St. Thomas, ND Weather & Growing Conditions
Overnight
32°F
Patchy Fog
Patchy fog. Cloudy. Low around 32, with temperatures rising to around 36 overnight. North northwest wind around 13 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 32°F | Patchy Fog | 13 mph NNW | 3% |
| Wednesday | 48°F | Patchy Fog then Mostly Cloudy | 13 to 16 mph N | 1% |
| Wednesday Night | 27°F | Mostly Cloudy | 17 mph NNW | 0% |
| Thursday | 40°F | Partly Sunny | 7 to 17 mph N | 0% |
| Thursday Night | 16°F | Partly Cloudy | 1 to 5 mph SE | 0% |
| Friday | 46°F | Mostly Sunny | 6 to 15 mph S | 0% |
| Friday Night | 25°F | Partly Cloudy | 7 to 12 mph S | 0% |
| Saturday | 55°F | Mostly Sunny | 9 to 16 mph SW | 5% |
| Saturday Night | 31°F | Partly Cloudy | 7 to 14 mph WNW | 1% |
| Sunday | 54°F | Mostly Sunny | 7 to 10 mph SW | 0% |
| Sunday Night | 34°F | Mostly Cloudy | 10 mph SW | 0% |
| Monday | 58°F | Mostly Sunny | 10 to 22 mph WNW | 1% |
| Monday Night | 30°F | Partly Cloudy | 6 to 12 mph WNW | 0% |
| Tuesday | 51°F | Mostly Sunny | 6 to 9 mph W | 1% |
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 Nov 4, 2026.