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Union County, SD Weather Forecast
Union County, SD Weather Forecast Dated: 951 PM Fri Oct 09 2026
Expect a cool pattern with a mix of sun and clouds and occasional showers over the coming period. moderate humidity and no major pressure swings will dominate.
Friday, October 9, 2026
Mid-Morning
60°F 15°C
Sunny
Mid-Afternoon
78°F 26°C
Sunny
Early-Evening
72°F 23°C
Sunny
Pleasant near 78°F 26°C, sunny throughout the day, with lower humidity and barometric pressure falling. Winds turning from the E to the SSE at 9 mph 14 km/h. Gusts up to 21 mph 34 km/h.
Saturday, October 10, 2026
Mid-Morning
67°F 20°C
Sunny
Mid-Afternoon
85°F 30°C
Sunny
Early-Evening
78°F 25°C
Sunny
Balmy with temperatures reaching 85°F 30°C, sunny throughout the day, with steady humidity and steady pressure. Winds switching from the S to the SSE at 17 mph 28 km/h. Gusts up to 36 mph 57 km/h.
Sunday, October 11, 2026
Mid-Morning
66°F 19°C
Partly Cloudy
Mid-Afternoon
83°F 29°C
Overcast
Early-Evening
75°F 24°C
Overcast
Quite warm around 83°F 29°C, cloudy in the morning, becoming overcast through the afternoon and evening, with steady humidity and steady pressure. Winds moving from the SSE to the S at 9 mph 15 km/h. Gusts up to 21 mph 34 km/h.
Monday, October 12, 2026
Mid-Morning
59°F 15°C
Overcast
Mid-Afternoon
72°F 22°C
Sunny
Early-Evening
64°F 18°C
Partly Cloudy
Mild temperatures up to 72°F 22°C, overcast in the morning, sunny in the afternoon, and partly cloudy this evening, with steady humidity and steady pressure. Winds out of the NNW at 8 mph 13 km/h.
Tuesday, October 13, 2026
Mid-Morning
48°F 9°C
Sunny
Mid-Afternoon
63°F 17°C
Sunny
Early-Evening
57°F 14°C
Sunny
Refreshing around 63°F 17°C, sunny throughout the day, with lower humidity and steady pressure. Winds shifting from the N to the NE at 7 mph 11 km/h.
Wednesday, October 14, 2026
Mid-Morning
50°F 10°C
Sunny
Mid-Afternoon
67°F 19°C
Cloudy
Early-Evening
61°F 16°C
Scattered Showers
Mildly cool near 67°F 19°C, locally heavy downpours at times, with steady humidity and barometric pressure falling. Winds turning from the E to the ESE at 15 mph 24 km/h. Gusts up to 25 mph 41 km/h.
Thursday, October 15, 2026
Mid-Morning
60°F 16°C
Light Rain
Mid-Afternoon
69°F 20°C
Sunny
Early-Evening
61°F 16°C
Scattered Showers
Comfortable with temperatures reaching 69°F 20°C, periods of heavy rain and gusty conditions, with lower humidity and steady pressure. Winds picking up from SSW at 7 mph 11 km/h to WNW at 19 mph 30 km/h. Gusts up to 32 mph 51 km/h.
Friday, October 16, 2026
Mid-Morning
46°F 8°C
Overcast
Mid-Afternoon
46°F 8°C
Overcast
Early-Evening
42°F 5°C
Scattered Showers
Crisp with a high near 46°F 8°C, scattered downpours possible, with increasing humidity and barometric pressure rising. Winds moving from the WNW to the NW at 27 mph 43 km/h. Gusts up to 43 mph 68 km/h.
Saturday, October 17, 2026
Mid-Morning
35°F 1°C
Partly Cloudy
Mid-Afternoon
44°F 7°C
Sunny
Early-Evening
39°F 4°C
Sunny
Cold with a high near 44°F 7°C, partly cloudy in the morning, becoming sunny through the afternoon and evening, with lower humidity and barometric pressure falling. Winds swinging from the NNW to the SSE at 6 mph 11 km/h.
Sunday, October 18, 2026
Mid-Morning
42°F 5°C
Sunny
Mid-Afternoon
59°F 15°C
Cloudy
Early-Evening
52°F 12°C
Cloudy
Mildly cool near 59°F 15°C, sunny in the morning, becoming cloudy through the afternoon and evening, with steady humidity and barometric pressure falling. Winds easing from S 19 mph 31 km/h to SSE 8 mph 13 km/h.
Monday, October 19, 2026
Mid-Morning
48°F 9°C
Sunny
Mid-Afternoon
62°F 17°C
Overcast
Early-Evening
57°F 15°C
Overcast
Comfortable at 62°F 17°C, sunny in the morning, becoming overcast through the afternoon and evening, with lower humidity and barometric pressure falling. Winds turning from the ESE to the SE at 14 mph 22 km/h. Gusts up to 27 mph 43 km/h.
Tuesday, October 20, 2026
Mid-Morning
53°F 11°C
Scattered Showers
Mid-Afternoon
55°F 13°C
Overcast
Early-Evening
54°F 13°C
Scattered Showers
Crisp with a high near 55°F 13°C, locally heavy downpours at times, with steady humidity and barometric pressure falling. Winds switching from the S to the SSE at 13 mph 21 km/h. Gusts up to 30 mph 48 km/h.
Wednesday, October 21, 2026
Mid-Morning
53°F 12°C
Drizzle
Mid-Afternoon
60°F 15°C
Overcast
Early-Evening
56°F 13°C
Drizzle
Refreshing around 60°F 15°C, rounds of showers morning and night, dry in between, with steady humidity and steady pressure. Winds moving from the S to the WSW at 11 mph 17 km/h. Gusts up to 23 mph 37 km/h.
Thursday, October 22, 2026
Mid-Morning
49°F 10°C
Sunny
Mid-Afternoon
60°F 16°C
Sunny
Early-Evening
54°F 12°C
Sunny
Mildly cool near 60°F 16°C, sunny throughout the day, with lower humidity and steady pressure. Winds swinging from the NNW to the SE at 5 mph 8 km/h.
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