Lamoni, IA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Lamoni, a city in Decatur County, Iowa.
Today
87°F
Mostly Sunny then Slight Chance Showers And Thunderstorms
A slight chance of showers and thunderstorms after 5pm. Mostly sunny. High near 87, with temperatures falling to around 85 in the afternoon. South wind around 6 mph. Chance of precipitation is 20%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast for Lamoni
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 87°F | Mostly Sunny then Slight Chance Showers And Thunderstorms | 6 mph S | 18% |
| Tonight | 65°F | Showers And Thunderstorms Likely | 6 to 10 mph NNE | 56% |
| Wednesday | 75°F | Showers And Thunderstorms Likely | 9 mph NE | 85% |
| Wednesday Night | 61°F | Showers And Thunderstorms Likely then Chance Showers And Thunderstorms | 5 to 10 mph NE | 55% |
| Thursday | 81°F | Chance Showers And Thunderstorms then Mostly Sunny | 5 mph ENE | 38% |
| Thursday Night | 63°F | Mostly Clear | 3 mph ESE | 4% |
| Friday | 85°F | Mostly Sunny | 3 to 7 mph S | 6% |
| Friday Night | 67°F | Mostly Clear | 6 mph S | 11% |
| Saturday | 89°F | Sunny | 5 to 12 mph S | 4% |
| Saturday Night | 72°F | Mostly Clear | 13 mph S | 8% |
| Sunday | 91°F | Sunny | 10 to 15 mph SSW | 8% |
| Sunday Night | 72°F | Partly Cloudy | 14 mph S | 11% |
| Monday | 92°F | Mostly Sunny | 12 to 16 mph SSW | 11% |
| Monday Night | 73°F | Partly Cloudy then Slight Chance Showers And Thunderstorms | 12 to 15 mph SSW | 22% |
Forecast source: National Weather Service (api.weather.gov) for Lamoni (40.620, -93.930). Updated through the day.
Growing snapshot for Lamoni
Last spring frost
Apr 16
First fall frost
Oct 20
Growing season
187 days
Hardiness zone
5b
More local growing data for Lamoni: nearby ZIP 50140 weather · frost dates · planting calendar · Iowa frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Lamoni, Ia (1.1 mi from Lamoni). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.