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Union County SD Weather - Clear - 86°F
Clear
86°F
Updated 1:23 pm
Feels Like 72°F
Humidity 33%
Wind SSE 13 mph
Barometer  29.71 in
Dew Point 53°F
Union County SD Weather - Clear - 30°C
Clear
30°C
Updated 1:23 pm
Feels Like 22°C
Humidity 33%
Wind SSE 21 km/h
Barometer  100.6 kPa
Dew Point 12°C
Union County, SD Weather and Current Conditionsunion county sd weather forecast

Union County, SD Weather Forecast

Union County South Dakota WeatherUnion County, South Dakota Weather Weather Forecast
14 Day API Union County, SD Weather Forecast. Note: Our 7 day Union County, South Dakota weather forecast is our most reliable, and specific forecast. This model should only be used as a probable scenario. Forecasting more than 7 days ahead is challenging.
Union County, SD Weather Forecast Dated: 123 PM Sun Oct 11 2026
Expect a cool pattern with plenty of sunshine and mostly dry weather over the coming period. moderate humidity and no major pressure swings will dominate.

Sunday, October 11, 2026

Mid-Morning
Union County Weather - 2026-10-11 - Morning - Cloudy
67°F 19°C
Cloudy
Mid-Afternoon
Union County Weather - 2026-10-11 - Afternoon - Overcast
83°F 29°C
Overcast
Early-Evening
Union County Weather - 2026-10-11 - Evening - Overcast
75°F 24°C
Overcast
Warm and summery near 83°F 29°C, cloudy in the morning, overcast in the afternoon, and cloudy this evening, with steady humidity and steady pressure. Winds out of the S at 15 mph 25 km/h. Gusts up to 21 mph 34 km/h.

Monday, October 12, 2026

Mid-Morning
Union County Weather - 2026-10-12 - Morning - Sunny
69°F 21°C
Sunny
Mid-Afternoon
Union County Weather - 2026-10-12 - Afternoon - Sunny
87°F 30°C
Sunny
Early-Evening
Union County Weather - 2026-10-12 - Evening - Sunny
71°F 22°C
Sunny
Balmy with temperatures reaching 87°F 30°C, sunny throughout the day, with steady humidity and steady pressure. Winds switching from the SSE to the NW at 14 mph 21 km/h. Gusts up to 24 mph 38 km/h.

Tuesday, October 13, 2026

Mid-Morning
Union County Weather - 2026-10-13 - Morning - Sunny
55°F 13°C
Sunny
Mid-Afternoon
Union County Weather - 2026-10-13 - Afternoon - Sunny
69°F 20°C
Sunny
Early-Evening
Union County Weather - 2026-10-13 - Evening - Overcast
65°F 19°C
Overcast
Enjoyable around 69°F 20°C, sunny in the morning, partly cloudy in the afternoon, and overcast this evening, with lower humidity and steady pressure. Winds moving from the NNE to the N at 11 mph 17 km/h.

Wednesday, October 14, 2026

Mid-Morning
Union County Weather - 2026-10-14 - Morning - Sunny
50°F 10°C
Sunny
Mid-Afternoon
Union County Weather - 2026-10-14 - Afternoon - Sunny
64°F 18°C
Sunny
Early-Evening
Union County Weather - 2026-10-14 - Evening - Sunny
58°F 14°C
Sunny
Cool with a high near 64°F 18°C, sunny throughout the day, with lower humidity and steady pressure. Winds swinging from the NNE to the ENE at 8 mph 13 km/h.

Thursday, October 15, 2026

Mid-Morning
Union County Weather - 2026-10-15 - Morning - Overcast
54°F 12°C
Overcast
Mid-Afternoon
Union County Weather - 2026-10-15 - Afternoon - Cloudy
58°F 15°C
Cloudy
Early-Evening
Union County Weather - 2026-10-15 - Evening - Overcast
54°F 12°C
Overcast
Refreshing around 58°F 15°C, overcast in the morning, cloudy in the afternoon, and partly cloudy this evening, with steady humidity and steady pressure. Winds shifting from the NE to the NW at 8 mph 13 km/h.

Friday, October 16, 2026

Mid-Morning
Union County Weather - 2026-10-16 - Morning - Sunny
44°F 6°C
Sunny
Mid-Afternoon
Union County Weather - 2026-10-16 - Afternoon - Sunny
51°F 10°C
Sunny
Early-Evening
Union County Weather - 2026-10-16 - Evening - Sunny
44°F 7°C
Sunny
Cool and brisk at 51°F 10°C, sunny throughout the day, with lower humidity and barometric pressure rising. Winds decreasing from NNW 23 mph 37 km/h to NNW 12 mph 18 km/h. Gusts up to 20 mph 32 km/h.

Saturday, October 17, 2026

Mid-Morning
Union County Weather - 2026-10-17 - Morning - Sunny
38°F 3°C
Sunny
Mid-Afternoon
Union County Weather - 2026-10-17 - Afternoon - Overcast
54°F 12°C
Overcast
Early-Evening
Union County Weather - 2026-10-17 - Evening - Sunny
49°F 10°C
Sunny
Chilly near 54°F 12°C, cloudy in the morning, partly cloudy in the afternoon, and sunny this evening, with steady humidity and barometric pressure falling. Winds picking up from S at 7 mph 12 km/h to S at 16 mph 25 km/h. Gusts up to 30 mph 49 km/h.

