Belle Fourche, SD Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Belle Fourche, a city in Lawrence County, South Dakota.
Overnight
56°F
Patchy Fog
Patchy fog before 4am, then patchy fog and a slight chance of showers and thunderstorms between 4am and 5am, then patchy fog and a chance of showers and thunderstorms. Cloudy. Low around 56, with temperatures rising to around 58 overnight. East wind around 3 mph. Chance of precipitation is 30%.
7-day forecast for Belle Fourche
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 56°F | Patchy Fog | 3 mph E | 26% |
| Saturday | 66°F | Areas Of Fog then Showers And Thunderstorms Likely | 5 to 15 mph E | 61% |
| Saturday Night | 50°F | Showers And Thunderstorms | 16 mph E | 86% |
| Sunday | 59°F | Rain Showers | 14 to 17 mph E | 79% |
| Sunday Night | 47°F | Showers And Thunderstorms | 8 to 16 mph E | 82% |
| Monday | 66°F | Mostly Cloudy then Chance Rain Showers | 8 to 20 mph E | 25% |
| Monday Night | 46°F | Partly Cloudy | 5 to 21 mph SE | 3% |
| Tuesday | 75°F | Sunny | 3 to 17 mph E | 3% |
| Tuesday Night | 50°F | Mostly Clear | 1 to 18 mph SE | 5% |
| Wednesday | 78°F | Mostly Sunny then Slight Chance Showers And Thunderstorms | 1 to 7 mph SE | 21% |
| Wednesday Night | 51°F | Slight Chance Showers And Thunderstorms then Partly Cloudy | 2 to 7 mph S | 23% |
| Thursday | 80°F | Mostly Sunny | 2 to 10 mph E | 7% |
| Thursday Night | 51°F | Mostly Clear | 3 to 10 mph SE | 4% |
| Friday | 82°F | Mostly Sunny | 3 to 17 mph SE | 5% |
Forecast source: National Weather Service (api.weather.gov) for Belle Fourche (44.664, -103.859). Updated through the day.
Growing snapshot for Belle Fourche
Last spring frost
May 12
First fall frost
Oct 2
Growing season
143 days
Hardiness zone
5b
More local growing data for Belle Fourche: nearby ZIP 57779 weather · frost dates · planting calendar · South Dakota frost dates
Nearby towns & communities
Boulder Canyon
Central City
Crook City
Deadwood
Lead
Mountain Plains
North Spearfish
Spearfish
St. Onge
Whitewood
Climate data from the nearest NOAA station, Spearfish, Sd (7.4 mi from Belle Fourche). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.