Sinai, SD Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Sinai, a town in Brookings County, South Dakota.
Overnight
57°F
Areas Of Fog
Areas of fog. Cloudy, with a low around 57. Northeast wind 5 to 10 mph.
7-day forecast for Sinai
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 57°F | Areas Of Fog | 5 to 10 mph NE | 10% |
| Saturday | 64°F | Patchy Fog | 10 to 15 mph NNE | 15% |
| Saturday Night | 51°F | Mostly Cloudy | 10 to 15 mph NNE | 7% |
| Sunday | 64°F | Mostly Cloudy | 15 mph NE | 4% |
| Sunday Night | 48°F | Chance Rain Showers | 10 to 15 mph ENE | 47% |
| Monday | 61°F | Chance Rain Showers | 10 mph E | 47% |
| Monday Night | 43°F | Mostly Cloudy | 5 to 10 mph E | 9% |
| Tuesday | 63°F | Mostly Sunny | 5 to 15 mph SE | 3% |
| Tuesday Night | 44°F | Partly Cloudy | 10 mph SE | 2% |
| Wednesday | 66°F | Mostly Sunny | 10 to 15 mph SSE | 7% |
| Wednesday Night | 49°F | Chance Rain Showers | 10 mph SSE | 32% |
| Thursday | 68°F | Chance Rain Showers | 10 to 15 mph SSE | 32% |
| Thursday Night | 52°F | Mostly Cloudy then Slight Chance Rain Showers | 5 to 10 mph SSE | 18% |
| Friday | 70°F | Slight Chance Rain Showers then Partly Sunny | 10 to 15 mph SSE | 18% |
Forecast source: National Weather Service (api.weather.gov) for Sinai (44.244, -97.044). Updated through the day.
Growing snapshot for Sinai
Last spring frost
May 3
First fall frost
Oct 2
Growing season
151 days
Hardiness zone
4b
More local growing data for Sinai: nearby ZIP 57061 weather · frost dates · planting calendar · South Dakota frost dates
Nearby towns & communities
Aurora
Brookings
Bruce
Bushnell
Elkton
Newdale Colony
Norfeld Colony
Rolland Colony
Spring Lake Colony
Volga
Ward
White
Climate data from the nearest NOAA station, Arlington 1 W, Sd (10.3 mi from Sinai). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.