Summit, SD Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Summit, a town in Grant County, South Dakota.
This Afternoon
45°F
Chance Light Rain
A chance of rain and patchy fog. Cloudy. High near 45, with temperatures falling to around 41 in the afternoon. North wind around 21 mph, with gusts as high as 33 mph. Chance of precipitation is 50%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast for Summit
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 45°F | Chance Light Rain | 21 mph N | 49% |
| Tonight | 37°F | Light Rain | 21 mph NNW | 89% |
| Wednesday | 41°F | Light Rain | 22 mph NNW | 89% |
| Wednesday Night | 33°F | Chance Light Rain | 20 mph NNW | 30% |
| Thursday | 38°F | Patchy Fog then Partly Sunny | 12 to 17 mph N | 3% |
| Thursday Night | 29°F | Mostly Cloudy | 3 to 10 mph N | 1% |
| Friday | 41°F | Partly Sunny | 6 mph SSW | 0% |
| Friday Night | 31°F | Partly Cloudy | 5 to 9 mph SW | 0% |
| Saturday | 51°F | Mostly Sunny | 9 to 15 mph W | 2% |
| Saturday Night | 36°F | Partly Cloudy | 13 mph WNW | 4% |
| Sunday | 53°F | Sunny | 8 to 12 mph WSW | 2% |
| Sunday Night | 40°F | Partly Cloudy | 8 to 15 mph SW | 0% |
| Monday | 55°F | Mostly Sunny | 12 to 17 mph WNW | 0% |
| Monday Night | 38°F | Mostly Clear | 8 to 12 mph WNW | 0% |
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 Nov 4, 2026.