Grass Lake, SD 14 Day Weather
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Grass Lake, SD Weather Forecast


Grass Lake, SD Weather Forecast Dated: 151 PM Thu Sep 10 2026
Expect a mild stretch with a mix of sun and clouds and occasional showers over the coming period. moderate humidity and no major pressure swings will dominate.
Thursday, September 10, 2026
Mid-Morning
63°F 17°C
Sunny
Mid-Afternoon
84°F 29°C
Sunny
Early-Evening
77°F 25°C
Sunny
Warm and summery near 84°F 29°C, sunny throughout the day, with lower humidity and barometric pressure falling. Winds turning from the S to the SSE at 15 mph 24 km/h. Gusts up to 26 mph 42 km/h.
Friday, September 11, 2026
Mid-Morning
67°F 20°C
Cloudy
Mid-Afternoon
95°F 35°C
Overcast
Early-Evening
79°F 27°C
Overcast
Hot and sweltering around 95°F 35°C, overcast through the afternoon, turning partly cloudy this evening, with lower humidity and steady pressure. Winds switching from the S to the N at 21 mph 34 km/h. Gusts up to 31 mph 50 km/h.
Saturday, September 12, 2026
Mid-Morning
55°F 13°C
Partly Cloudy
Mid-Afternoon
65°F 18°C
Scattered Showers
Early-Evening
62°F 17°C
Scattered Showers
Comfortable at 65°F 18°C, locally heavy downpours at times, with steady humidity and steady pressure. Winds moving from the N to the NNW at 6 mph 10 km/h.
Sunday, September 13, 2026
Mid-Morning
54°F 12°C
Overcast
Mid-Afternoon
53°F 12°C
Scattered Showers
Early-Evening
56°F 13°C
Scattered Showers
Crisp with a high near 53°F 12°C, periods of heavy rain and gusty conditions, with increasing humidity and steady pressure. Winds swinging from the ENE to the E at 17 mph 27 km/h. Gusts up to 34 mph 55 km/h.
Monday, September 14, 2026
Mid-Morning
57°F 14°C
Fog
Mid-Afternoon
59°F 15°C
Scattered Showers
Early-Evening
62°F 17°C
Sunny
Refreshing around 59°F 15°C, scattered downpours possible, with lower humidity and barometric pressure rising. Winds shifting from the WSW to the W at 10 mph 16 km/h.
Tuesday, September 15, 2026
Mid-Morning
50°F 10°C
Sunny
Mid-Afternoon
62°F 17°C
Sunny
Early-Evening
60°F 15°C
Partly Cloudy
Mildly cool near 62°F 17°C, cloudy in the morning, partly cloudy in the afternoon, and overcast this evening, with steady humidity and steady pressure. Winds turning from the NNW to the SE at 5 mph 7 km/h.
Wednesday, September 16, 2026
Mid-Morning
54°F 12°C
Overcast
Mid-Afternoon
66°F 19°C
Sunny
Early-Evening
64°F 18°C
Overcast
Comfortable at 66°F 19°C, cloudy through the afternoon, turning overcast this evening, with lower humidity and steady pressure.
Thursday, September 17, 2026
Mid-Morning
40°F 5°C
Overcast
Mid-Afternoon
65°F 18°C
Sunny
Early-Evening
70°F 21°C
Sunny
Cool with a high near 65°F 18°C, cloudy in the morning, sunny in the afternoon, and partly cloudy this evening, with lower humidity and barometric pressure falling. Winds easing from ESE 19 mph 30 km/h to E 7 mph 11 km/h.
Friday, September 18, 2026
Mid-Morning
47°F 8°C
Sunny
Mid-Afternoon
61°F 16°C
Sunny
Early-Evening
62°F 17°C
Sunny
Refreshing around 61°F 16°C, sunny throughout the day, with steady humidity and barometric pressure falling.
Saturday, September 19, 2026
Mid-Morning
54°F 12°C
Sunny
Mid-Afternoon
68°F 20°C
Sunny
Early-Evening
68°F 20°C
Sunny
Mild with a high of 68°F 20°C, sunny through the afternoon, turning partly cloudy this evening, with steady humidity and barometric pressure falling. Winds moving from the SSE to the SE at 9 mph 15 km/h.
Sunday, September 20, 2026
Mid-Morning
60°F 16°C
Partly Cloudy
Mid-Afternoon
74°F 24°C
Sunny
Early-Evening
71°F 22°C
Scattered Showers
Pleasant near 74°F 24°C, scattered downpours possible, with increasing humidity and barometric pressure falling. Winds S at 22 mph 35 km/h. Gusts up to 35 mph 55 km/h.
Monday, September 21, 2026
Mid-Morning
64°F 18°C
Scattered Showers
Mid-Afternoon
69°F 20°C
Overcast
Early-Evening
69°F 21°C
Overcast
Comfortable with temperatures reaching 69°F 20°C, locally heavy downpours at times, with lower humidity and steady pressure. Winds out of the WNW at 19 mph 30 km/h. Gusts up to 24 mph 39 km/h.
Tuesday, September 22, 2026
Mid-Morning
49°F 9°C
Overcast
Mid-Afternoon
53°F 12°C
Overcast
Early-Evening
52°F 11°C
Sunny
Brisk around 53°F 12°C, overcast in the morning, partly cloudy in the afternoon, and sunny this evening, with steady humidity and barometric pressure rising. Winds turning from the NW to the SE at 12 mph 20 km/h. Gusts up to 20 mph 33 km/h.
Wednesday, September 23, 2026
Mid-Morning
46°F 8°C
Sunny
Mid-Afternoon
62°F 17°C
Sunny
Early-Evening
61°F 17°C
Sunny
Mildly cool near 62°F 17°C, sunny throughout the day, with lower humidity and barometric pressure falling. Winds switching from the NNE to the SE at 8 mph 13 km/h.
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