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Letcher, SD Weather & Growing Conditions

Local forecast, frost dates, hardiness zone and planting guidance for Letcher, a town in Sanborn County, South Dakota.

Tonight
60°F
Cloudy
Cloudy, with a low around 60. North wind 5 to 10 mph.

7-day forecast for Letcher

WhenTempForecastWindPrecip
Tonight 60°F Cloudy 5 to 10 mph N 13%
Saturday 68°F Patchy Fog then Cloudy 10 to 15 mph NNE 12%
Saturday Night 56°F Cloudy 10 to 15 mph NNE 4%
Sunday 65°F Mostly Cloudy then Chance Rain Showers 10 to 15 mph NE 45%
Sunday Night 53°F Rain Showers Likely 10 to 15 mph ENE 72%
Monday 62°F Rain Showers Likely 10 mph E 72%
Monday Night 48°F Mostly Cloudy 5 to 10 mph E 7%
Tuesday 66°F Partly Sunny 5 to 15 mph SE 4%
Tuesday Night 51°F Mostly Cloudy 10 to 15 mph SE 7%
Wednesday 70°F Slight Chance Rain Showers 15 mph SSE 18%
Wednesday Night 54°F Chance Rain Showers 15 mph SSE 38%
Thursday 71°F Chance Rain Showers then Partly Sunny 10 to 15 mph SSE 38%
Thursday Night 55°F Mostly Cloudy 10 mph SE 8%
Friday 72°F Partly Sunny 10 to 15 mph SE 9%

Forecast source: National Weather Service (api.weather.gov) for Letcher (43.900, -98.146). Updated through the day.

Growing snapshot for Letcher

Last spring frost
Apr 27
First fall frost
Oct 11
Growing season
167 days
Hardiness zone
5a

More local growing data for Letcher: nearby ZIP 57359 weather · frost dates · planting calendar · South Dakota frost dates

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Climate data from the nearest NOAA station, Mitchell, Sd (10.4 mi from Letcher). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.