Harman US

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
70°F
Showers And Thunderstorms
Showers and thunderstorms. Cloudy. High near 70, with temperatures falling to around 67 in the afternoon. Southeast wind around 3 mph. Chance of precipitation is 90%. New rainfall amounts between three quarters and one inch possible.

7-day forecast for Harpers Ferry

WhenTempForecastWindPrecip
Today 70°F Showers And Thunderstorms 3 mph SE 85%
Tonight 57°F Showers And Thunderstorms Likely 5 mph N 73%
Sunday 66°F Chance Rain Showers then Mostly Cloudy 6 to 9 mph NE 34%
Sunday Night 51°F Mostly Cloudy 8 mph NE 14%
Monday 65°F Slight Chance Rain Showers 5 to 8 mph NE 19%
Monday Night 46°F Mostly Cloudy 2 to 7 mph NE 11%
Tuesday 64°F Mostly Sunny 2 to 6 mph NE 11%
Tuesday Night 44°F Partly Cloudy 0 to 3 mph NE 2%
Wednesday 68°F Sunny 3 mph NE 1%
Wednesday Night 48°F Mostly Clear 2 mph NE 3%
Thursday 69°F Mostly Sunny 2 mph NE 6%
Thursday Night 50°F Partly Cloudy 1 mph NE 2%
Friday 72°F Mostly Sunny 2 mph E 3%
Friday Night 51°F Partly Cloudy 1 mph NE 3%

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

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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 Sep 19, 2026.