Portland, MI Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Portland, a city in Ionia County, Michigan.
This Afternoon
75°F
Mostly Sunny
Mostly sunny. High near 75, with temperatures falling to around 73 in the afternoon. South southwest wind around 16 mph, with gusts as high as 26 mph.
7-day forecast for Portland
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 75°F | Mostly Sunny | 16 mph SSW | 5% |
| Tonight | 62°F | Partly Cloudy | 10 to 14 mph SSE | 12% |
| Wednesday | 71°F | Rain Showers | 13 to 17 mph S | 85% |
| Wednesday Night | 50°F | Chance Rain Showers then Mostly Cloudy | 12 mph SW | 52% |
| Thursday | 59°F | Mostly Cloudy then Chance Rain Showers | 12 to 16 mph SW | 38% |
| Thursday Night | 43°F | Chance Rain Showers | 5 to 9 mph W | 49% |
| Friday | 53°F | Chance Rain Showers | 5 to 12 mph NNW | 53% |
| Friday Night | 34°F | Chance Rain Showers then Mostly Cloudy | 9 mph N | 41% |
| Saturday | 51°F | Mostly Sunny | 8 mph NW | 9% |
| Saturday Night | 32°F | Partly Cloudy | 6 mph WSW | 4% |
| Sunday | 55°F | Mostly Sunny then Slight Chance Rain Showers | 5 to 13 mph W | 22% |
| Sunday Night | 34°F | Slight Chance Rain Showers then Partly Cloudy | 6 to 10 mph WNW | 22% |
| Monday | 59°F | Mostly Sunny | 6 to 13 mph W | 8% |
| Monday Night | 38°F | Partly Cloudy | 12 mph WSW | 6% |
Forecast source: National Weather Service (api.weather.gov) for Portland (42.870, -84.899). Updated through the day.
Growing snapshot for Portland
Last spring frost
May 3
First fall frost
Oct 12
Growing season
161 days
Hardiness zone
6a
More local growing data for Portland: nearby ZIP 48875 weather · frost dates · planting calendar · Michigan frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Ionia 2Ssw, Mi (9.4 mi from Portland). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 3, 2026.