Harpers Ferry, IA Weather & Growing Conditions
Today
70°F
Showers And Thunderstorms
Showers and thunderstorms. Cloudy. High near 70, with temperatures falling to around 68 in the afternoon. Southeast wind around 3 mph. Chance of precipitation is 80%. New rainfall amounts between three quarters and one inch possible.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 70°F | Showers And Thunderstorms | 3 mph SE | 84% |
| Tonight | 57°F | Showers And Thunderstorms Likely | 6 mph N | 73% |
| Sunday | 65°F | Chance Rain Showers then Mostly Cloudy | 6 to 9 mph NE | 34% |
| Sunday Night | 51°F | Mostly Cloudy | 6 to 9 mph NE | 14% |
| Monday | 64°F | Slight Chance Rain Showers | 8 mph NE | 20% |
| Monday Night | 46°F | Mostly Cloudy | 2 to 7 mph NE | 12% |
| Tuesday | 63°F | Mostly Sunny | 2 to 6 mph NE | 12% |
| Tuesday Night | 43°F | Mostly Clear | 0 to 5 mph NE | 2% |
| Wednesday | 67°F | Sunny | 1 to 5 mph NE | 1% |
| Wednesday Night | 48°F | Mostly Clear | 2 mph NE | 3% |
| Thursday | 68°F | Mostly Sunny | 0 to 3 mph NE | 6% |
| Thursday Night | 50°F | Partly Cloudy | 1 mph NE | 3% |
| Friday | 71°F | Mostly Sunny | 0 to 3 mph E | 4% |
| Friday Night | 50°F | Partly Cloudy | 1 mph NE | 3% |
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 Sep 19, 2026.