St. Thomas, ND Weather & Growing Conditions
Today
71°F
Sunny
Sunny, with a high near 71. West northwest wind 13 to 16 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 71°F | Sunny | 13 to 16 mph WNW | 0% |
| Tonight | 50°F | Mostly Clear | 5 to 12 mph WSW | 0% |
| Wednesday | 80°F | Mostly Sunny | 8 to 18 mph SW | 0% |
| Wednesday Night | 57°F | Partly Cloudy | 8 to 14 mph SW | 13% |
| Thursday | 82°F | Sunny | 8 to 15 mph W | 8% |
| Thursday Night | 57°F | Mostly Clear | 7 to 12 mph W | 5% |
| Friday | 78°F | Sunny | 7 to 14 mph NW | 5% |
| Friday Night | 54°F | Mostly Clear | 5 to 12 mph NNW | 6% |
| Saturday | 79°F | Mostly Sunny | 5 to 13 mph NNW | 7% |
| Saturday Night | 55°F | Partly Cloudy | 5 to 12 mph N | 10% |
| Sunday | 77°F | Mostly Sunny | 6 to 10 mph NNW | 10% |
| Sunday Night | 56°F | Partly Cloudy then Slight Chance Rain Showers | 5 to 10 mph N | 23% |
| Monday | 77°F | Slight Chance Rain Showers then Mostly Sunny | 5 to 10 mph N | 23% |
| Monday Night | 56°F | Partly Cloudy | 5 to 10 mph N | 13% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for St. Thomas, ND
Last spring frost
May 4
First fall frost
Oct 7
Growing season
156 days
Hardiness zone
4a
Explore more for St. Thomas, ND: full frost dates · planting calendar · North Dakota frost dates
Climate data from the nearest NOAA station, Grafton, Nd (14.3 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.