Sunday, October 18, 2026

Mid-Morning
Union County Weather - 2026-10-18 - Morning - Sunny
48°F 9°C
Sunny
Mid-Afternoon
Union County Weather - 2026-10-18 - Afternoon - Cloudy
65°F 18°C
Cloudy
Early-Evening
Union County Weather - 2026-10-18 - Evening - Overcast
58°F 14°C
Overcast
Cool with a high near 65°F 18°C, cloudy in the morning, overcast in the afternoon, and cloudy this evening, with steady humidity and steady pressure. Winds tapering down from S 20 mph 32 km/h to S 11 mph 17 km/h. Gusts up to 22 mph 34 km/h.

Monday, October 19, 2026

Mid-Morning
Union County Weather - 2026-10-19 - Morning - Sunny
53°F 12°C
Sunny
Mid-Afternoon
Union County Weather - 2026-10-19 - Afternoon - Cloudy
69°F 21°C
Cloudy
Early-Evening
Union County Weather - 2026-10-19 - Evening - Sunny
59°F 15°C
Sunny
Mild temperatures up to 69°F 21°C, partly cloudy throughout the day, with steady humidity and steady pressure. Winds swinging from the ESE to the SE at 11 mph 17 km/h. Gusts up to 23 mph 37 km/h.

Tuesday, October 20, 2026

Mid-Morning
Union County Weather - 2026-10-20 - Morning - Sunny
53°F 12°C
Sunny
Mid-Afternoon
Union County Weather - 2026-10-20 - Afternoon - Sunny
69°F 21°C
Sunny
Early-Evening
Union County Weather - 2026-10-20 - Evening - Sunny
67°F 20°C
Sunny
Mild with a high of 69°F 21°C, sunny through the afternoon, turning partly cloudy this evening, with steady humidity and barometric pressure falling. Winds shifting from the SSE to the S at 18 mph 28 km/h. Gusts up to 32 mph 52 km/h.

Wednesday, October 21, 2026

Mid-Morning
Union County Weather - 2026-10-21 - Morning - Sunny
62°F 16°C
Sunny
Mid-Afternoon
Union County Weather - 2026-10-21 - Afternoon - Sunny
72°F 22°C
Sunny
Early-Evening
Union County Weather - 2026-10-21 - Evening - Sunny
63°F 17°C
Sunny
Pleasant near 72°F 22°C, sunny throughout the day, with lower humidity and steady pressure. Winds turning from the SW to the NNW at 5 mph 8 km/h.

Thursday, October 22, 2026

Mid-Morning
Union County Weather - 2026-10-22 - Morning - Sunny
58°F 15°C
Sunny
Mid-Afternoon
Union County Weather - 2026-10-22 - Afternoon - Overcast
74°F 23°C
Overcast
Early-Evening
Union County Weather - 2026-10-22 - Evening - Overcast
63°F 18°C
Overcast
Comfortable with temperatures reaching 74°F 23°C, cloudy in the morning, becoming overcast through the afternoon and evening, with increasing humidity and steady pressure. Winds switching from the ESE to the SE at 8 mph 13 km/h.

Friday, October 23, 2026

Mid-Morning
Union County Weather - 2026-10-23 - Morning - Overcast
62°F 17°C
Overcast
Mid-Afternoon
Union County Weather - 2026-10-23 - Afternoon - Overcast
69°F 20°C
Overcast
Early-Evening
Union County Weather - 2026-10-23 - Evening - Sunny
62°F 17°C
Sunny
Enjoyable around 69°F 20°C, overcast in the morning, partly cloudy in the afternoon, and sunny this evening, with lower humidity and steady pressure.

Saturday, October 24, 2026

Mid-Morning
Union County Weather - 2026-10-24 - Morning - Sunny
57°F 14°C
Sunny
Mid-Afternoon
Union County Weather - 2026-10-24 - Afternoon - Sunny
71°F 22°C
Sunny
Early-Evening
Union County Weather - 2026-10-24 - Evening - Sunny
65°F 18°C
Sunny
Mild temperatures up to 71°F 22°C, sunny throughout the day, with steady humidity and barometric pressure falling. Winds out of the S at 12 mph 19 km/h.

