Washington, IA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Washington, a city in Washington County, Iowa.
Today
87°F
Mostly Sunny then Chance Showers And Thunderstorms
A chance of showers and thunderstorms after 4pm. Mostly sunny. High near 87, with temperatures falling to around 84 in the afternoon. Southwest wind 5 to 10 mph. Chance of precipitation is 30%.
7-day forecast for Washington
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 87°F | Mostly Sunny then Chance Showers And Thunderstorms | 5 to 10 mph SW | 30% |
| Tonight | 66°F | Showers And Thunderstorms Likely | 5 to 10 mph N | 71% |
| Wednesday | 78°F | Showers And Thunderstorms then Showers And Thunderstorms Likely | 5 mph NE | 81% |
| Wednesday Night | 61°F | Showers And Thunderstorms Likely | 5 to 10 mph N | 62% |
| Thursday | 81°F | Chance Rain Showers then Mostly Sunny | 5 mph NE | 40% |
| Thursday Night | 61°F | Mostly Clear | 0 to 5 mph E | 4% |
| Friday | 83°F | Sunny | 0 to 5 mph SE | 4% |
| Friday Night | 66°F | Mostly Clear | 5 mph SE | 13% |
| Saturday | 87°F | Sunny | 5 to 10 mph S | 12% |
| Saturday Night | 71°F | Mostly Clear | 10 to 15 mph S | 10% |
| Sunday | 88°F | Mostly Sunny | 10 to 15 mph S | 10% |
| Sunday Night | 70°F | Slight Chance Showers And Thunderstorms | 10 to 15 mph S | 29% |
| Monday | 88°F | Chance Showers And Thunderstorms then Slight Chance Showers And Thunderstorms | 10 to 15 mph S | 29% |
| Monday Night | 71°F | Slight Chance Showers And Thunderstorms | 10 to 15 mph S | 31% |
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 Aug 4, 2026.