Harpers Ferry, IA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Harpers Ferry, a city in Allamakee County, Iowa.
Today
80°F
Isolated Rain Showers then Isolated Showers And Thunderstorms
Isolated rain showers between 9am and noon, then isolated showers and thunderstorms. Mostly cloudy. High near 80, with temperatures falling to around 77 in the afternoon. West wind around 6 mph. Chance of precipitation is 20%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast for Harpers Ferry
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 80°F | Isolated Rain Showers then Isolated Showers And Thunderstorms | 6 mph W | 23% |
| Tonight | 61°F | Scattered Showers And Thunderstorms | 0 to 3 mph NW | 62% |
| Wednesday | 77°F | Slight Chance Rain Showers then Partly Sunny | 2 mph NW | 16% |
| Wednesday Night | 55°F | Partly Cloudy | 2 mph NW | 3% |
| Thursday | 82°F | Sunny | 1 mph S | 2% |
| Thursday Night | 58°F | Mostly Clear | 0 mph | 0% |
| Friday | 84°F | Sunny | 0 to 5 mph S | 4% |
| Friday Night | 63°F | Mostly Clear | 1 to 5 mph S | 13% |
| Saturday | 86°F | Mostly Sunny | 1 to 5 mph SW | 12% |
| Saturday Night | 68°F | Partly Cloudy then Chance Showers And Thunderstorms | 5 mph S | 37% |
| Sunday | 87°F | Chance Showers And Thunderstorms | 2 to 7 mph SW | 37% |
| Sunday Night | 66°F | Chance Showers And Thunderstorms | 1 to 5 mph SE | 44% |
| Monday | 85°F | Chance Rain Showers | 5 mph S | 44% |
| Monday Night | 67°F | Slight Chance Showers And Thunderstorms | 1 to 5 mph N | 33% |
Forecast source: National Weather Service (api.weather.gov) for Harpers Ferry (43.201, -91.152). Updated through the day.
Growing snapshot for Harpers Ferry
Last spring frost
Apr 24
First fall frost
Oct 17
Growing season
175 days
Hardiness zone
5a
More local growing data for Harpers Ferry: nearby ZIP 52146 weather · frost dates · planting calendar · Iowa frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Lynxville Dam 9, Wi (5.9 mi from Harpers Ferry). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.