Harman US

Washington, IA Weather & Growing Conditions

This Afternoon
83°F
Chance Showers And Thunderstorms
A chance of showers and thunderstorms before 4pm, then a chance of showers and thunderstorms. Mostly cloudy, with a high near 83. Southwest wind around 10 mph. Chance of precipitation is 30%.

7-day forecast

WhenTempForecastWindPrecip
This Afternoon 83°F Chance Showers And Thunderstorms 10 mph SW 33%
Tonight 64°F Chance Showers And Thunderstorms then Showers And Thunderstorms 5 to 10 mph NW 88%
Sunday 70°F Showers And Thunderstorms Likely 10 to 15 mph NE 70%
Sunday Night 58°F Showers And Thunderstorms Likely 15 mph NE 62%
Monday 63°F Showers And Thunderstorms Likely 15 mph NE 62%
Monday Night 52°F Chance Rain Showers 10 to 15 mph NE 47%
Tuesday 61°F Chance Rain Showers 10 to 15 mph NE 36%
Tuesday Night 47°F Partly Cloudy 5 to 10 mph NE 5%
Wednesday 66°F Mostly Sunny 5 to 10 mph NE 0%
Wednesday Night 51°F Partly Cloudy 5 mph NE 2%
Thursday 68°F Partly Sunny 5 mph NE 6%
Thursday Night 55°F Mostly Cloudy 5 mph NE 6%
Friday 71°F Mostly Sunny 5 mph E 6%
Friday Night 55°F Partly Cloudy 5 mph E 8%

Forecast source: National Weather Service (api.weather.gov). Updated through the day.

Growing snapshot for Washington, IA

Last spring frost
Apr 28
First fall frost
Oct 11
Growing season
165 days
Hardiness zone
5b

Explore more for Washington, IA: full frost dates · planting calendar · Iowa frost dates

Climate data from the nearest NOAA station, Washington, Ia (1.2 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.