St. Lucas, IA Weather & Growing Conditions
Today
74°F
Chance Showers And Thunderstorms
Scattered rain showers between 11am and 3pm, then a chance of showers and thunderstorms. Mostly cloudy. High near 74, with temperatures falling to around 71 in the afternoon. West wind around 9 mph. Chance of precipitation is 60%. New rainfall amounts between a tenth and quarter of an inch possible.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 74°F | Chance Showers And Thunderstorms | 9 mph W | 57% |
| Tonight | 60°F | Chance Showers And Thunderstorms then Scattered Showers And Thunderstorms | 6 mph NW | 64% |
| Wednesday | 73°F | Slight Chance Rain Showers then Partly Sunny | 5 mph N | 16% |
| Wednesday Night | 54°F | Mostly Clear | 3 mph NW | 2% |
| Thursday | 77°F | Sunny | 3 mph SE | 1% |
| Thursday Night | 59°F | Mostly Clear | 3 mph S | 1% |
| Friday | 80°F | Sunny | 3 to 10 mph S | 6% |
| Friday Night | 63°F | Mostly Clear | 7 mph S | 10% |
| Saturday | 81°F | Mostly Sunny | 6 to 9 mph S | 9% |
| Saturday Night | 67°F | Chance Rain Showers | 7 to 10 mph S | 32% |
| Sunday | 83°F | Chance Showers And Thunderstorms | 10 mph S | 32% |
| Sunday Night | 66°F | Slight Chance Showers And Thunderstorms | 8 mph S | 39% |
| Monday | 81°F | Chance Showers And Thunderstorms | 7 to 10 mph S | 39% |
| Monday Night | 66°F | Chance Showers And Thunderstorms | 9 mph NE | 36% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for St. Lucas, IA
Last spring frost
May 4
First fall frost
Oct 4
Growing season
151 days
Hardiness zone
5a
Explore more for St. Lucas, IA: full frost dates · planting calendar · Iowa frost dates
Climate data from the nearest NOAA station, Fayette, Ia (13.9 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.