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

Severe Weather Across the Center of the Nation; Fire Weather Concerns for Southwest and California; Snow for the Central Rockies

Severe thunderstorms will continue to impact the center of the Nation through today. Very large hail, strong tornadoes, and damaging winds are expected from the Great Lakes into the central/southern Plains; Flash flooding is possible for portions into the mid-Mississippi Valley. Critical fire weather conditions for the Southwest and central valley of California today. Winter hangs on for Rockies. Read More >

Hazardous Weather Conditions

Current conditions at

Rapid City, Rapid City Regional Airport (KRAP)

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

Light Rain

41°F

5°C

Humidity 93%
Wind Speed N 18 mph
Barometer 30.04 in (1018.6 mb)
Dewpoint 39°F (4°C)
Visibility 10.00 mi
Wind Chill32°F (0°C)
Last update 18 May 4:52 pm MDT
Extended Forecast for

Hermosa SD

Freeze Warning May 19, 12:00am until May 19, 09:00am
Click here for hazard details and duration
Freeze Warning

  • This Afternoon

    This Afternoon: A 50 percent chance of showers. Cloudy, with a high near 43. North wind around 17 mph, with gusts as high as 33 mph.

    High: 43 °F

    Chance
    Showers

  • Tonight

    Tonight: A 40 percent chance of showers before 8pm. Widespread frost, mainly after 2am. Otherwise, cloudy, then gradually becoming partly cloudy, with a low around 29. Northwest wind 5 to 15 mph, with gusts as high as 31 mph.

    Low: 29 °F

    Chance
    Showers then
    Frost

  • Tuesday

    Tuesday: Widespread frost, mainly before 7am. Otherwise, mostly sunny, with a high near 59. Calm wind becoming east around 6 mph in the afternoon. Winds could gust as high as 17 mph.

    High: 59 °F

    Frost then
    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 34. Southeast wind around 6 mph becoming light and variable. Winds could gust as high as 17 mph.

    Low: 34 °F

    Mostly Clear

  • Wednesday

    Wednesday: A chance of showers, with thunderstorms also possible after 3pm. Mostly sunny, with a high near 66. Breezy, with a south wind 7 to 12 mph increasing to 15 to 20 mph in the morning. Winds could gust as high as 33 mph. Chance of precipitation is 30%.

    High: 66 °F

    Chance
    Showers and
    Breezy

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 40. South wind 13 to 18 mph decreasing to 7 to 12 mph after midnight. Winds could gust as high as 30 mph.

    Low: 40 °F

    Mostly Clear

  • Thursday

    Thursday: Showers likely and possibly a thunderstorm after noon. Partly sunny, with a high near 68. Chance of precipitation is 60%.

    High: 68 °F

    Mostly Sunny
    then Showers
    Likely

  • Thursday Night

    Thursday Night: Showers likely and possibly a thunderstorm before midnight, then a chance of showers. Mostly cloudy, with a low around 41.

    Low: 41 °F

    Showers
    Likely

  • Friday

    Friday: A chance of showers, with thunderstorms also possible after noon. Partly sunny, with a high near 64.

    High: 64 °F

    Chance
    Showers then
    Chance
    T-storms

Detailed Forecast

This Afternoon
A 50 percent chance of showers. Cloudy, with a high near 43. North wind around 17 mph, with gusts as high as 33 mph.
Tonight
A 40 percent chance of showers before 8pm. Widespread frost, mainly after 2am. Otherwise, cloudy, then gradually becoming partly cloudy, with a low around 29. Northwest wind 5 to 15 mph, with gusts as high as 31 mph.
Tuesday
Widespread frost, mainly before 7am. Otherwise, mostly sunny, with a high near 59. Calm wind becoming east around 6 mph in the afternoon. Winds could gust as high as 17 mph.
Tuesday Night
Mostly clear, with a low around 34. Southeast wind around 6 mph becoming light and variable. Winds could gust as high as 17 mph.
Wednesday
A chance of showers, with thunderstorms also possible after 3pm. Mostly sunny, with a high near 66. Breezy, with a south wind 7 to 12 mph increasing to 15 to 20 mph in the morning. Winds could gust as high as 33 mph. Chance of precipitation is 30%.
Wednesday Night
Mostly clear, with a low around 40. South wind 13 to 18 mph decreasing to 7 to 12 mph after midnight. Winds could gust as high as 30 mph.
Thursday
Showers likely and possibly a thunderstorm after noon. Partly sunny, with a high near 68. Chance of precipitation is 60%.
Thursday Night
Showers likely and possibly a thunderstorm before midnight, then a chance of showers. Mostly cloudy, with a low around 41.
Friday
A chance of showers, with thunderstorms also possible after noon. Partly sunny, with a high near 64.
Friday Night
A slight chance of showers before midnight. Partly cloudy, with a low around 41.
Saturday
A slight chance of showers and thunderstorms. Mostly sunny, with a high near 74.
Saturday Night
Mostly clear, with a low around 46.
Sunday
Sunny, with a high near 85.
Sunday Night
Mostly clear, with a low around 50.
Memorial Day
Sunny, with a high near 89.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Hermosa SD
 43.84°N 103.19°W (Elev. 3383 ft)
Last Update:
5:09 pm MDT May 18, 2026
Forecast Valid:
5pm MDT May 18, 2026-6pm MDT May 25, 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