Portland, ND Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Portland, a city in Traill County, North Dakota.
Tonight
34°F
Cloudy then Slight Chance Light Rain
A slight chance of rain between 1am and 2am. Cloudy. Low around 34, with temperatures rising to around 36 overnight. North northwest wind 15 to 20 mph. Chance of precipitation is 20%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast for Portland
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 34°F | Cloudy then Slight Chance Light Rain | 15 to 20 mph NNW | 15% |
| Wednesday | 46°F | Mostly Cloudy | 23 mph N | 13% |
| Wednesday Night | 29°F | Mostly Cloudy | 16 to 21 mph N | 0% |
| Thursday | 39°F | Partly Sunny | 9 to 20 mph N | 0% |
| Thursday Night | 23°F | Partly Cloudy | 1 to 7 mph E | 0% |
| Friday | 44°F | Mostly Sunny | 1 to 14 mph S | 0% |
| Friday Night | 27°F | Partly Cloudy | 9 mph SSW | 0% |
| Saturday | 54°F | Mostly Sunny | 8 to 16 mph WSW | 8% |
| Saturday Night | 32°F | Partly Cloudy | 8 to 12 mph WNW | 6% |
| Sunday | 54°F | Mostly Sunny | 8 to 12 mph WSW | 1% |
| Sunday Night | 35°F | Partly Cloudy | 8 to 12 mph SSW | 1% |
| Monday | 56°F | Mostly Sunny | 13 to 23 mph W | 1% |
| Monday Night | 32°F | Mostly Clear | 6 to 14 mph W | 0% |
| Tuesday | 51°F | Mostly Sunny | 6 to 12 mph WNW | 0% |
Forecast source: National Weather Service (api.weather.gov) for Portland (47.500, -97.369). Updated through the day.
Growing snapshot for Portland
Last spring frost
May 13
First fall frost
Sep 27
Growing season
136 days
Hardiness zone
4a
More local growing data for Portland: nearby ZIP 58257 weather · frost dates · planting calendar · North Dakota frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Mayville, Nd (3.2 mi from Portland). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.