Portland, MI Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Portland, a city in Ionia County, Michigan.
Overnight
56°F
Clear
Clear, with a low around 56. South wind around 5 mph.
7-day forecast for Portland
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 56°F | Clear | 5 mph S | 0% |
| Tuesday | 86°F | Sunny | 5 to 9 mph SSW | 0% |
| Tuesday Night | 60°F | Mostly Clear | 7 mph SW | 0% |
| Wednesday | 84°F | Partly Sunny then Slight Chance Showers And Thunderstorms | 6 to 10 mph SW | 43% |
| Wednesday Night | 62°F | Chance Showers And Thunderstorms then Showers And Thunderstorms | 2 to 8 mph W | 83% |
| Thursday | 80°F | Showers And Thunderstorms | 3 to 7 mph W | 83% |
| Thursday Night | 59°F | Chance Showers And Thunderstorms then Partly Cloudy | 1 to 5 mph S | 46% |
| Friday | 84°F | Mostly Sunny | 1 to 6 mph SW | 12% |
| Friday Night | 60°F | Mostly Clear | 5 mph WSW | 12% |
| Saturday | 86°F | Sunny | 5 to 13 mph SW | 4% |
| Saturday Night | 65°F | Chance Rain Showers | 5 to 12 mph SW | 28% |
| Sunday | 87°F | Chance Rain Showers | 8 to 17 mph SW | 28% |
| Sunday Night | 65°F | Chance Rain Showers | 8 to 16 mph WSW | 48% |
| Monday | 86°F | Chance Rain Showers | 10 mph W | 48% |
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 Aug 4, 2026.