Washington, IA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Washington, a city in Washington County, Iowa.
Today
83°F
Patchy Fog
Patchy fog and occasional showers and thunderstorms before 1pm, then a chance of showers and thunderstorms between 1pm and 4pm, then a chance of showers and thunderstorms. Mostly cloudy, with a high near 83. South wind 5 to 10 mph. Chance of precipitation is 80%.
7-day forecast for Washington
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 83°F | Patchy Fog | 5 to 10 mph S | 75% |
| 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 | 35% |
| 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 | 5% |
| Friday | 71°F | Mostly Sunny | 5 to 10 mph E | 6% |
| Friday Night | 55°F | Partly Cloudy | 5 mph E | 8% |
Forecast source: National Weather Service (api.weather.gov) for Washington (41.298, -91.694). Updated through the day.
Growing snapshot for Washington
Last spring frost
Apr 28
First fall frost
Oct 11
Growing season
165 days
Hardiness zone
5b
More local growing data for Washington: nearby ZIP 52353 weather · frost dates · planting calendar · Iowa frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Washington, Ia (1.2 mi from Washington). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.