St. Lucas, IA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for St. Lucas, a city in Fayette County, Iowa.
Today
71°F
Showers And Thunderstorms
Showers and thunderstorms. Cloudy. High near 71, with temperatures falling to around 69 in the afternoon. Southwest wind around 6 mph. Chance of precipitation is 80%. New rainfall amounts between a half and three quarters of an inch possible.
7-day forecast for St. Lucas
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 71°F | Showers And Thunderstorms | 6 mph SW | 80% |
| Tonight | 57°F | Showers And Thunderstorms Likely | 7 to 13 mph N | 59% |
| Sunday | 64°F | Slight Chance Rain Showers then Cloudy | 13 to 16 mph NE | 23% |
| Sunday Night | 51°F | Mostly Cloudy then Slight Chance Rain Showers | 13 mph NE | 24% |
| Monday | 61°F | Chance Rain Showers | 14 mph NE | 26% |
| Monday Night | 45°F | Slight Chance Rain Showers then Mostly Cloudy | 7 to 10 mph NE | 24% |
| Tuesday | 60°F | Mostly Sunny | 9 mph NE | 13% |
| Tuesday Night | 42°F | Mostly Clear | 5 mph NE | 2% |
| Wednesday | 64°F | Sunny | 6 mph E | 1% |
| Wednesday Night | 47°F | Mostly Clear | 2 mph E | 3% |
| Thursday | 65°F | Mostly Sunny | 3 mph E | 13% |
| Thursday Night | 50°F | Partly Cloudy | 2 mph E | 3% |
| Friday | 68°F | Mostly Sunny | 5 mph E | 5% |
| Friday Night | 51°F | Partly Cloudy | 3 mph SE | 7% |
Forecast source: National Weather Service (api.weather.gov) for St. Lucas (43.066, -91.934). Updated through the day.
Growing snapshot for St. Lucas
Last spring frost
May 4
First fall frost
Oct 4
Growing season
151 days
Hardiness zone
5a
More local growing data for St. Lucas: nearby ZIP 52166 weather · frost dates · planting calendar · Iowa frost dates
Nearby towns & communities
Arlington
Clermont
Elgin
Fayette
Hawkeye
Jackson Junction
Maynard
Oelwein
Randalia
Stanley
Wadena
Waucoma
West Union
Westgate
Climate data from the nearest NOAA station, Fayette, Ia (13.9 mi from St. Lucas). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.