Plainwell, MI Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Plainwell, a city in Allegan County, Michigan.
This Afternoon
70°F
Patchy Fog
Rain showers likely and patchy fog before 5pm, then patchy fog and showers and thunderstorms likely. Mostly cloudy. High near 70, with temperatures falling to around 68 in the afternoon. East southeast wind around 8 mph. Chance of precipitation is 60%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast for Plainwell
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 70°F | Patchy Fog | 8 mph ESE | 59% |
| Tonight | 60°F | Patchy Fog | 5 mph ESE | 91% |
| Sunday | 69°F | Patchy Fog | 3 to 12 mph NE | 74% |
| Sunday Night | 48°F | Mostly Cloudy | 7 to 10 mph NE | 5% |
| Monday | 64°F | Slight Chance Rain Showers | 12 mph ENE | 17% |
| Monday Night | 45°F | Mostly Cloudy | 8 to 12 mph ENE | 11% |
| Tuesday | 63°F | Partly Sunny | 8 to 13 mph ENE | 10% |
| Tuesday Night | 47°F | Mostly Cloudy then Slight Chance Rain Showers | 8 to 13 mph ENE | 15% |
| Wednesday | 63°F | Chance Rain Showers | 12 mph ENE | 37% |
| Wednesday Night | 48°F | Chance Rain Showers then Mostly Cloudy | 5 to 12 mph ENE | 37% |
| Thursday | 67°F | Partly Sunny | 5 to 8 mph ENE | 7% |
| Thursday Night | 48°F | Mostly Cloudy | 1 to 8 mph ENE | 5% |
| Friday | 71°F | Partly Sunny | 2 to 7 mph NE | 3% |
| Friday Night | 47°F | Partly Cloudy | 1 to 7 mph NE | 3% |
Forecast source: National Weather Service (api.weather.gov) for Plainwell (42.445, -85.642). Updated through the day.
Growing snapshot for Plainwell
Last spring frost
Apr 29
First fall frost
Oct 20
Growing season
173 days
Hardiness zone
6a
More local growing data for Plainwell: nearby ZIP 49080 weather · frost dates · planting calendar · Michigan frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Gull Lake Biological Stn, Mi (11.2 mi from Plainwell). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.