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St. Onge, SD Weather Forecast
St. Onge, SD Weather Forecast Dated: 254 AM Mon Sep 21 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.
Monday, September 21, 2026
Mid-Morning
53°F 12°C
Light Fog
Mid-Afternoon
56°F 14°C
Light Showers
Early-Evening
54°F 12°C
Partly Cloudy
Brisk around 56°F 14°C, drier morning followed by scattered afternoon showers, with steady humidity and steady pressure. Winds turning from the E to the ESE at 12 mph 18 km/h.
Tuesday, September 22, 2026
Mid-Morning
59°F 15°C
Sunny
Mid-Afternoon
75°F 24°C
Sunny
Early-Evening
64°F 17°C
Overcast
Comfortable with temperatures reaching 75°F 24°C, sunny through the afternoon, turning partly cloudy this evening, with steady humidity and barometric pressure falling. Winds switching from the ESE to the SSE at 9 mph 15 km/h.
Wednesday, September 23, 2026
Mid-Morning
69°F 21°C
Overcast
Mid-Afternoon
74°F 23°C
Nearby Thunderstorms
Early-Evening
68°F 20°C
Nearby Thunderstorms
Enjoyable around 74°F 23°C, heavy thunderstorms conditions at times, with steady humidity and steady pressure. Winds moving from the WSW to the SW at 5 mph 8 km/h.
Thursday, September 24, 2026
Mid-Morning
68°F 20°C
Cloudy
Mid-Afternoon
77°F 25°C
Overcast
Early-Evening
66°F 19°C
Overcast
Mild temperatures up to 77°F 25°C, overcast throughout the day, with steady humidity and steady pressure. Winds swinging from the ESE to the S at 7 mph 11 km/h.
Friday, September 25, 2026
Mid-Morning
66°F 19°C
Sunny
Mid-Afternoon
76°F 25°C
Sunny
Early-Evening
66°F 19°C
Sunny
Mild with a high of 76°F 25°C, sunny throughout the day, with steady humidity and barometric pressure falling. Winds building from E at 7 mph 11 km/h to SE at 16 mph 26 km/h. Gusts up to 28 mph 46 km/h.
Saturday, September 26, 2026
Mid-Morning
73°F 23°C
Sunny
Mid-Afternoon
80°F 26°C
Partly Cloudy
Early-Evening
67°F 19°C
Overcast
Warm and summery near 80°F 26°C, sunny in the morning, partly cloudy in the afternoon, and cloudy this evening, with increasing humidity and barometric pressure rising. Winds turning from the W to the NW at 7 mph 12 km/h.
Sunday, September 27, 2026
Mid-Morning
55°F 13°C
Scattered Showers
Mid-Afternoon
58°F 14°C
Partly Cloudy
Early-Evening
53°F 12°C
Cloudy
Comfortable at 58°F 14°C, periods of heavy rain and gusty conditions, with steady humidity and steady pressure.
Monday, September 28, 2026
Mid-Morning
54°F 12°C
Overcast
Mid-Afternoon
67°F 19°C
Sunny
Early-Evening
58°F 15°C
Sunny
Cool with a high near 67°F 19°C, overcast in the morning, becoming sunny through the afternoon and evening, with lower humidity and steady pressure.
Tuesday, September 29, 2026
Mid-Morning
65°F 18°C
Sunny
Mid-Afternoon
79°F 26°C
Sunny
Early-Evening
67°F 20°C
Sunny
Mild temperatures up to 79°F 26°C, sunny throughout the day, with steady humidity and barometric pressure falling. Winds out of the ENE at 9 mph 14 km/h.
Wednesday, September 30, 2026
Mid-Morning
73°F 23°C
Sunny
Mid-Afternoon
87°F 31°C
Sunny
Early-Evening
74°F 24°C
Sunny
Very warm with a high of 87°F 31°C, sunny through the afternoon, turning partly cloudy this evening, with steady humidity and steady pressure. Winds moving from the SSW to the WSW at 7 mph 11 km/h.
Thursday, October 1, 2026
Mid-Morning
55°F 13°C
Light Showers
Mid-Afternoon
53°F 12°C
Scattered Showers
Early-Evening
55°F 13°C
Light Showers
Chilly near 53°F 12°C, scattered downpours possible, with lower humidity and barometric pressure rising. Winds swinging from the NW to the SSW at 7 mph 11 km/h.
Friday, October 2, 2026
Mid-Morning
61°F 16°C
Sunny
Mid-Afternoon
74°F 23°C
Sunny
Early-Evening
61°F 16°C
Sunny
Comfortable with temperatures reaching 74°F 23°C, sunny throughout the day, with steady humidity and barometric pressure falling. Winds out of the E at 11 mph 18 km/h.
Saturday, October 3, 2026
Mid-Morning
70°F 21°C
Sunny
Mid-Afternoon
79°F 26°C
Sunny
Early-Evening
69°F 20°C
Overcast
Enjoyable around 79°F 26°C, sunny through the afternoon, turning overcast this evening, with steady humidity and barometric pressure falling. Winds turning from the SW to the S at 7 mph 12 km/h.
Sunday, October 4, 2026
Mid-Morning
71°F 22°C
Overcast
Mid-Afternoon
66°F 19°C
Sunny
Early-Evening
49°F 10°C
Light Showers
Mildly cool near 66°F 19°C, mainly dry until evening showers arrive, with increasing humidity and barometric pressure rising. Winds increasing from the W at 10 mph 15 km/h to WNW at 19 mph 30 km/h. Gusts up to 28 mph 45 km/h.
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