Johnson Dam, SD 14 Day Weather
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Johnson Dam, SD Weather Forecast


Johnson Dam, SD Weather Forecast Dated: 1244 AM Fri Sep 18 2026
Expect a cool pattern with a mix of sun and clouds and mostly dry weather over the coming period. moderate humidity and no major pressure swings will dominate.
Friday, September 18, 2026
Mid-Morning
55°F 13°C
Partly Cloudy
Mid-Afternoon
58°F 14°C
Scattered Showers
Early-Evening
55°F 13°C
Overcast
Refreshing around 58°F 14°C, periods of heavy rain and gusty conditions, with steady humidity and steady pressure. Winds out of the E at 9 mph 15 km/h.
Saturday, September 19, 2026
Mid-Morning
51°F 11°C
Scattered Showers
Mid-Afternoon
54°F 12°C
Scattered Showers
Early-Evening
53°F 12°C
Overcast
Cool and brisk at 54°F 12°C, scattered downpours possible, with steady humidity and steady pressure. Winds switching from the E to the ESE at 9 mph 15 km/h.
Sunday, September 20, 2026
Mid-Morning
49°F 9°C
Overcast
Mid-Afternoon
58°F 15°C
Overcast
Early-Evening
53°F 12°C
Overcast
Comfortable at 58°F 15°C, overcast throughout the day, with lower humidity and steady pressure. Winds moving from the E to the SSW at 8 mph 13 km/h.
Monday, September 21, 2026
Mid-Morning
49°F 9°C
Overcast
Mid-Afternoon
54°F 12°C
Partly Cloudy
Early-Evening
51°F 11°C
Scattered Showers
Crisp with a high near 54°F 12°C, periods of heavy rain and gusty conditions, with lower humidity and steady pressure. Winds out of the SE at 11 mph 18 km/h. Gusts up to 21 mph 34 km/h.
Tuesday, September 22, 2026
Mid-Morning
46°F 8°C
Overcast
Mid-Afternoon
59°F 15°C
Overcast
Early-Evening
59°F 15°C
Sunny
Refreshing around 59°F 15°C, overcast through the afternoon, turning sunny this evening, with lower humidity and steady pressure. Winds shifting from the SSE to the SE at 11 mph 17 km/h. Gusts up to 21 mph 35 km/h.
Wednesday, September 23, 2026
Mid-Morning
55°F 13°C
Overcast
Mid-Afternoon
72°F 22°C
Overcast
Early-Evening
76°F 25°C
Overcast
Pleasant near 72°F 22°C, overcast throughout the day, with lower humidity and steady pressure.
Thursday, September 24, 2026
Mid-Morning
53°F 12°C
Sunny
Mid-Afternoon
68°F 20°C
Sunny
Early-Evening
68°F 20°C
Sunny
Comfortable with temperatures reaching 68°F 20°C, sunny throughout the day, with steady humidity and steady pressure. Winds turning from the E to the SE at 10 mph 16 km/h. Gusts up to 21 mph 34 km/h.
Friday, September 25, 2026
Mid-Morning
58°F 14°C
Sunny
Mid-Afternoon
71°F 22°C
Sunny
Early-Evening
66°F 19°C
Overcast
Enjoyable around 71°F 22°C, sunny in the morning, partly cloudy in the afternoon, and cloudy this evening, with lower humidity and barometric pressure falling. Winds out of the SSE at 19 mph 31 km/h. Gusts up to 30 mph 47 km/h.
Saturday, September 26, 2026
Mid-Morning
58°F 14°C
Partly Cloudy
Mid-Afternoon
80°F 27°C
Overcast
Early-Evening
78°F 26°C
Overcast
Warm temperatures up to 80°F 27°C, cloudy in the morning, overcast in the afternoon, and cloudy this evening, with lower humidity and barometric pressure falling. Winds blowing from the SSE at 19 mph 31 km/h. Gusts up to 32 mph 51 km/h.
Sunday, September 27, 2026
Mid-Morning
56°F 13°C
Sunny
Mid-Afternoon
70°F 21°C
Sunny
Early-Evening
71°F 22°C
Overcast
Mild with a high of 70°F 21°C, sunny through the afternoon, turning cloudy this evening, with lower humidity and steady pressure. Winds decreasing from NW 13 mph 22 km/h to ENE 4 mph 7 km/h.
Monday, September 28, 2026
Mid-Morning
51°F 11°C
Light Showers
Mid-Afternoon
62°F 17°C
Cloudy
Early-Evening
58°F 14°C
Sunny
Comfortable at 62°F 17°C, scattered morning showers before drying out later, with lower humidity and steady pressure. Winds out of the NW at 10 mph 16 km/h. Gusts up to 22 mph 35 km/h.
Tuesday, September 29, 2026
Mid-Morning
45°F 7°C
Overcast
Mid-Afternoon
49°F 9°C
Overcast
Early-Evening
42°F 5°C
Overcast
Crisp with a high near 49°F 9°C, overcast throughout the day, with increasing humidity and barometric pressure rising. Winds turning from the WNW to the NW at 16 mph 26 km/h. Gusts up to 27 mph 44 km/h.
Wednesday, September 30, 2026
Mid-Morning
40°F 4°C
Scattered Showers
Mid-Afternoon
42°F 5°C
Overcast
Early-Evening
41°F 5°C
Overcast
Nippy around 42°F 5°C, periods of heavy rain and gusty conditions, with lower humidity and steady pressure. Winds switching from the NW to the NNW at 8 mph 13 km/h.
Thursday, October 1, 2026
Mid-Morning
40°F 5°C
Sunny
Mid-Afternoon
52°F 11°C
Sunny
Early-Evening
55°F 13°C
Sunny
Cool and brisk at 52°F 11°C, sunny through the afternoon, turning partly cloudy this evening, with lower humidity and barometric pressure falling.
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