Plainfield, IA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Plainfield, a city in Bremer County, Iowa.
Today
75°F
Chance Showers And Thunderstorms
A chance of showers and thunderstorms after 7am. Mostly cloudy. High near 75, with temperatures falling to around 73 in the afternoon. West wind around 10 mph. Chance of precipitation is 50%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast for Plainfield
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 75°F | Chance Showers And Thunderstorms | 10 mph W | 48% |
| Tonight | 59°F | Showers And Thunderstorms Likely | 3 to 9 mph NNW | 59% |
| Wednesday | 73°F | Slight Chance Showers And Thunderstorms then Partly Sunny | 5 mph N | 19% |
| Wednesday Night | 53°F | Mostly Clear | 1 to 5 mph N | 5% |
| Thursday | 78°F | Sunny | 0 to 5 mph E | 1% |
| Thursday Night | 59°F | Mostly Clear | 5 mph SSE | 0% |
| Friday | 81°F | Sunny | 3 to 12 mph S | 8% |
| Friday Night | 64°F | Mostly Clear | 6 to 9 mph S | 11% |
| Saturday | 84°F | Sunny | 5 to 10 mph S | 9% |
| Saturday Night | 68°F | Chance Showers And Thunderstorms | 9 to 13 mph S | 31% |
| Sunday | 85°F | Chance Showers And Thunderstorms | 12 mph ESE | 31% |
| Sunday Night | 67°F | Slight Chance Showers And Thunderstorms | 7 to 10 mph SSE | 35% |
| Monday | 83°F | Chance Showers And Thunderstorms then Slight Chance Showers And Thunderstorms | 8 to 13 mph SE | 35% |
| Monday Night | 67°F | Slight Chance Showers And Thunderstorms | 8 to 12 mph ENE | 38% |
Forecast source: National Weather Service (api.weather.gov) for Plainfield (42.845, -92.536). Updated through the day.
Growing snapshot for Plainfield
Last spring frost
Apr 29
First fall frost
Oct 9
Growing season
162 days
Hardiness zone
5a
More local growing data for Plainfield: nearby ZIP 50666 weather · frost dates · planting calendar · Iowa frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Tripoli, Ia (12.8 mi from Plainfield). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.