Washburn, IA Weather & Growing Conditions

Local forecast, frost dates, hardiness zone and planting guidance for Washburn, a community in Black Hawk County, Iowa.

Overnight

65°F

Patchy Fog

Patchy fog and showers and thunderstorms likely. Cloudy. Low around 65, with temperatures rising to around 67 overnight. Southeast wind around 9 mph. Chance of precipitation is 60%. New rainfall amounts between a half and three quarters of an inch possible.

7-day forecast for Washburn

When	Temp	Forecast	Wind	Precip
Overnight	65°F	Patchy Fog	9 mph SE	58%
Saturday	79°F	Showers And Thunderstorms Likely	9 mph SSW	71%
Saturday Night	60°F	Chance Showers And Thunderstorms	10 mph N	41%
Sunday	66°F	Chance Rain Showers then Chance Drizzle	12 to 15 mph NE	37%
Sunday Night	54°F	Chance Rain Showers	14 mph ENE	40%
Monday	63°F	Chance Rain Showers	14 mph ENE	40%
Monday Night	49°F	Chance Rain Showers	9 to 13 mph NE	40%
Tuesday	61°F	Slight Chance Rain Showers then Partly Sunny	10 mph ENE	21%
Tuesday Night	45°F	Mostly Clear	5 to 8 mph ENE	3%
Wednesday	66°F	Sunny	7 mph ENE	1%
Wednesday Night	50°F	Partly Cloudy	2 to 6 mph ENE	3%
Thursday	67°F	Mostly Sunny	6 mph E	8%
Thursday Night	53°F	Partly Cloudy	5 mph E	6%
Friday	69°F	Mostly Sunny	2 to 6 mph ESE	5%

Forecast source: National Weather Service (api.weather.gov) for Washburn (42.410, -92.267). Updated through the day.

Growing snapshot for Washburn

Last spring frost

Apr 27

First fall frost

Oct 10

Growing season

165 days

Hardiness zone

More local growing data for Washburn: nearby ZIP 50634 weather · frost dates · planting calendar · Iowa frost dates

Nearby towns & communities

Cedar Falls Dunkerton Elk Run Heights Evansdale Gilbertville Hudson Jesup La Porte City Raymond Waterloo

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Climate data from the nearest NOAA station, Waterloo Muni Ap, Ia (13.4 mi from Washburn). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.