St. Thomas, ND Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for St. Thomas, a city in Pembina County, North Dakota.
This Afternoon
72°F
Mostly Cloudy
Mostly cloudy. High near 72, with temperatures falling to around 68 in the afternoon. South wind around 13 mph.
7-day forecast for St. Thomas
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 72°F | Mostly Cloudy | 13 mph S | 11% |
| Tonight | 54°F | Mostly Cloudy | 2 to 10 mph S | 8% |
| Saturday | 69°F | Slight Chance Rain Showers then Mostly Cloudy | 1 to 15 mph NW | 24% |
| Saturday Night | 46°F | Mostly Cloudy | 7 to 15 mph NNE | 0% |
| Sunday | 68°F | Mostly Cloudy | 8 mph NE | 0% |
| Sunday Night | 43°F | Partly Cloudy | 1 to 7 mph E | 0% |
| Monday | 69°F | Sunny | 1 to 8 mph ESE | 0% |
| Monday Night | 43°F | Mostly Clear | 7 mph SSE | 0% |
| Tuesday | 70°F | Sunny | 7 to 18 mph SSE | 0% |
| Tuesday Night | 47°F | Partly Cloudy | 15 mph SSE | 1% |
| Wednesday | 71°F | Partly Sunny | 14 to 20 mph SSE | 8% |
| Wednesday Night | 52°F | Mostly Cloudy | 12 to 16 mph S | 12% |
| Thursday | 74°F | Mostly Sunny | 10 to 14 mph S | 12% |
| Thursday Night | 53°F | Mostly Clear | 8 to 12 mph SSE | 10% |
Forecast source: National Weather Service (api.weather.gov) for St. Thomas (48.619, -97.447). Updated through the day.
Growing snapshot for St. Thomas
Last spring frost
May 4
First fall frost
Oct 7
Growing season
156 days
Hardiness zone
4a
More local growing data for St. Thomas: nearby ZIP 58276 weather · frost dates · planting calendar · North Dakota frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Grafton, Nd (14.3 mi from St. Thomas). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 18, 2026.