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Sinai, SD Weather Forecast


Sinai, SD Weather Forecast Dated: 837 AM Thu Oct 01 2026
Expect a cool pattern with a mix of sun and clouds and mostly dry weather over the coming period. moderate humidity and a stable pattern will dominate.
Thursday, October 1, 2026
Mid-Morning
51°F 11°C
Overcast
Mid-Afternoon
60°F 15°C
Overcast
Early-Evening
60°F 16°C
Partly Cloudy
Refreshing around 60°F 15°C, overcast through the afternoon, turning cloudy this evening, with lower humidity and steady pressure. Winds out of the N at 12 mph 19 km/h.
Friday, October 2, 2026
Mid-Morning
41°F 5°C
Drizzle
Mid-Afternoon
49°F 9°C
Scattered Showers
Early-Evening
52°F 11°C
Scattered Showers
Cool and brisk at 49°F 9°C, scattered downpours possible, with lower humidity and barometric pressure falling. Winds switching from the ENE to the SE at 11 mph 18 km/h. Gusts up to 23 mph 36 km/h.
Saturday, October 3, 2026
Mid-Morning
48°F 9°C
Sunny
Mid-Afternoon
65°F 18°C
Overcast
Early-Evening
63°F 17°C
Sunny
Comfortable at 65°F 18°C, sunny in the morning, overcast in the afternoon, and sunny this evening, with steady humidity and steady pressure. Winds moving from the SSW to the N at 9 mph 15 km/h. Gusts up to 21 mph 33 km/h.
Sunday, October 4, 2026
Mid-Morning
46°F 8°C
Overcast
Mid-Afternoon
57°F 14°C
Overcast
Early-Evening
54°F 13°C
Overcast
Crisp with a high near 57°F 14°C, overcast through the afternoon, turning cloudy this evening, with lower humidity and steady pressure.
Monday, October 5, 2026
Mid-Morning
45°F 7°C
Sunny
Mid-Afternoon
57°F 14°C
Sunny
Early-Evening
56°F 13°C
Sunny
Brisk around 57°F 14°C, sunny through the afternoon, turning cloudy this evening, with steady humidity and barometric pressure falling. Winds swinging from the ESE to the SSE at 16 mph 25 km/h. Gusts up to 31 mph 50 km/h.
Tuesday, October 6, 2026
Mid-Morning
51°F 10°C
Overcast
Mid-Afternoon
61°F 16°C
Overcast
Early-Evening
63°F 17°C
Overcast
Mildly cool near 61°F 16°C, overcast throughout the day, with increasing humidity and steady pressure. Winds tapering down from S 21 mph 33 km/h to SSW 13 mph 20 km/h. Gusts up to 25 mph 40 km/h.
Wednesday, October 7, 2026
Mid-Morning
56°F 13°C
Sunny
Mid-Afternoon
65°F 19°C
Partly Cloudy
Early-Evening
64°F 18°C
Cloudy
Comfortable at 65°F 19°C, sunny in the morning, cloudy in the afternoon, and sunny this evening, with lower humidity and steady pressure. Winds turning from the NNW to the S at 4 mph 6 km/h.
Thursday, October 8, 2026
Mid-Morning
53°F 12°C
Overcast
Mid-Afternoon
55°F 13°C
Sunny
Early-Evening
57°F 14°C
Partly Cloudy
Crisp with a high near 55°F 13°C, overcast in the morning, becoming sunny through the afternoon and evening, with lower humidity and barometric pressure rising. Winds switching from the ENE to the NNW at 12 mph 18 km/h. Gusts up to 25 mph 40 km/h.
Friday, October 9, 2026
Mid-Morning
38°F 3°C
Sunny
Mid-Afternoon
47°F 8°C
Sunny
Early-Evening
48°F 9°C
Overcast
Brisk around 47°F 8°C, sunny in the morning, becoming cloudy through the afternoon and evening, with lower humidity and steady pressure. Winds moving from the ESE to the E at 6 mph 9 km/h.
Saturday, October 10, 2026
Mid-Morning
40°F 5°C
Sunny
Mid-Afternoon
53°F 12°C
Sunny
Early-Evening
54°F 13°C
Sunny
Cool and brisk at 53°F 12°C, sunny throughout the day, with steady humidity and barometric pressure falling. Winds swinging from the S to the SSE at 15 mph 23 km/h. Gusts up to 30 mph 48 km/h.
Sunday, October 11, 2026
Mid-Morning
48°F 9°C
Partly Cloudy
Mid-Afternoon
65°F 18°C
Overcast
Early-Evening
62°F 17°C
Sunny
Comfortable at 65°F 18°C, partly cloudy through the afternoon, turning cloudy this evening, with lower humidity and steady pressure. Winds out of the NNW at 13 mph 21 km/h.
Monday, October 12, 2026
Mid-Morning
56°F 14°C
Partly Cloudy
Mid-Afternoon
67°F 20°C
Cloudy
Early-Evening
56°F 13°C
Sunny
Cool with a high near 67°F 20°C, cloudy in the morning, partly cloudy in the afternoon, and sunny this evening, with steady humidity and steady pressure. Winds building from SW at 13 mph 21 km/h to NNW at 23 mph 37 km/h. Gusts up to 38 mph 62 km/h.
Tuesday, October 13, 2026
Mid-Morning
39°F 4°C
Overcast
Mid-Afternoon
47°F 8°C
Sunny
Early-Evening
48°F 9°C
Sunny
Brisk around 47°F 8°C, overcast in the morning, becoming sunny through the afternoon and evening, with lower humidity and steady pressure. Winds decreasing from N 21 mph 33 km/h to NE 7 mph 11 km/h.
Wednesday, October 14, 2026
Mid-Morning
43°F 6°C
Sunny
Mid-Afternoon
57°F 14°C
Sunny
Early-Evening
57°F 14°C
Sunny
Cool and brisk at 57°F 14°C, sunny throughout the day, with lower humidity and barometric pressure falling. Winds out of the SSW at 9 mph 15 km/h.
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