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Weather by the Numbers

Sun, 11th
Union County SD Weather - Sunday, Oct 11, 2026 - Overcast
Hi: 83°F 29°C
Lo: 64°F 18°C
Sunrise 07:35 AM
Sunset 06:50 PM
Wind S 14 mph23 km/h
Dew Point 49°F9°C
uv Index 3
Barometric Pressure 29.71 in1006 mb
POP 10% *
Humidity 36%
Mon, 12th
Union County SD Weather - Monday, Oct 12, 2026 - Sunny
Hi: 87°F 30°C
Lo: 63°F 17°C
Sunrise 07:36 AM
Sunset 06:48 PM
Wind SSW 11 mph18 km/h
Dew Point 57°F14°C
uv Index 4
Barometric Pressure 29.59 in1002 mb
POP 1% *
Humidity 44%
Tue, 13th
Union County SD Weather - Tuesday, Oct 13, 2026 - Sunny
Hi: 69°F 21°C
Lo: 53°F 12°C
Sunrise 07:38 AM
Sunset 06:47 PM
Wind N 8 mph13 km/h
Dew Point 47°F8°C
uv Index 5
Barometric Pressure 29.91 in1013 mb
POP 3% *
Humidity 55%
Wed, 14th
Union County SD Weather - Wednesday, Oct 14, 2026 - Sunny
Hi: 64°F 18°C
Lo: 47°F 9°C
Sunrise 07:39 AM
Sunset 06:45 PM
Wind NNE 10 mph16 km/h
Dew Point 39°F4°C
uv Index 4
Barometric Pressure 30.18 in1022 mb
POP 2% *
Humidity 48%
Thu, 15th
Union County SD Weather - Thursday, Oct 15, 2026 - Overcast
Hi: 59°F 15°C
Lo: 49°F 10°C
Sunrise 07:40 AM
Sunset 06:43 PM
Wind N 7 mph11 km/h
Dew Point 42°F6°C
uv Index 3
Barometric Pressure 30.15 in1021 mb
POP 14% *
Humidity 57%
Fri, 16th
Union County SD Weather - Friday, Oct 16, 2026 - Sunny
Hi: 56°F 13°C
Lo: 37°F 3°C
Sunrise 07:41 AM
Sunset 06:42 PM
Wind NNW 24 mph38 km/h
Dew Point 21°F-6°C
uv Index 3
Barometric Pressure 30.56 in1035 mb
POP 1% *
Humidity 35%
Sat, 17th
Union County SD Weather - Saturday, Oct 17, 2026 - Overcast
Hi: 55°F 13°C
Lo: 32°F -0°C
Sunrise 07:42 AM
Sunset 06:40 PM
Wind S 11 mph18 km/h
Dew Point 18°F-8°C
uv Index 2
Barometric Pressure 30.56 in1035 mb
POP 9% *
Humidity 30%
Sun, 18th
Union County SD Weather - Sunday, Oct 18, 2026 - Overcast
Hi: 67°F 19°C
Lo: 44°F 7°C
Sunrise 07:44 AM
Sunset 06:39 PM
Wind SSW 20 mph32 km/h
Dew Point 26°F-3°C
uv Index 3
Barometric Pressure 30.06 in1018 mb
POP 7% *
Humidity 30%
Mon, 19th
Union County SD Weather - Monday, Oct 19, 2026 - Partly Cloudy
Hi: 70°F 21°C
Lo: 47°F 8°C
Sunrise 07:45 AM
Sunset 06:37 PM
Wind SE 9 mph15 km/h
Dew Point 36°F2°C
uv Index 5
Barometric Pressure 30.18 in1022 mb
POP 6% *
Humidity 37%
Tue, 20th
Union County SD Weather - Tuesday, Oct 20, 2026 - Sunny
Hi: 71°F 22°C
Lo: 49°F 9°C
Sunrise 07:46 AM
Sunset 06:35 PM
Wind S 18 mph29 km/h
Dew Point 40°F4°C
uv Index 5
Barometric Pressure 30 in1016 mb
POP 1% *
Humidity 44%
Wed, 21st
Union County SD Weather - Wednesday, Oct 21, 2026 - Sunny
Hi: 72°F 22°C
Lo: 57°F 14°C
Sunrise 07:47 AM
Sunset 06:34 PM
Wind WSW 9 mph14 km/h
Dew Point 45°F7°C
uv Index 5
Barometric Pressure 29.97 in1015 mb
POP 1% *
Humidity 46%
Thu, 22nd
Union County SD Weather - Thursday, Oct 22, 2026 - Overcast
Hi: 75°F 24°C
Lo: 52°F 11°C
Sunrise 07:48 AM
Sunset 06:32 PM
Wind SE 10 mph16 km/h
Dew Point 49°F10°C
uv Index 5
Barometric Pressure 30.12 in1020 mb
POP 11% *
Humidity 51%
Fri, 23rd
Union County SD Weather - Friday, Oct 23, 2026 - Overcast
Hi: 70°F 21°C
Lo: 57°F 14°C
Sunrise 07:50 AM
Sunset 06:31 PM
Wind N 7 mph12 km/h
Dew Point 56°F13°C
uv Index 4
Barometric Pressure 30.12 in1020 mb
POP 20% *
Humidity 74%
Sat, 24th
Union County SD Weather - Saturday, Oct 24, 2026 - Sunny
Hi: 73°F 23°C
Lo: 53°F 11°C
Sunrise 07:51 AM
Sunset 06:29 PM
Wind S 11 mph17 km/h
Dew Point 53°F11°C
uv Index 5
Barometric Pressure 30.09 in1019 mb
POP 4% *
Humidity 63%
* POP = Probability of Precipitation. Data for 12:00 PM.