Portland, MI Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Portland, a city in Ionia County, Michigan.
Tonight
52°F
Mostly Cloudy then Chance Rain Showers
A chance of rain showers after 2am. Mostly cloudy. Low around 52, with temperatures rising to around 55 overnight. East northeast wind around 10 mph, with gusts as high as 21 mph. Chance of precipitation is 50%. New rainfall amounts between a tenth and quarter of an inch possible.
7-day forecast for Portland
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 52°F | Mostly Cloudy then Chance Rain Showers | 10 mph ENE | 47% |
| Saturday | 66°F | Showers And Thunderstorms | 6 to 10 mph ESE | 80% |
| Saturday Night | 55°F | Showers And Thunderstorms | 6 to 9 mph E | 79% |
| Sunday | 67°F | Rain Showers Likely | 9 to 14 mph NE | 58% |
| Sunday Night | 49°F | Chance Rain Showers then Mostly Cloudy | 10 to 14 mph NE | 33% |
| Monday | 63°F | Mostly Cloudy | 15 mph ENE | 11% |
| Monday Night | 45°F | Mostly Cloudy | 12 to 17 mph NE | 11% |
| Tuesday | 62°F | Partly Sunny then Slight Chance Rain Showers | 16 mph NE | 17% |
| Tuesday Night | 47°F | Chance Rain Showers | 12 to 16 mph NE | 32% |
| Wednesday | 63°F | Chance Rain Showers | 13 mph NE | 32% |
| Wednesday Night | 48°F | Slight Chance Rain Showers then Mostly Cloudy | 6 to 13 mph NE | 23% |
| Thursday | 66°F | Partly Sunny | 7 to 10 mph NE | 6% |
| Thursday Night | 49°F | Mostly Cloudy | 3 to 9 mph NNE | 4% |
| Friday | 70°F | Mostly Sunny | 5 to 9 mph NNE | 7% |
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 Sep 19, 2026.