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.
Overnight
52°F
Mostly Clear
Mostly clear, with a low around 52. West northwest wind 8 to 12 mph. New rainfall amounts less than a tenth of an inch possible.
7-day forecast for St. Thomas
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 52°F | Mostly Clear | 8 to 12 mph WNW | 6% |
| Tuesday | 71°F | Sunny | 9 to 15 mph WNW | 0% |
| Tuesday Night | 50°F | Mostly Clear | 5 to 10 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 | 7% |
| Saturday | 79°F | Mostly Sunny | 5 to 13 mph NNW | 7% |
| Saturday Night | 55°F | Partly Cloudy | 5 to 12 mph N | 11% |
| Sunday | 77°F | Mostly Sunny | 6 to 10 mph NNW | 11% |
| Sunday Night | 56°F | Slight Chance Rain Showers | 5 to 10 mph N | 23% |
| Monday | 77°F | Slight Chance Rain Showers | 5 to 10 mph N | 23% |
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 Aug 4, 2026.