St. Lucas, IA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for St. Lucas, a city in Fayette County, Iowa.
Overnight
50°F
Chance Rain Showers
A chance of rain showers. Mostly cloudy. Low around 50, with temperatures rising to around 53 overnight. Southwest wind around 9 mph. Chance of precipitation is 40%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast for St. Lucas
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 50°F | Chance Rain Showers | 9 mph SW | 43% |
| Wednesday | 53°F | Rain Showers Likely | 10 to 16 mph SW | 73% |
| Wednesday Night | 44°F | Rain Showers Likely | 12 to 15 mph W | 57% |
| Thursday | 51°F | Rain Showers Likely | 14 mph NW | 56% |
| Thursday Night | 36°F | Mostly Cloudy | 7 to 12 mph N | 12% |
| Friday | 46°F | Mostly Sunny | 2 to 8 mph N | 0% |
| Friday Night | 28°F | Mostly Clear | 1 mph N | 0% |
| Saturday | 49°F | Sunny | 0 to 5 mph W | 0% |
| Saturday Night | 34°F | Mostly Clear | 5 mph W | 1% |
| Sunday | 55°F | Sunny | 7 mph W | 3% |
| Sunday Night | 36°F | Mostly Clear | 5 mph SW | 0% |
| Monday | 59°F | Sunny | 5 to 10 mph SW | 0% |
| Monday Night | 40°F | Mostly Clear | 6 mph W | 0% |
| Tuesday | 58°F | Sunny | 3 mph NW | 0% |
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 Nov 4, 2026.