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Grenville, SD Weather Forecast
Grenville, SD Weather Forecast Dated: 309 AM Wed Sep 09 2026
Expect a cool pattern with a mix of sun and clouds and frequent chances of rain over the coming period. generally humid conditions and no major pressure swings will dominate.
Wednesday, September 9, 2026
Mid-Morning
63°F 17°C
Sunny
Mid-Afternoon
74°F 23°C
Sunny
Early-Evening
71°F 22°C
Sunny
Pleasant near 74°F 23°C, sunny throughout the day, with lower humidity and steady pressure. Winds out of the NW at 15 mph 24 km/h.
Thursday, September 10, 2026
Mid-Morning
63°F 17°C
Sunny
Mid-Afternoon
82°F 28°C
Sunny
Early-Evening
78°F 26°C
Sunny
Balmy with temperatures reaching 82°F 28°C, sunny throughout the day, with lower humidity and barometric pressure falling. Winds switching from the SSW to the SSE at 15 mph 24 km/h. Gusts up to 26 mph 42 km/h.
Friday, September 11, 2026
Mid-Morning
68°F 20°C
Cloudy
Mid-Afternoon
90°F 32°C
Overcast
Early-Evening
76°F 24°C
Overcast
Sizzling hot with 90°F 32°C, cloudy in the morning, overcast in the afternoon, and partly cloudy this evening, with lower humidity and steady pressure. Winds moving from the S to the NNW at 22 mph 36 km/h. Gusts up to 36 mph 57 km/h.
Saturday, September 12, 2026
Mid-Morning
51°F 10°C
Sunny
Mid-Afternoon
68°F 20°C
Partly Cloudy
Early-Evening
63°F 17°C
Cloudy
Mild temperatures up to 68°F 20°C, sunny in the morning, cloudy in the afternoon, and overcast this evening, with lower humidity and steady pressure. Winds swinging from the NW to the N at 6 mph 9 km/h.
Sunday, September 13, 2026
Mid-Morning
53°F 12°C
Overcast
Mid-Afternoon
52°F 11°C
Overcast
Early-Evening
52°F 11°C
Light Showers
Brisk around 52°F 11°C, mainly dry until evening showers arrive, with increasing humidity and steady pressure. Winds shifting from the NE to the E at 14 mph 21 km/h. Gusts up to 24 mph 39 km/h.
Monday, September 14, 2026
Mid-Morning
49°F 9°C
Light Showers
Mid-Afternoon
48°F 9°C
Light Showers
Early-Evening
48°F 9°C
Light Showers
Cool and brisk at 48°F 9°C, on-and-off showers throughout the day, with steady humidity and steady pressure. Winds decreasing from E 14 mph 22 km/h to SW 6 mph 9 km/h.
Tuesday, September 15, 2026
Mid-Morning
46°F 8°C
Overcast
Mid-Afternoon
64°F 18°C
Sunny
Early-Evening
65°F 18°C
Sunny
Comfortable at 64°F 18°C, partly cloudy in the morning, becoming sunny through the afternoon and evening, with lower humidity and steady pressure.
Wednesday, September 16, 2026
Mid-Morning
60°F 15°C
Partly Cloudy
Mid-Afternoon
67°F 19°C
Overcast
Early-Evening
64°F 18°C
Light Showers
Cool with a high near 67°F 19°C, mainly dry until evening showers arrive, with increasing humidity and barometric pressure falling. Winds switching from the SSE to the ESE at 16 mph 25 km/h. Gusts up to 28 mph 45 km/h.
Thursday, September 17, 2026
Mid-Morning
68°F 20°C
Overcast
Mid-Afternoon
74°F 23°C
Scattered Showers
Early-Evening
66°F 19°C
Partly Cloudy
Mild temperatures up to 74°F 23°C, locally heavy downpours at times, with steady humidity and barometric pressure rising. Winds building from WSW at 6 mph 10 km/h to NNE at 14 mph 22 km/h. Gusts up to 22 mph 35 km/h.
Friday, September 18, 2026
Mid-Morning
45°F 7°C
Overcast
Mid-Afternoon
43°F 6°C
Light Showers
Early-Evening
42°F 6°C
Heavy Rain
Nippy around 43°F 6°C, drier morning followed by showers lasting through evening, with steady humidity and steady pressure. Winds swinging from the NNE to the ENE at 15 mph 25 km/h. Gusts up to 30 mph 47 km/h.
Saturday, September 19, 2026
Mid-Morning
41°F 5°C
Scattered Showers
Mid-Afternoon
42°F 5°C
Scattered Showers
Early-Evening
42°F 6°C
Overcast
Biting cold near 42°F 5°C, scattered downpours possible, with steady humidity and barometric pressure falling. Winds out of the E at 13 mph 20 km/h. Gusts up to 24 mph 39 km/h.
Sunday, September 20, 2026
Mid-Morning
52°F 11°C
Light Showers
Mid-Afternoon
57°F 14°C
Light Showers
Early-Evening
48°F 9°C
Light Showers
Crisp with a high near 57°F 14°C, on-and-off showers throughout the day, with steady humidity and steady pressure. Winds turning from the SE to the NW at 15 mph 24 km/h. Gusts up to 27 mph 44 km/h.
Monday, September 21, 2026
Mid-Morning
43°F 6°C
Partly Cloudy
Mid-Afternoon
54°F 12°C
Sunny
Early-Evening
56°F 13°C
Sunny
Brisk around 54°F 12°C, sunny throughout the day, with lower humidity and steady pressure. Winds decreasing from WNW 15 mph 24 km/h to SE 6 mph 9 km/h.
Tuesday, September 22, 2026
Mid-Morning
48°F 9°C
Partly Cloudy
Mid-Afternoon
61°F 16°C
Sunny
Early-Evening
61°F 17°C
Sunny
Mildly cool near 61°F 16°C, sunny in the morning, partly cloudy in the afternoon, and overcast this evening, with steady humidity and barometric pressure falling. Winds moving from the ESE to the SE at 13 mph 21 km/h. Gusts up to 25 mph 40 km/h.
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