Jefferson, South Dakota Weather
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Weather Forecast for Jefferson, South Dakota : Union County
Issued: 11:46 pm CDT Jun 2, 2025 Latitude: 42.6024951 Longitude: -96.5591992 View on Google Maps

MouseOver for Detail Forecast
Overnight Tuesday Wednesday Thursday Friday Saturday Sunday Monday
90% chance of thunderstorms on Overnight 80% chance of thunderstorms on Tuesday Mostly Sunny on Wednesday 50% chance of on Thursday 30% chance of on Friday 40% chance of rain on Saturday Mostly Sunny on Sunday Sunny on Monday
Low: 55°F High: 68°F High: 76°F High: 74°F High: 75°F High: 78°F High: 81°F High: 79°F
Low: 48°F Low: 53°F Low: 54°F Low: 53°F Low: 58°F Low: 54°F  
Thunderstorms Thunderstorms Mostly Sunny Partly Sunny Partly Sunny Rain Mostly Sunny Sunny
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Current Conditions at
SIOUX CITY - (KSUX)
68°
Cloudy
Thunderstorm In Vicinity Light Rain Mist
as of 12:39 AM CDST
Rel. Humidity: 93%
Dew Point: 66°F
Visibility: 3 Miles
Pressure: 29.77 in.
Flight Rule: MVFR
Wind Data
13 MPH
290° West
Cloud Level(s): Scattered at 3400ft, Broken at 6000ft, Solid Overcast at 8500ft
Current Conditions at
LE MARS - (KLRJ)
68°
Mostly Cloudy
as of 12:35 AM CDST
Rel. Humidity: 100%
Dew Point: 68°F
Visibility: 10 Miles
Pressure: 29.77 in.
Flight Rule: VFR
Wind Data
Calm
Cloud Level(s): Few at 3400ft, Scattered at 5500ft, Broken at 12000ft
Current Conditions at
WAYNE - (KLCG)
63°
Cloudy
Light Thunderstorm Rain
as of 12:35 AM CDST
Rel. Humidity: 88%
Dew Point: 59°F
Visibility: 5 Miles
Pressure: 29.80 in.
Flight Rule: MVFR
Wind Data
20 MPH
Gust: 24 MPH
350° North
Cloud Level(s): Scattered at 2700ft, Broken at 5000ft, Solid Overcast at 6000ft
90% chance of thunderstorms Overnight Overnight... Showers and possibly a thunderstorm. Some of the storms could produce heavy rainfall. Patchy smoke after 2am. Low around 55. North wind around 15 mph, with gusts as high as 20 mph. Chance of precipitation is 90%. New rainfall amounts between three quarters and one inch possible.
80% chance of thunderstorms Tuesday Tuesday... Showers and possibly a thunderstorm before 1pm, then a chance of showers between 1pm and 4pm. Patchy smoke before 10am. High near 68. Breezy, with a north wind 15 to 20 mph, with gusts as high as 25 mph. Chance of precipitation is 80%. New precipitation amounts between a quarter and half of an inch possible.
Mostly Clear on Tuesday Night Tuesday Night... Mostly cloudy, then gradually becoming mostly clear, with a low around 48. North wind 5 to 10 mph becoming west after midnight.
Mostly Sunny on Wednesday Wednesday... Mostly sunny, with a high near 76. North northwest wind around 5 mph becoming south southeast in the afternoon.
Mostly Cloudy on Wednesday Night Wednesday Night... Mostly cloudy, with a low around 53. East southeast wind around 5 mph becoming calm in the evening.
50% chance of Thursday Thursday... A 50 percent chance of showers, mainly after 1pm. Partly sunny, with a high near 74. Calm wind becoming south southeast around 5 mph in the morning.
40% chance of rain Thursday Night Thursday Night... A 40 percent chance of showers. Mostly cloudy, with a low around 54.
30% chance of Friday Friday... A 30 percent chance of showers after 1pm. Partly sunny, with a high near 75.
Mostly Cloudy on Friday Night Friday Night... Mostly cloudy, with a low around 53.
40% chance of rain Saturday Saturday... A 40 percent chance of showers after 1pm. Mostly cloudy, with a high near 78.
40% chance of thunderstorms Saturday Night Saturday Night... A 40 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 58.
Mostly Sunny on Sunday Sunday... Mostly sunny, with a high near 81.
Mostly Clear on Sunday Night Sunday Night... Mostly clear, with a low around 54.
Sunny on Monday Monday... Sunny, with a high near 79.
Sun Almanac for Jefferson, South Dakota
Sunrise: 05:50 AM
Sunset: 8:59 PM
Civil Sunrise:05:16 AM
Civil Sunset: 9:33 PM
Nautical Sunrise: 04:32 AM
Nautical Sunset: 10:17 PM
Astro Sunrise: 03:39 AM
Astro Sunset: 11:10 PM
Any use of the information on this page is at your own risk. This information should not be relied upon in life-threatening situations, potential financial loss situations or in lieu of any officially disseminated information. Visit the National Weather Service for official information.