

    Mostly Sunny
    then Slight
    Chance
    T-storms

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 46. East wind around 5 mph becoming light and variable.

    Low: 46 °F

    Mostly Clear

  • Sunday

    Sunday: Sunny, with a high near 86. Calm wind becoming southeast 5 to 8 mph in the afternoon. Winds could gust as high as 20 mph.

    High: 86 °F

    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 53.

    Low: 53 °F

    Mostly Clear

  • Memorial Day

    Memorial Day: Sunny, with a high near 91.

    High: 91 °F

    Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 59.

    Low: 59 °F

    Partly Cloudy

Detailed Forecast

Tonight
Showers likely before midnight, then rain, mainly after midnight. Low around 43. Northwest wind 8 to 18 mph, with gusts as high as 36 mph. Chance of precipitation is 90%.
Friday
Rain likely, mainly before 9am. Cloudy through mid morning, then gradual clearing, with a high near 63. Breezy, with a northwest wind 17 to 26 mph, with gusts as high as 43 mph. Chance of precipitation is 70%.
Friday Night
Partly cloudy, with a low around 41. North wind 10 to 15 mph becoming light and variable. Winds could gust as high as 31 mph.
Saturday
A slight chance of showers between noon and 3pm, then a slight chance of showers and thunderstorms after 3pm. Mostly sunny, with a high near 73. Calm wind becoming southeast 5 to 7 mph in the afternoon. Winds could gust as high as 16 mph. Chance of precipitation is 20%.
Saturday Night
Mostly clear, with a low around 46. East wind around 5 mph becoming light and variable.
Sunday
Sunny, with a high near 86. Calm wind becoming southeast 5 to 8 mph in the afternoon. Winds could gust as high as 20 mph.
Sunday Night
Mostly clear, with a low around 53.
Memorial Day
Sunny, with a high near 91.
Monday Night
Partly cloudy, with a low around 59.
Tuesday
A slight chance of showers and thunderstorms after noon. Sunny, with a high near 88. Breezy.
Tuesday Night
A chance of showers and thunderstorms. Partly cloudy, with a low around 57. Breezy.
Wednesday
Showers likely and possibly a thunderstorm. Partly sunny, with a high near 79. Breezy.
Wednesday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 53.
Thursday
A chance of showers and thunderstorms. Mostly sunny, with a high near 78.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Rapid City SD
 44.08°N 103.21°W (Elev. 3189 ft)
Last Update:
8:01 pm MDT May 21, 2026
Forecast Valid:
9pm MDT May 21, 2026-6pm MDT May 28, 2026
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

Link to Local Radar Data Link to Satellite Data

Hourly Weather Forecast

National Digital Forecast Database

National Digital Forecast Database Maximum Temperature Forecast

High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation