Calmar, IA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Calmar, a city in Winneshiek County, Iowa.
Today
74°F
Slight Chance Showers And Thunderstorms then Chance Showers And Thunderstorms
A slight chance of showers and thunderstorms before 8am, then a chance of showers and thunderstorms. Mostly cloudy. High near 74, with temperatures falling to around 72 in the afternoon. West wind 6 to 9 mph. Chance of precipitation is 50%. New rainfall amounts between a tenth and quarter of an inch possible.
7-day forecast for Calmar
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 74°F | Slight Chance Showers And Thunderstorms then Chance Showers And Thunderstorms | 6 to 9 mph W | 45% |
| Tonight | 59°F | Showers And Thunderstorms Likely | 5 mph NW | 71% |
| Wednesday | 73°F | Slight Chance Rain Showers then Partly Sunny | 5 mph N | 15% |
| Wednesday Night | 54°F | Mostly Clear | 3 mph NW | 1% |
| Thursday | 77°F | Sunny | 2 mph S | 0% |
| Thursday Night | 59°F | Mostly Clear | 3 mph S | 1% |
| Friday | 80°F | Sunny | 3 to 9 mph S | 6% |
| Friday Night | 63°F | Mostly Clear | 7 mph S | 10% |
| Saturday | 82°F | Mostly Sunny | 5 to 8 mph S | 9% |
| Saturday Night | 67°F | Chance Rain Showers | 6 to 9 mph S | 32% |
| Sunday | 83°F | Chance Showers And Thunderstorms | 9 mph S | 32% |
| Sunday Night | 66°F | Slight Chance Showers And Thunderstorms | 7 mph S | 40% |
| Monday | 81°F | Chance Showers And Thunderstorms | 6 to 9 mph S | 40% |
| Monday Night | 66°F | Chance Showers And Thunderstorms | 8 mph NE | 35% |
Forecast source: National Weather Service (api.weather.gov) for Calmar (43.181, -91.868). Updated through the day.
Growing snapshot for Calmar
Last spring frost
May 3
First fall frost
Oct 7
Growing season
157 days
Hardiness zone
5a
More local growing data for Calmar: nearby ZIP 52132 weather · frost dates · planting calendar · Iowa frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Decorah, Ia (9.3 mi from Calmar). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.