Summit, SD Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Summit, a town in Grant County, South Dakota.
Overnight
51°F
Partly Cloudy
Partly cloudy, with a low around 51. Northwest wind around 9 mph.
7-day forecast for Summit
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 51°F | Partly Cloudy | 9 mph NW | 0% |
| Tuesday | 69°F | Mostly Sunny | 9 to 13 mph NW | 0% |
| Tuesday Night | 53°F | Mostly Clear | 5 to 10 mph WSW | 0% |
| Wednesday | 75°F | Sunny | 10 to 14 mph WSW | 0% |
| Wednesday Night | 60°F | Partly Cloudy | 8 to 18 mph SW | 1% |
| Thursday | 79°F | Sunny | 14 to 18 mph SW | 4% |
| Thursday Night | 63°F | Mostly Clear | 10 to 16 mph SW | 6% |
| Friday | 81°F | Sunny | 9 to 15 mph SW | 9% |
| Friday Night | 62°F | Mostly Clear | 9 mph SSE | 9% |
| Saturday | 80°F | Sunny | 7 to 13 mph SE | 8% |
| Saturday Night | 63°F | Slight Chance Showers And Thunderstorms | 13 mph ESE | 21% |
| Sunday | 78°F | Slight Chance Rain Showers then Mostly Sunny | 12 mph ENE | 20% |
| Sunday Night | 63°F | Partly Cloudy then Chance Showers And Thunderstorms | 9 mph ENE | 28% |
| Monday | 75°F | Chance Showers And Thunderstorms | 9 to 13 mph NE | 28% |
Forecast source: National Weather Service (api.weather.gov) for Summit (45.306, -97.039). Updated through the day.
Growing snapshot for Summit
Last spring frost
May 14
First fall frost
Sep 28
Growing season
136 days
Hardiness zone
4a
More local growing data for Summit: nearby ZIP 57266 weather · frost dates · planting calendar · South Dakota frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Summit 1 W, Sd (1.8 mi from Summit). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.