Washington, IA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Washington, a city in Washington County, Iowa.
Tonight
49°F
Slight Chance Rain Showers then Mostly Cloudy
A slight chance of rain showers before 9pm. Mostly cloudy. Low around 49, with temperatures rising to around 53 overnight. South wind 10 to 15 mph, with gusts as high as 25 mph. Chance of precipitation is 20%.
7-day forecast for Washington
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 49°F | Slight Chance Rain Showers then Mostly Cloudy | 10 to 15 mph S | 21% |
| Wednesday | 53°F | Slight Chance Rain Showers | 15 mph SW | 22% |
| Wednesday Night | 44°F | Mostly Cloudy | 10 to 15 mph SW | 9% |
| Thursday | 53°F | Chance Rain Showers | 10 to 15 mph W | 32% |
| Thursday Night | 42°F | Chance Rain Showers then Mostly Cloudy | 10 mph NW | 35% |
| Friday | 51°F | Partly Sunny | 5 to 10 mph N | 11% |
| Friday Night | 35°F | Partly Cloudy | 0 to 5 mph NW | 0% |
| Saturday | 53°F | Partly Sunny | 0 to 5 mph W | 2% |
| Saturday Night | 36°F | Mostly Clear | 0 to 5 mph W | 3% |
| Sunday | 58°F | Sunny | 5 to 10 mph W | 8% |
| Sunday Night | 37°F | Mostly Clear | 5 mph W | 3% |
| Monday | 63°F | Sunny | 5 to 10 mph SW | 1% |
| Monday Night | 41°F | Mostly Clear | 5 to 10 mph W | 0% |
| Tuesday | 63°F | Sunny | 5 mph NW | 0% |
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 Nov 4, 2026.