Harpers Ferry, IA Weather & Growing Conditions
Today
56°F
Slight Chance Rain Showers then Mostly Cloudy
A slight chance of rain showers between 7am and 9am. Mostly cloudy. High near 56, with temperatures falling to around 53 in the afternoon. Southwest wind around 13 mph, with gusts as high as 24 mph. Chance of precipitation is 20%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 56°F | Slight Chance Rain Showers then Mostly Cloudy | 13 mph SW | 21% |
| Tonight | 44°F | Rain Showers Likely | 12 mph W | 57% |
| Thursday | 53°F | Chance Rain Showers then Cloudy | 9 to 13 mph NW | 27% |
| Thursday Night | 37°F | Mostly Cloudy then Slight Chance Rain Showers | 5 to 9 mph N | 16% |
| Friday | 49°F | Mostly Sunny | 5 mph N | 0% |
| Friday Night | 29°F | Mostly Clear | 1 mph N | 0% |
| Saturday | 51°F | Sunny | 0 to 3 mph W | 0% |
| Saturday Night | 34°F | Mostly Clear | 1 mph W | 2% |
| Sunday | 57°F | Sunny | 1 to 6 mph W | 4% |
| Sunday Night | 35°F | Mostly Clear | 2 mph SW | 0% |
| Monday | 61°F | Sunny | 1 to 7 mph SW | 0% |
| Monday Night | 39°F | Mostly Clear | 3 mph W | 0% |
| Tuesday | 60°F | Mostly Sunny | 2 mph NW | 0% |
| Tuesday Night | 38°F | Partly Cloudy | 0 mph | 2% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Harpers Ferry, IA
Last spring frost
Apr 24
First fall frost
Oct 17
Growing season
175 days
Hardiness zone
5a
Explore more for Harpers Ferry, IA: full frost dates · planting calendar · Iowa frost dates
Climate data from the nearest NOAA station, Lynxville Dam 9, Wi (5.9 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.