La Porte City, IA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for La Porte City, a city in Black Hawk County, Iowa.
Today
80°F
Patchy Fog then Chance Showers And Thunderstorms
Patchy fog and showers and thunderstorms likely before 10am, then a chance of showers and thunderstorms between 10am and 11am, then showers and thunderstorms likely between 11am and noon, then a chance of showers and thunderstorms between noon and 3pm, then showers and thunderstorms likely between 3pm and 4pm, then a chance of showers and thunderstorms. Mostly cloudy. High near 80, with temperatures falling to around 77 in the afternoon. South southwest wind around 9 mph. Chance of precipitation is 70%. New rainfall amounts between a tenth and quarter of an inch possible.
7-day forecast for La Porte City
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 80°F | Patchy Fog then Chance Showers And Thunderstorms | 9 mph SSW | 69% |
| Tonight | 61°F | Chance Showers And Thunderstorms | 10 mph N | 46% |
| Sunday | 67°F | Chance Rain Showers then Chance Drizzle | 10 to 15 mph NE | 41% |
| Sunday Night | 55°F | Chance Rain Showers | 14 mph ENE | 41% |
| Monday | 63°F | Chance Rain Showers | 14 mph NE | 41% |
| Monday Night | 49°F | Chance Rain Showers | 8 to 13 mph NE | 35% |
| Tuesday | 62°F | Slight Chance Rain Showers then Partly Sunny | 10 mph ENE | 24% |
| Tuesday Night | 46°F | Mostly Clear | 5 to 8 mph ENE | 3% |
| Wednesday | 66°F | Sunny | 7 mph ENE | 1% |
| Wednesday Night | 50°F | Partly Cloudy | 6 mph ENE | 3% |
| Thursday | 67°F | Mostly Sunny | 6 mph E | 8% |
| Thursday Night | 53°F | Partly Cloudy | 3 mph E | 6% |
| Friday | 70°F | Mostly Sunny | 6 mph E | 5% |
| Friday Night | 54°F | Partly Cloudy | 5 mph ESE | 7% |
Forecast source: National Weather Service (api.weather.gov) for La Porte City (42.314, -92.191). Updated through the day.
Growing snapshot for La Porte City
Last spring frost
May 3
First fall frost
Oct 3
Growing season
151 days
Hardiness zone
5a
More local growing data for La Porte City: nearby ZIP 50651 weather · frost dates · planting calendar · Iowa frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Vinton, Ia (14.6 mi from La Porte City). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.